Question 1

A population consists of the following data: 7,11,12,18,20,22,25.The population variance is:

Accepted Answer

A)  6.07. 
B)  36.82. 
C)  5.16. 
D)  22.86. 
A)  6.07. 
B)  36.82. 
C)  5.16. 
D)  22.86.

Question 2

Twelve randomly chosen students were asked how many times they had missed class during a certain semester,with this result: 2,1,5,1,1,3,4,3,1,1,5,18.For this sample,the geometric mean is:

Accepted Answer

A)  2.158. 
B)  1.545. 
C)  2.376. 
D)  3.017. 
A)  2.158. 
B)  1.545. 
C)  2.376. 
D)  3.017.

Question 3

Which is a weakness of the mode?

Accepted Answer

A)  It does not apply to qualitative data. 
B)  It is inappropriate for continuous data. 
C)  It is hard to calculate when n is small. 
D)  It is usually about the same as the median. 
A)  It does not apply to qualitative data. 
B)  It is inappropriate for continuous data. 
C)  It is hard to calculate when n is small. 
D)  It is usually about the same as the median.

Question 4

Which is not true of an outlier?

Accepted Answer

A)  It is likely to be from a different population. 
B)  It is suggestive of an error in recording the data. 
C)  It is best discarded to get a better mean. 
D)  It is an anomaly that may tell the researcher something. 
A)  It is likely to be from a different population. 
B)  It is suggestive of an error in recording the data. 
C)  It is best discarded to get a better mean. 
D)  It is an anomaly that may tell the researcher something.

Question 5

Referring to this box plot of ice cream fat content,the median seems more "typical" of fat content than the midrange as a measure of center.

Accepted Answer

A) True 
 B)False

Question 6

Which Excel function would be least useful to calculate the quartiles for a column of data?

Accepted Answer

A)  =STANDARDIZE 
B)  =PERCENTILE.EXC 
C)  =QUARTILE.EXC 
D)  =RANK 
A)  =STANDARDIZE 
B)  =PERCENTILE.EXC 
C)  =QUARTILE.EXC 
D)  =RANK

Question 7

In calculating the sample variance,the sum of the squared deviations around the mean is divided by n - 1 to avoid underestimating the unknown population variance.

Accepted Answer

A) True 
 B)False

Question 8

Referring to this box plot of ice cream fat content,the mean would exceed the median.

Accepted Answer

A) True 
 B)False

Question 9

The sum of the deviations around the mean is always zero.

Accepted Answer

A) True 
 B)False

Question 10

Five homes were recently sold in Oxnard Acres.Four of the homes sold for $400,000 while the fifth home sold for $2.5 million.Which measure of central tendency best represents a typical home price in Oxnard Acres?

Accepted Answer

A)  The mean or median. 
B)  The median or mode. 
C)  The mean or mode. 
D)  The midrange or mean. 
A)  The mean or median. 
B)  The median or mode. 
C)  The mean or mode. 
D)  The midrange or mean.

Question 11

John scored 85 on Prof.Hardtack's exam (Q1 = 40 and Q3 = 60).Based on the fences,which is correct?

Accepted Answer

A)  John is an extreme outlier. 
B)  John is an outlier. 
C)  John is not an outlier. 
D)  John is in the 85th percentile. 
A)  John is an extreme outlier. 
B)  John is an outlier. 
C)  John is not an outlier. 
D)  John is in the 85th percentile.

Question 12

The position of the median is:

Accepted Answer

A)  n/2 in any sample. 
B)  n/2 if n is even. 
C)  n/2 if n is odd. 
D)  (n + 1)/2 in any sample. 
A)  n/2 in any sample. 
B)  n/2 if n is even. 
C)  n/2 if n is odd. 
D)  (n + 1)/2 in any sample.

Question 13

Which is a characteristic of the trimmed mean as a measure of center?

Accepted Answer

A)  It is similar to the mean if there are offsetting high and low extremes. 
B)  It is especially helpful in a small sample. 
C)  It does not require sorting the sample. 
D)  It is basically the same as the midrange. 
A)  It is similar to the mean if there are offsetting high and low extremes. 
B)  It is especially helpful in a small sample. 
C)  It does not require sorting the sample. 
D)  It is basically the same as the midrange.

Question 14

The second quartile is the same as the median.

Accepted Answer

A) True 
 B)False

A population consists of the following data: 7,11,12,18,20,22,25.The population variance is:

Twelve randomly chosen students were asked how many times they had missed class during a certain semester,with this result: 2,1,5,1,1,3,4,3,1,1,5,18.For this sample,the geometric mean is:

Which is a weakness of the mode?

Which is not true of an outlier?

Referring to this box plot of ice cream fat content,the median seems more "typical" of fat content than the midrange as a measure of center.

Which Excel function would be least useful to calculate the quartiles for a column of data?

In calculating the sample variance,the sum of the squared deviations around the mean is divided by n - 1 to avoid underestimating the unknown population variance.

Referring to this box plot of ice cream fat content,the mean would exceed the median.

The sum of the deviations around the mean is always zero.

Five homes were recently sold in Oxnard Acres.Four of the homes sold for $400,000 while the fifth home sold for $2.5 million.Which measure of central tendency best represents a typical home price in Oxnard Acres?

John scored 85 on Prof.Hardtack's exam (Q₁ = 40 and Q₃ = 60).Based on the fences,which is correct?

The position of the median is:

Which is a characteristic of the trimmed mean as a measure of center?

The second quartile is the same as the median.

Overview of Statistics

Data Collection

Describing Data Visually

Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions and Estimation

One-Sample Hypothesis Tests

Two-Sample Hypothesis Tests

Analysis of Variance

Simple Regression

Multiple Regression

Time-Series Analysis

Chi-Square Tests

Nonparametric Tests

Quality Management

Filters

Exam 4: Descriptive Statistics

A population consists of the following data: 7,11,12,18,20,22,25.The population variance is:

Twelve randomly chosen students were asked how many times they had missed class during a certain semester,with this result: 2,1,5,1,1,3,4,3,1,1,5,18.For this sample,the geometric mean is:

Which is a weakness of the mode?

Which is not true of an outlier?

Referring to this box plot of ice cream fat content,the median seems more "typical" of fat content than the midrange as a measure of center.

Which Excel function would be least useful to calculate the quartiles for a column of data?

In calculating the sample variance,the sum of the squared deviations around the mean is divided by n - 1 to avoid underestimating the unknown population variance.

Referring to this box plot of ice cream fat content,the mean would exceed the median.

The sum of the deviations around the mean is always zero.

Five homes were recently sold in Oxnard Acres.Four of the homes sold for $400,000 while the fifth home sold for $2.5 million.Which measure of central tendency best represents a typical home price in Oxnard Acres?

John scored 85 on Prof.Hardtack's exam (Q1 = 40 and Q3 = 60).Based on the fences,which is correct?

The position of the median is:

Which is a characteristic of the trimmed mean as a measure of center?

The second quartile is the same as the median.

Overview of Statistics

Data Collection

Describing Data Visually

Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions and Estimation

One-Sample Hypothesis Tests

Two-Sample Hypothesis Tests

Analysis of Variance

Simple Regression

Multiple Regression

Time-Series Analysis

Chi-Square Tests

Nonparametric Tests

Quality Management

Filters

John scored 85 on Prof.Hardtack's exam (Q₁ = 40 and Q₃ = 60).Based on the fences,which is correct?