Question 1

Which of the following symbols represents the mean of the sample?

Accepted Answer

A) $\sigma$2 
B) $\sigma$ 
C) $\mu$ 
D) n 
A) $\sigma$2 
B) $\sigma$ 
C) $\mu$ 
D) n

Question 2

If a data set has an even number of observations, the median

Accepted Answer

A) cannot be determined 
B) is the average value of the two middle items 
C) must be equal to the mean 
D) is the average value of the two middle items when all items are arranged in ascending order 
A) cannot be determined 
B) is the average value of the two middle items 
C) must be equal to the mean 
D) is the average value of the two middle items when all items are arranged in ascending order

Question 3

Since the population size is always larger than the sample size, then the sample statistic

Accepted Answer

A) can never be larger than the population parameter 
B) can never be equal to the population parameter 
C) can never be zero 
D) None of the other answers are correct. 
A) can never be larger than the population parameter 
B) can never be equal to the population parameter 
C) can never be zero 
D) None of the other answers are correct.

Question 4

The first quartile

Accepted Answer

A) contains at least one third of the data elements 
B) is the same as the 25th percentile 
C) is the same as the 50th percentile 
D) is the same as the 75th percentile 
A) contains at least one third of the data elements 
B) is the same as the 25th percentile 
C) is the same as the 50th percentile 
D) is the same as the 75th percentile

Question 5

A numerical measure, such as a mean, computed from a population is known as a

Accepted Answer

A) population parameter 
B) sample parameter 
C) sample statistic 
D) sample mean 
A) population parameter 
B) sample parameter 
C) sample statistic 
D) sample mean

Question 6

Generally, which one of the following is the least appropriate measure of central tendency for a data set that contains outliers?

Accepted Answer

A) mean 
B) median 
C) 2nd quartile 
D) 50th percentile 
A) mean 
B) median 
C) 2nd quartile 
D) 50th percentile

Question 7

Given below is a sample of 70 monthly rents for one-bedroom apartments presented as grouped data in the form of a frequency distribution. Compute the sample mean, variance, and standard deviation.

Accepted Answer

Sample mean = 493.21

Question 8

Excel's __________ function can be used to compute the mode.

Accepted Answer

A) MAX 
B) AVERAGE 
C) MEDIAN 
D) MODE 
A) MAX 
B) AVERAGE 
C) MEDIAN 
D) MODE

Question 9

The following frequency distribution shows the time (in minutes) that a sample of students uses the computer terminals per day.   
a.Compute the mean.
b.Compute the variance.
c.Compute the standard deviation.
d.Compute the coefficient of variation.

Accepted Answer

a.69.5
b.5

Question 10

The symbol $\sigma$ 2 is used to represent the

Accepted Answer

A) variance of the population 
B) standard deviation of the sample 
C) standard deviation of the population 
D) None of the other answers are correct. 
A) variance of the population 
B) standard deviation of the sample 
C) standard deviation of the population 
D) None of the other answers are correct.

Question 11

A researcher has obtained the number of hours worked per week during the summer for a sample of fifteen students.   Using this data set, compute the
a. median
b. mean
c. mode
d. 40th percentile
e. range
f. sample variance
g. standard deviation

Accepted Answer

a.25
b.25

Question 12

A sample of twelve families was taken. Each family was asked how many times per week they dine in restaurants. Their responses are given below.   Using this data set, compute the
a. mode
b. median
c. mean
d. range
e. interquartile range
f. variance
g. standard deviation
h. coefficient of variation

Accepted Answer

a.2
b.1.5
c.1.25
d.2

Question 13

Exhibit 3-4
The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway.  
-Refer to Exhibit 3-4. The mean is

Accepted Answer

A) 35 
B) 670 
C) 10 
D) 67 
A) 35 
B) 670 
C) 10 
D) 67

Question 14

The weights (in pounds) of a sample of 36 individuals were recorded and the following statistics were calculated   The coefficient of variation equals

Accepted Answer

A) 0.1125% 
B) 11.25% 
C) 203.12% 
D) 0.20312% 
A) 0.1125% 
B) 11.25% 
C) 203.12% 
D) 0.20312%

Question 15

If the data distribution is symmetric, the skewness is

Accepted Answer

A) 0 
B) .5 
C) 1 
D) None of the other answers is correct. 
A) 0 
B) .5 
C) 1 
D) None of the other answers is correct.

Question 16

Missy Walters owns a mail-order business specializing in baby clothes. She is considering offering her customers a discount on shipping charges based on the dollar-amount of the mail order. Before Missy decides the discount policy, she needs a better understanding of the dollar-amount distribution of the mail orders she receives. Missy had an assistant randomly select 50 recent orders and record the value, to the nearest dollar, of each order as shown below.   
a. Determine the mean, median, and mode for this data set.
b. Determine the 80th percentile.
c. Determine the first quartile.
d. Determine the range and interquartile range.
e. Determine the sample variance, sample standard deviation, and coefficient of variation.
f. Determine the z-scores for the minimum and maximum values in the data set.

Accepted Answer

a. mean = 251.46, median = 228.5, modes

Question 17

Compute the weighted mean for the following data.

Accepted Answer

The answer of Compute the weighted mean for the following...

