statistics(浙江财经大学) 中国大学mooc慕课答案2024版 m91714

Chapter 1 Introduction to statistics quizzes1

1、 In a questionnaire, respondents are asked to mark their gender as male or female. Gender is an example of the（ ）

答案: B.nominal scale

2、 The nominal scale of measurement has the properties of the（ ）.

答案: D.None of these alternatives is correct.

3、 The scale of measurement that is used to rank order the observation for a variable is called the（ ）.

答案: B.ordinal scale

4、 The ratio scale of measurement has the properties of（ ）.

答案: D.the interval scale

5、 The interval scale of measurement has the properties of the（ ）.

答案: D.None of these alternatives is correct.

6、 Data obtained from a nominal scale（ ）.

答案: B.can be either numeric or nonnumeric

7、 The scale of measurement that has an inherent zero value defined is the（ ）.

答案: A.ratio scale

8、 Quantitative data refers to data obtained with a(n)（ ）.

答案: C.either interval or ratio scale

9、 The entities on which data are collected are（ ）.

答案: A.elements

10、 The set of measurements collected for a particular element is (are) called（ ）.

答案: B.observations

11、 The weight of a candy bar in ounces is an example of（ ）.

答案: D.quantitative data

12、 The height of a building, measured in feet, is an example of（ ）.

答案: D.quantitative data

13、 Income is an example of（ ）

答案: A.a variable that uses the ratio scale;
D.quantitative data

14、 Since a sample is a subset of the population, the sample mean（ ）.

答案: D.can be larger, smaller, or equal to the mean of the population

15、 In experimental studies, the variable of interest（ ）.

答案: B.is controlled

16、 On a street, the houses are numbered from 300 to 450. The house numbers are examples of（ ）.

答案: A.categorical data

17、 Which of the following can be classified as quantitative data?

答案: A.The height of a building, measured in feet.;
B.The weight of a candy bar in ounces.;
C.Income in dollars.

18、 Which of the following variables use the interval scale of measurement?

答案: B.temperature;
E.latitude

19、 Which scale of measurement can be either numeric or nonnumeric?

答案: A.nominal;
D.ordinal

20、 In a questionnaire, respondents are asked to mark their gender as male or female. Gender is an （ ）.

答案: B.nominal scale;
C.categorical variable

21、 Arithmetic operations are appropriate for（ ）

答案: A.the ratio scale;
B.the interval scale;
D.quantitative data

22、 Quantitative data may be either numeric or nonnumeric.

答案: 错误

23、 In experimental studies, the variable of interest is controlled.

答案: 正确

24、 A portion of the population selected to represent the population is called a census.

答案: 错误

25、 Arithmetic operations are inappropriate for either categorical or quantitative data.

答案: 错误

26、 Ordinary arithmetic operations are meaningful either with quantitative or categorical data.

答案: 错误

27、 Another name for “observations” is cases.

答案: 正确

Chapter 2 Descriptive Statistics：Summarizing data using tabular and graphical techniques quizzes2

1、 A frequency distribution is a tabular summary of data showing the

答案: number of items in several classes

2、 A frequency distribution is

答案: a tabular summary of a set of data showing the frequency of items in each of several nonoverlapping classes

3、 A tabular summary of a set of data showing the fraction of the total number of items in several classes is a

答案: relative frequency distribution

4、 The relative frequency of a class is computed by

答案: dividing the frequency of the class by the sample size

5、 The percent frequency of a class is computed by

答案: multiplying the relative frequency by 100

6、 The sum of frequencies for all classes will always equal

答案: the number of elements in a data set

7、 Fifteen percent of the students in a school of Business Administration are majoring in Economics, 20% in Finance, 35% in Management, and 30% in Accounting. The graphical device(s) which can be used to present these data is (are)

答案: both a bar chart and a pie chart

8、 A cumulative relative frequency distribution shows

答案: the proportion of data items with values less than or equal to the upper limit of each class

9、 The sum of the relative frequencies for all classes will always equal

答案: one

10、 The most common graphical presentation of quantitative data is a

答案: histogram

11、 The sum of the percent frequencies for all classes will always equal

答案: 100

12、 The relative frequency of a class is computed by

答案: dividing the frequency of the class by n

13、 In constructing a frequency distribution, as the number of classes are decreased, the class width

答案: increases

14、 In a cumulative relative frequency distribution, the last class will have a cumulative relative frequency equal to

答案: one

15、 Data that provide labels or names for categories of like items are known as

答案: categorical data

16、 A graphical presentation of the relationship between two variables is

答案: a scatter diagram

17、 In a scatter diagram, a line that provides an approximation of the relationship between the variables is known as

答案: trend line

18、 Which of the following graphical methods shows the relationship between two variables?

