Question 1

A sample of 600 values produced the following summary statistics:   Based on this information, upper fence on a box and whisker plot is:

Accepted Answer

A)  26.80 
B)  -4.60 
C)  75.80 
D)  102.60 
E)  62.4 
A)  26.80 
B)  -4.60 
C)  75.80 
D)  102.60 
E)  62.4

Question 2

The left and right ends of the box in a box and whisker plot represent the 25th and 75th percentiles, respectively.

Accepted Answer

A) True 
 B)False

Question 3

If a store manager selected a sample of customers and computed the mean income for this sample, he has computed:

Accepted Answer

A)  a parameter 
B)  a statistic 
C)  a qualitative value 
D)  all of these 
E)  none of these 
A)  a parameter 
B)  a statistic 
C)  a qualitative value 
D)  all of these 
E)  none of these

Question 4

Twenty-eight applicants interested in working for the Food Stamp program took an examination designed to measure their aptitude for social work. A stem-and-leaf plot of the 28 scores appears below, where the first column is the count per branch, the second column is the stem value, and the remaining digits are the leaves.   
a. What is the median score?
______________
b. What is the sample mean for this data set?
______________
c. What is the value of the sample standard deviation?
______________
d. What is the range of this data?
______________

Accepted Answer

84.5; 80.6

Question 5

If the sample mean is much larger than the sample median, the data set is said to be skewed to the right.

Accepted Answer

A) True 
 B)False

Question 6

Consider the following set of measurements: 6, 3, 5, 14, 2, 6, 0, and 8.
a. Find the 25th percentile:
______________,
Find the 50th percentile:
______________,
Find the 75th percentile:
______________.
b. What is the value of the interquartile range?
______________

Accepted Answer

2.25; 5.5;

Question 7

The mean of forty sales receipts is $69.75 and the standard deviation is $10.25. Using Tchebysheff's Theorem, at least 75% of the sales receipts were between $49.25 and $90.25.

Accepted Answer

A) True 
 B)False

Question 8

For larger sample sizes, a rough approximation for the sample standard deviation s is that s $\approx$  R / 4, where R is the range.

Accepted Answer

A) True 
 B)False

Question 9

The standard deviation is the positive square root of the variance.

Accepted Answer

A) True 
 B)False

Question 10

The distribution of checking account balances for customers at Independent Bank is known to be bell - shaped with a mean of $1,800 and a standard deviation of $300. Given this information, the percentage of accounts with balances between $1,500 and $2,100 will be approximately 95%.

Accepted Answer

A) True 
 B)False

Question 11

In a histogram, the proportion of the total area which must be to the left of the median is more than 0.50 if the distribution is skewed to the right.

Accepted Answer

A) True 
 B)False

Question 12

The mean is one of the most frequently used measures of variability.

Accepted Answer

A) True 
 B)False

Question 13

Which of the following best describes measures of center?

Accepted Answer

A)  They are numbers around which observations tend to cluster and that describe the location of what in some sense might be called the center of a data set. 
B)  They are numbers that indicate the spread or scatter of observations and show the extent to which individual values in a data set differ from one another and, hence, differ from their central location. 
C)  They are numbers that indicate the degree of asymmetry in a frequency distribution. 
D)  None of these. 
E)  All of these. 
A)  They are numbers around which observations tend to cluster and that describe the location of what in some sense might be called the center of a data set. 
B)  They are numbers that indicate the spread or scatter of observations and show the extent to which individual values in a data set differ from one another and, hence, differ from their central location. 
C)  They are numbers that indicate the degree of asymmetry in a frequency distribution. 
D)  None of these. 
E)  All of these.

Question 14

The distribution of a set of data is considered to be symmetric if the first quartile and the 25th percentile are equal.

Accepted Answer

A) True 
 B)False

Question 15

Which of the following summary measures is affected most by outliers?

Accepted Answer

A)  the first quartile 
B)  the second quartile 
C)  the third quartile 
D)  the fourth quartile 
E)  none of these 
A)  the first quartile 
B)  the second quartile 
C)  the third quartile 
D)  the fourth quartile 
E)  none of these

Question 16

The value (n + 1) / 2 indicates the value of the median in an ordered data set, where n is the number of data values.

Accepted Answer

A) True 
 B)False

Question 17

Tchebysheff's Theorem provides us with a measure of shape that focuses on the difference between the mode and the mean and then relates it to the standard deviation.

Accepted Answer

A) True 
 B)False

Question 18

For any distribution, if the mean is equal to the standard deviation, you can infer that the distribution is symmetric.

Accepted Answer

A) True 
 B)False

Question 19

Suppose the hourly dollar amount of food sold by a Burger King franchise follows an approximately mound-shaped distribution with a mean sales level of $400 per hour and a standard deviation of $60 per hour.
a. What percentage of the working hours does this Burger King franchise sell between $280 and $520 worth of food per hour?
______________
b. Suppose yesterday, during a one-hour period, this Burger King franchise had sales at the 84th percentile. What dollar sales figure does this represent?
______________

Accepted Answer

The answer of Suppose the hourly dollar amount of food...

Question 20

Numerical descriptive measures computed from population measurements are called parameters.