Question 18

The median of a sample will always equal the

Accepted Answer

A) mode 
B) mean 
C) 50th percentile 
D) all of these answers are correct 
A) mode 
B) mean 
C) 50th percentile 
D) all of these answers are correct

Question 19

Positive values of covariance indicate

Accepted Answer

A) a positive variance of the x values 
B) a positive variance of the y values 
C) the standard deviation is positive 
D) a positive relation between the x and the y variables 
A) a positive variance of the x values 
B) a positive variance of the y values 
C) the standard deviation is positive 
D) a positive relation between the x and the y variables

Question 20

Exhibit 3-2
A researcher has collected the following sample data. The mean of the sample is 5.  
-The __________ denotes the number of standard deviations xi is from the mean   .

Accepted Answer

A) range 
B) median 
C) z-score 
D) third quartile 
A) range 
B) median 
C) z-score 
D) third quartile

Which of the following symbols represents the mean of the sample?

If a data set has an even number of observations, the median

Since the population size is always larger than the sample size, then the sample statistic

The first quartile

A numerical measure, such as a mean, computed from a population is known as a

Generally, which one of the following is the least appropriate measure of central tendency for a data set that contains outliers?

Given below is a sample of 70 monthly rents for one-bedroom apartments presented as grouped data in the form of a frequency distribution. Compute the sample mean, variance, and standard deviation.

Excel's __________ function can be used to compute the mode.

The following frequency distribution shows the time (in minutes) that a sample of students uses the computer terminals per day. a.Compute the mean. b.Compute the variance. c.Compute the standard deviation. d.Compute the coefficient of variation.

The symbol $\sigma$ ² is used to represent the

A researcher has obtained the number of hours worked per week during the summer for a sample of fifteen students. Using this data set, compute the a. median b. mean c. mode d. 40th percentile e. range f. sample variance g. standard deviation

A sample of twelve families was taken. Each family was asked how many times per week they dine in restaurants. Their responses are given below. Using this data set, compute the a. mode b. median c. mean d. range e. interquartile range f. variance g. standard deviation h. coefficient of variation

Exhibit 3-4 The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway. -Refer to Exhibit 3-4. The mean is

The weights (in pounds) of a sample of 36 individuals were recorded and the following statistics were calculated The coefficient of variation equals

If the data distribution is symmetric, the skewness is

Compute the weighted mean for the following data.

The median of a sample will always equal the

Positive values of covariance indicate

Exhibit 3-2 A researcher has collected the following sample data. The mean of the sample is 5. -The __________ denotes the number of standard deviations x_i is from the mean .

Data and Statistics

Descriptive Statistics: Tabular and Graphical Displays

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Hypothesis Tests

Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Tests of Goodness of Fit, Independence and Multiple Proportions

Experimental Design and Analysis of Variance

Simple Linear Regression

Multiple Regression

Regression Analysis: Model Building

Time Series Analysis and Forecasting

Nonparametric Methods

Statistical Methods for Quality Control

Decision Analysis

Sample Survey

Filters

Exam 3: Descriptive Statistics: Numerical Measures

Which of the following symbols represents the mean of the sample?

If a data set has an even number of observations, the median

Since the population size is always larger than the sample size, then the sample statistic

The first quartile

A numerical measure, such as a mean, computed from a population is known as a

Generally, which one of the following is the least appropriate measure of central tendency for a data set that contains outliers?

Given below is a sample of 70 monthly rents for one-bedroom apartments presented as grouped data in the form of a frequency distribution. Compute the sample mean, variance, and standard deviation.

Excel's __________ function can be used to compute the mode.

The following frequency distribution shows the time (in minutes) that a sample of students uses the computer terminals per day. a.Compute the mean. b.Compute the variance. c.Compute the standard deviation. d.Compute the coefficient of variation.

The symbol σ\sigmaσ 2 is used to represent the

A researcher has obtained the number of hours worked per week during the summer for a sample of fifteen students. Using this data set, compute the a. median b. mean c. mode d. 40th percentile e. range f. sample variance g. standard deviation

A sample of twelve families was taken. Each family was asked how many times per week they dine in restaurants. Their responses are given below. Using this data set, compute the a. mode b. median c. mean d. range e. interquartile range f. variance g. standard deviation h. coefficient of variation

Exhibit 3-4 The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway. -Refer to Exhibit 3-4. The mean is

The weights (in pounds) of a sample of 36 individuals were recorded and the following statistics were calculated The coefficient of variation equals

If the data distribution is symmetric, the skewness is

Compute the weighted mean for the following data.

The median of a sample will always equal the

Positive values of covariance indicate

Exhibit 3-2 A researcher has collected the following sample data. The mean of the sample is 5. -The __________ denotes the number of standard deviations xi is from the mean .

Data and Statistics

Descriptive Statistics: Tabular and Graphical Displays

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Hypothesis Tests

Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Tests of Goodness of Fit, Independence and Multiple Proportions

Experimental Design and Analysis of Variance

Simple Linear Regression

Multiple Regression

Regression Analysis: Model Building

Time Series Analysis and Forecasting

Nonparametric Methods

Statistical Methods for Quality Control

Decision Analysis

Sample Survey

Filters

The symbol $\sigma$ ² is used to represent the

Exhibit 3-2 A researcher has collected the following sample data. The mean of the sample is 5. -The __________ denotes the number of standard deviations x_i is from the mean .