Question 1

In a left-skewed distribution, we expect that the median will be greater than the mean.

Accepted Answer

A) True 
 B)False

Question 2

The Excel formula for the standard deviation of a sample array named Data is:

Accepted Answer

A) =STDEV.S(Data). 
B) =STANDEV(Data). 
C) =STDEV.P(Data). 
D) =SUM(Data)/(COUNT(Data)-1). 
A) =STDEV.S(Data). 
B) =STANDEV(Data). 
C) =STDEV.P(Data). 
D) =SUM(Data)/(COUNT(Data)-1).

Question 3

Consider the following data: 6, 7, 17, 51, 3, 17, 23, and 69. The range and the median are:

Accepted Answer

A) 69 and 17.5. 
B) 66 and 17.5. 
C) 66 and 17. 
D) 69 and 17. 
A) 69 and 17.5. 
B) 66 and 17.5. 
C) 66 and 17. 
D) 69 and 17.

Question 4

The quartiles of a distribution are most clearly revealed in which display?

Accepted Answer

A) Box plot 
B) Scatter plot 
C) Histogram 
D) Dot plot 
A) Box plot 
B) Scatter plot 
C) Histogram 
D) Dot plot

Question 5

Kurtosis cannot be judged accurately by looking at a histogram.

Accepted Answer

A) True 
 B)False

Question 6

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 7

A certain health maintenance organization (HMO) examined the number of office visits by its members in the last year. For this data set, the mean is probably not a very good measure of a "typical" person's office visits.

Accepted Answer

A) True 
 B)False

Question 8

Which Excel function is designed to calculate z = (x - μ)/σ for a column of data?

Accepted Answer

A) =STANDARDIZE 
B) =NORM.DIST 
C) =STDEV.P 
D) =AVEDEV 
A) =STANDARDIZE 
B) =NORM.DIST 
C) =STDEV.P 
D) =AVEDEV

Question 9

In a sample of 10,000 observations from a normal population, how many would you expect to lie beyond three standard deviations of the mean?

Accepted Answer

A) None of them 
B) About 27 
C) About 100 
D) About 127 
A) None of them 
B) About 27 
C) About 100 
D) About 127

Question 10

Chebyshev's Theorem says that at least 95 percent of the data lie within 2 standard deviations of the mean.

Accepted Answer

A) True 
 B)False

Question 11

Which is not a measure of variability?

Accepted Answer

A) Mean absolute deviation (MA
D)  
B) Range 
C) Coefficient of variation 
D) Trimmed mean 
A) Mean absolute deviation (MA
D)  
B) Range 
C) Coefficient of variation 
D) Trimmed mean

Question 12

A reporter for the campus paper asked five randomly chosen students how many occupants, including the driver, ride to school in their cars. The responses were 1, 1, 1, 1, 6. The coefficient of variation is:

Accepted Answer

A) 25 percent. 
B) 250 percent. 
C) 112 percent. 
D) 100 percent. 
A) 25 percent. 
B) 250 percent. 
C) 112 percent. 
D) 100 percent.

Question 13

Here are descriptive statistics from Excel for annual per-pupil expenditures in 94 Ohio cities and home sizes in a certain neighborhood. Very briefly compare the variability and shape of the two data sets.
$$\begin{array} { l r l r } 
\hline  { \text { Expenditure per Pupil (dollars) } } &&{ \text { Home Size (sqft) } } \
\hline \text { Mean } & 2724.606383 & \text { Mean } & 2231.40857 \
\text { Median } & 2508.5 & \text { Median } & 2217 \
\text { Mode } & 2506 & \text { Mode } & 2117 \
\text { Standard deviation } & 1095.217916 & \text { Standard deviation } & 249.3151 \
\text { Kurtosis } & 43.9989606 & \text { Kurtosis } & 0.52824942 \
\text { Skewness } & 6.260249912 & \text { Skewness } & 0.35668642 \
\text { Range } & 9310 & \text { Range } & 1315.4 \
\text { Minimum } & 1916 & \text { Minimum } & 1593 \
\text { Maximum } & 11226 & \text { Maximum } & 2908 \
\text { Count } & 94 & \text { Count } & 105 \
\hline
\end{array}$$

Accepted Answer

Expenditure per pupil is right-skewed (m

Question 14

Outliers are data values that fall beyond ±2 standard deviations from the mean.

Accepted Answer

A) True 
 B)False

Question 15

Here are statistics on order sizes of Megalith Construction Supply's shipments of two kinds of construction materials last year. $$\begin{array} { l c r } 
& \text { Girders } & \text { Rivets } \
\text { Mean } & 160 & 2800 \
\text { Std. Dev. } & 48 & 702
\end{array}$$ Which order sizes have greater variability?