答案: crosstabulation

19、  A frequency distribution is

答案: a tabular summary of data showing the number of items in several classes;
a tabular summary of a set of data showing the frequency of items in each of several nonoverlapping classes

20、 1. The relative frequency of a class is computed by

答案: dividing the frequency of the class by the sample size;
dividing the frequency of the class by n

21、  Which of the following statements is correct？

答案: In a cuIn a cumulative percent frequency distribution, the last class will have a cumulative percent frequency equal to 100.;
In a cumulative relative frequency distribution, the last class will have a cumulative relative frequency equal to one.;
In a cumulative frequency distribution, the last class will always have a cumulative frequency equal to the total number of elements in the data set.

22、 Which of the following statements is NOT correct？

答案: A histogram is said to be skewed to the left if it has a shorter tail to the left.;
A graphical presentation of the relationship between two variables is a histogram.;
A histogram is a graphical method of presenting a cumulative frequency or a cumulative relative frequency distribution.

Chapter 3 Descriptive Statistics：Summarizing data using numerical techniques quizzes3

1、 Geometric mean is a measure of 

答案: location

2、 Growth factors for the population of Chattanoonga in the past two years has been 8 and 12.  The geometric mean has a value of 

答案: square root of 96

3、 Geometric mean of five observations is 

答案: fifth root of the product of the 5 observations

4、 The nth root of the product of the n observations is

答案: geometric mean

5、 The measure of location which is the most likely to be influenced by extreme values in the data set is the

答案: mean

6、 If two groups of numbers have the same mean, then

答案: None of these alternatives is correct.

7、 The mean of the sample

答案: None of these alternatives is correct.

8、 When the smallest and largest percentage of items are removed from a data set and the mean is computed, the mean of the remaining data is

答案: the trimmed mean

9、 Since the population is always larger than the sample, the value of the sample mean

答案: could be larger, equal to, or smaller than the true value of the population mean

10、 Which of the following provides a measure of central location for the data?

答案: mean

11、 In computing the mean of a sample, the value of åxi is divided by

答案: n

12、 A numerical value used as a summary measure for a sample, such as sample mean, is known as a

答案: sample statistic

13、 m is an example of a

答案: population parameter

14、 The mean of a sample

答案: is computed by summing all the data values and dividing the sum by the number of items

15、 The coefficient of variation equals

答案: 30%

16、 The median is a measure of

答案: central location

17、 The difference between the largest and the smallest data values is the

答案: range

18、 Which of the following is a measure of dispersion?

答案: interquartile range

19、 The interquartile range is

答案: the difference between the third quartile and the first quartile

20、 The variance of a sample of 81 observations equals 64. The standard deviation of the sample equals

答案: 8

21、 Which of the following don’t provides a measure of central location for the data?

答案: standard median;
variance;
range

22、 Which of the following is a measure of central location?

答案: mean;
median;
mode

23、 Which of the following is a measure of dispersion?

答案: standard deviation;
range;
interquartile range

24、 When the data are skewed to the right, the measure of Skewness will be positive.

答案: 正确

25、 When data are positively skewed, the mean will usually be smaller than the median.

答案: 错误

26、 In computing descriptive statistics from grouped data,data values are treated as if they occur at the midpoint of a class

答案: 正确

27、 The measure of dispersion that is influenced most by extreme values is the interquartile range.

答案: 错误

28、 The descriptive measure of dispersion that is based on the concept of a deviation about the mean is the standard deviation.

答案: 正确

29、 The sample variance could be smaller, equal to, or larger than the true value of the population variance.

答案: 正确

Chapter 4 Probability and Distributions quizzes4

1、 Each individual outcome of an experiment is called

答案: a sample point

2、 A graphical method of representing the sample points of an experiment is

答案: a tree diagram

3、 Any process that generates well-defined outcomes is

答案: an experiment

4、 In statistical experiments, each time the experiment is repeated

答案: a different outcome may occur

5、 The counting rule that is used for counting the number of experimental outcomes when n objects are selected from a set of N objects where order of selection is not important is called

答案: combination

6、 From a group of six people, two individuals are to be selected at random. How many possible selections are possible?

答案: 15

7、 A method of assigning probabilities based upon judgment is referred to as the

答案: subjective method

8、 A graphical device used for enumerating sample points in a multiple-step experiment is a

答案: None of these alternatives is correct.