Accepted Answer

A) True 
 B)False

A sample of 600 values produced the following summary statistics: Based on this information, upper fence on a box and whisker plot is:

The left and right ends of the box in a box and whisker plot represent the 25^th and 75^th percentiles, respectively.

If a store manager selected a sample of customers and computed the mean income for this sample, he has computed:

If the sample mean is much larger than the sample median, the data set is said to be skewed to the right.

Consider the following set of measurements: 6, 3, 5, 14, 2, 6, 0, and 8. a. Find the 25^th percentile: , Find the 50^th percentile: , Find the 75^th percentile: . b. What is the value of the interquartile range?

The mean of forty sales receipts is $69.75 and the standard deviation is $10.25. Using Tchebysheff's Theorem, at least 75% of the sales receipts were between $49.25 and $90.25.

For larger sample sizes, a rough approximation for the sample standard deviation s is that s $\approx$ R / 4, where R is the range.

The standard deviation is the positive square root of the variance.

The distribution of checking account balances for customers at Independent Bank is known to be bell - shaped with a mean of $1,800 and a standard deviation of $300. Given this information, the percentage of accounts with balances between $1,500 and $2,100 will be approximately 95%.

In a histogram, the proportion of the total area which must be to the left of the median is more than 0.50 if the distribution is skewed to the right.

The mean is one of the most frequently used measures of variability.

Which of the following best describes measures of center?

The distribution of a set of data is considered to be symmetric if the first quartile and the 25^th percentile are equal.

Which of the following summary measures is affected most by outliers?

The value (n + 1) / 2 indicates the value of the median in an ordered data set, where n is the number of data values.

Tchebysheff's Theorem provides us with a measure of shape that focuses on the difference between the mode and the mean and then relates it to the standard deviation.

For any distribution, if the mean is equal to the standard deviation, you can infer that the distribution is symmetric.

Numerical descriptive measures computed from population measurements are called parameters.

Describing Data With Graphs

Describing Bivariate Data

Probability and Probability Distributions

Several Useful Discrete Distributions

The Normal Probability Distribution

Sampling Distributions

Large-Sample Estimation

Large-Sample Tests of Hypotheses

Inference From Small Samples

The Analysis of Variance

Linear Regression and Correlation

Multiple Regression Analysis

Analysis of Categorical Data

Nonparametric Statistics

Filters

Exam 2: Describing Data With Numerical Measures

A sample of 600 values produced the following summary statistics: Based on this information, upper fence on a box and whisker plot is:

The left and right ends of the box in a box and whisker plot represent the 25th and 75th percentiles, respectively.

If a store manager selected a sample of customers and computed the mean income for this sample, he has computed:

If the sample mean is much larger than the sample median, the data set is said to be skewed to the right.

Consider the following set of measurements: 6, 3, 5, 14, 2, 6, 0, and 8. a. Find the 25th percentile: ______________, Find the 50th percentile: ______________, Find the 75th percentile: ______________. b. What is the value of the interquartile range? ______________

The mean of forty sales receipts is $69.75 and the standard deviation is $10.25. Using Tchebysheff's Theorem, at least 75% of the sales receipts were between $49.25 and $90.25.

For larger sample sizes, a rough approximation for the sample standard deviation s is that s ≈\approx≈ R / 4, where R is the range.

The standard deviation is the positive square root of the variance.

The distribution of checking account balances for customers at Independent Bank is known to be bell - shaped with a mean of $1,800 and a standard deviation of $300. Given this information, the percentage of accounts with balances between $1,500 and $2,100 will be approximately 95%.

In a histogram, the proportion of the total area which must be to the left of the median is more than 0.50 if the distribution is skewed to the right.

The mean is one of the most frequently used measures of variability.

Which of the following best describes measures of center?

The distribution of a set of data is considered to be symmetric if the first quartile and the 25th percentile are equal.

Which of the following summary measures is affected most by outliers?

The value (n + 1) / 2 indicates the value of the median in an ordered data set, where n is the number of data values.

Tchebysheff's Theorem provides us with a measure of shape that focuses on the difference between the mode and the mean and then relates it to the standard deviation.

For any distribution, if the mean is equal to the standard deviation, you can infer that the distribution is symmetric.

Numerical descriptive measures computed from population measurements are called parameters.

Describing Data With Graphs

Describing Bivariate Data

Probability and Probability Distributions

Several Useful Discrete Distributions

The Normal Probability Distribution

Sampling Distributions

Large-Sample Estimation

Large-Sample Tests of Hypotheses

Inference From Small Samples

The Analysis of Variance

Linear Regression and Correlation

Multiple Regression Analysis

Analysis of Categorical Data

Nonparametric Statistics

Filters

The left and right ends of the box in a box and whisker plot represent the 25^th and 75^th percentiles, respectively.

Consider the following set of measurements: 6, 3, 5, 14, 2, 6, 0, and 8. a. Find the 25^th percentile: , Find the 50^th percentile: , Find the 75^th percentile: . b. What is the value of the interquartile range?

For larger sample sizes, a rough approximation for the sample standard deviation s is that s $\approx$ R / 4, where R is the range.

The distribution of a set of data is considered to be symmetric if the first quartile and the 25^th percentile are equal.