Accepted Answer

A) Girders 
B) Rivets 
C) They are the same. 
D) Cannot be determined without knowing n $\overline { X ^ { * } }$ $\overline { X ^ { * } }$ 
A) Girders 
B) Rivets 
C) They are the same. 
D) Cannot be determined without knowing n $\overline { X ^ { * } }$ $\overline { X ^ { * } }$

Question 16

Chebyshev's Theorem:

Accepted Answer

A) applies to all samples. 
B) applies only to samples from a normal population. 
C) gives a narrower range of predictions than the Empirical Rule. 
D) is based on Sturges' Rule for data classification.The strength of Chebyshev's Theorem is that it makes no assumption about normality, while the 
A) applies to all samples. 
B) applies only to samples from a normal population. 
C) gives a narrower range of predictions than the Empirical Rule. 
D) is based on Sturges' Rule for data classification.The strength of Chebyshev's Theorem is that it makes no assumption about normality, while the

Question 17

If there are 19 data values, the median will have 10 values above it and 9 below it since n is odd.

Accepted Answer

A) True 
 B)False

Question 18

Given the data set 10, 5, 2, 6, 3, 4, 20, the median value is 5.

Accepted Answer

A) True 
 B)False

Question 19

What does the graph below (profit/sales ratios for 25 Fortune 500 companies) reveal?

Accepted Answer

A) That the median exceeds the mean. 
B) That the data are slightly left-skewed. 
C) That the interquartile range is about 8. 
D) That the distribution is bell-shaped. 
A) That the median exceeds the mean. 
B) That the data are slightly left-skewed. 
C) That the interquartile range is about 8. 
D) That the distribution is bell-shaped.

Question 20

Which is not true of the Empirical Rule?

Accepted Answer

A) It applies to any distribution. 
B) It can be applied to fewer distributions than Chebyshev's Theorem. 
C) It assumes that the distribution of data follows a bell-shaped, normal curve. 
D) It predicts more observations within μ ± kσ than Chebyshev's Theorem.The 
A) It applies to any distribution. 
B) It can be applied to fewer distributions than Chebyshev's Theorem. 
C) It assumes that the distribution of data follows a bell-shaped, normal curve. 
D) It predicts more observations within μ ± kσ than Chebyshev's Theorem.The

In a left-skewed distribution, we expect that the median will be greater than the mean.

The Excel formula for the standard deviation of a sample array named Data is:

Consider the following data: 6, 7, 17, 51, 3, 17, 23, and 69. The range and the median are:

The quartiles of a distribution are most clearly revealed in which display?

Kurtosis cannot be judged accurately by looking at a histogram.

The position of the median is:

A certain health maintenance organization (HMO) examined the number of office visits by its members in the last year. For this data set, the mean is probably not a very good measure of a "typical" person's office visits.

Which Excel function is designed to calculate z = (x - μ)/σ for a column of data?

In a sample of 10,000 observations from a normal population, how many would you expect to lie beyond three standard deviations of the mean?

Chebyshev's Theorem says that at least 95 percent of the data lie within 2 standard deviations of the mean.

Which is not a measure of variability?

A reporter for the campus paper asked five randomly chosen students how many occupants, including the driver, ride to school in their cars. The responses were 1, 1, 1, 1, 6. The coefficient of variation is:

Outliers are data values that fall beyond ±2 standard deviations from the mean.

Here are statistics on order sizes of Megalith Construction Supply's shipments of two kinds of construction materials last year. Girders Rivets Mean 160 2800 Std. Dev. 48 702 Which order sizes have greater variability?

Chebyshev's Theorem:

If there are 19 data values, the median will have 10 values above it and 9 below it since n is odd.

Given the data set 10, 5, 2, 6, 3, 4, 20, the median value is 5.

What does the graph below (profit/sales ratios for 25 Fortune 500 companies) reveal?

Which is not true of the Empirical Rule?

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

In a left-skewed distribution, we expect that the median will be greater than the mean.

The Excel formula for the standard deviation of a sample array named Data is:

Consider the following data: 6, 7, 17, 51, 3, 17, 23, and 69. The range and the median are:

The quartiles of a distribution are most clearly revealed in which display?

Kurtosis cannot be judged accurately by looking at a histogram.

The position of the median is:

A certain health maintenance organization (HMO) examined the number of office visits by its members in the last year. For this data set, the mean is probably not a very good measure of a "typical" person's office visits.

Which Excel function is designed to calculate z = (x - μ)/σ for a column of data?

In a sample of 10,000 observations from a normal population, how many would you expect to lie beyond three standard deviations of the mean?

Chebyshev's Theorem says that at least 95 percent of the data lie within 2 standard deviations of the mean.

Which is not a measure of variability?

A reporter for the campus paper asked five randomly chosen students how many occupants, including the driver, ride to school in their cars. The responses were 1, 1, 1, 1, 6. The coefficient of variation is:

Outliers are data values that fall beyond ±2 standard deviations from the mean.

Here are statistics on order sizes of Megalith Construction Supply's shipments of two kinds of construction materials last year. Girders Rivets Mean 160 2800 Std. Dev. 48 702 Which order sizes have greater variability?

Chebyshev's Theorem:

If there are 19 data values, the median will have 10 values above it and 9 below it since n is odd.

Given the data set 10, 5, 2, 6, 3, 4, 20, the median value is 5.

What does the graph below (profit/sales ratios for 25 Fortune 500 companies) reveal?

Which is not true of the Empirical Rule?

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