9、 Two events are mutually exclusive

答案: if they have no sample points in common

10、 Events that have no sample points in common are

答案: mutually exclusive events

11、 Initial estimates of the probabilities of events are known as

答案: prior probabilities

12、 The addition law is potentially helpful when we are interested in computing the probability of

答案: the union of two events

13、 The sum of the probabilities of two complementary events is

答案: 1.0

14、 The set of all possible outcomes of an experiment is

答案: the sample space

15、 If a six sided die is tossed two times and “3” shows up both times, the probability of “3” on the third trial is

答案: 1/6

16、 Given that event E has a probability of 0.31, the probability of the complement of event E

答案: 0.69

17、 Bayes’ theorem is used to compute

答案: the posterior probabilities

18、 The multiplication law is potentially helpful when we are interested in computing the probability of

答案: the intersection of two events

19、 If P(A) = 0.5 and P(B) = 0.5, then P(A Ç B)

答案: None of these alternatives is correct.

20、 A lottery is conducted using three urns. Each urn contains chips numbered from 0 to 9. One chip is selected at random from each urn. The total number of sample points in the sample space is

答案: 1,000

21、 An experiment consists of four outcomes with P(E1) = 0.2, P(E2) = 0.3, and P(E3) = 0.4. The probability of outcome E4 is

答案: 0.100

22、 The set of all possible sample points (experimental outcomes) is called

答案: the sample space

23、  Events A and B are mutually exclusive if their joint probability is zero.

答案: 正确

24、 If two events are mutually exclusive, then their intersection can have any value larger than zero.

答案: 错误

25、 A method of assigning probabilities which assumes that the experimental outcomes are equally likely is referred to as the classical method.

答案: 正确

26、 A method of assigning probabilities based on historical data is called the historical method.

答案: 错误

27、 The probability assigned to each experimental outcome must be between zero and one.

答案: 正确

28、 A measure of the average value of a random variable is called a(n) expected value.

答案: 正确

Chapter 5 Survey Sampling quizzes5

1、 Parameters are

答案: numerical characteristics of a population

2、 A simple random sample of 100 observations was taken from a large population. The sample mean and the standard deviation were determined to be 80 and 12 respectively. The standard error of the mean is

答案: 1.20

3、 A population has a standard deviation of 16. If a sample of size 64 is selected from this population, what is the probability that the sample mean will be within ±2 of the population mean?

答案: 0.6826

4、 Convenience sampling is an example of

答案: nonprobabilistic sampling

5、 Which of the following is an example of nonprobabilistic sampling?

答案: judgment sampling

6、 Stratified random sampling is a method of selecting a sample in which

答案: the population is first divided into strata, and then random samples are drawn from each stratum

7、 A population consists of 500 elements. We want to draw a simple random sample of 50 elements from this population. On the first selection, the probability of an element being selected is

答案: 0.002

8、 As the sample size increases, the

答案: standard error of the mean decreases

9、 If we consider the simple random sampling process as an experiment, the sample mean is

答案: a random variable

10、 As the sample size becomes larger, the sampling distribution of the sample mean approaches a

答案: normal distribution

11、 The standard deviation of a sample of 100 elements taken from a very large population is determined to be 60. The variance of the population

答案: can be any value greater or equal to zero

12、 A probability distribution for all possible values of a sample statistic is known as

答案: a sampling distribution

13、 A population has a mean of 300 and a standard deviation of 18. A sample of 144 observations will be taken. The probability that the sample mean will be between 297 to 303 is

答案: 0.8664

14、 A theorem that allows us to use the normal probability distribution to approximate the sampling distribution of sample means and sample proportions whenever the sample size is large is known as the

答案: central limit theorem

15、 A sample of 400 observations will be taken from an infinite population. The population proportion equals 0.8. The probability that the sample proportion will be greater than 0.83 is

答案: 0.0668

16、 Which of the following is(are) NOT point estimator(s)?

答案: s;
m;
a

17、 Which of the following is an example of probability sampling?

答案: simple random sampling;
stratified simple random sampling;
systematic sampling;
cluster sampling

18、 Which of the following is an example of non probability sampling?

答案: convenience sampling;
judgment sampling

19、 The error that occurs because a sample, and not the entire population, is used to estimate a population parameter is a sampling error.

答案: 正确

20、 Cluster sampling is a non probability sampling method.

答案: 错误

21、 A method of selecting a sample by randomly selecting the first element and then selecting every Kth element thereafter is stratified simple random sampling

答案: 错误

22、 In a sample survey, it is common practice to use a t value of (when approximating a 95% confidence interval)

答案: 错误

23、 A sampling unit must have one element.

答案: 错误

24、 Conclusions drawn from a sample survey apply to any population.

答案: 错误

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