Question 1

In a five number summary, which of the following is not used for data summarization?

Accepted Answer

A)  The smallest value 
B)  The largest value 
C)  The mean 
D)  The 25th percentile 
A)  The smallest value 
B)  The largest value 
C)  The mean 
D)  The 25th percentile

Question 2

The following frequency distribution shows the ACT scores of a sample of students: $$\begin{array} { l r } 
\text { Score } & \text { Frequency } \
14 - 18 & 2 \
19 - 23 & 5 \
24 - 28 & 12 \
29 - 33 & 1
\end{array}$$ For the above data, compute the following. 
a.
The mean
b.
The standard deviation

Accepted Answer

The answer of The following frequency distribution shows the ACT...

Question 3

​Functionality in interactive data dashboards that allows the user to access information and analyse at an increasingly detailed level is referred to as

Accepted Answer

A)  ​drilling down. 
B)  transformation. 
C)  ​root-cause analysis. 
D)  data trimming. 
A)  ​drilling down. 
B)  transformation. 
C)  ​root-cause analysis. 
D)  data trimming.

Question 4

​Which of the following descriptive statistics is not measured in the same units as the data?

Accepted Answer

A)  ​35th percentile 
B)  Standard deviation 
C)  ​Variance 
D)  ​Interquartile range 
A)  ​35th percentile 
B)  Standard deviation 
C)  ​Variance 
D)  ​Interquartile range

Question 5

The descriptive measure of variability that is based on the concept of a deviation about the mean is

Accepted Answer

A)  the range. 
B)  the interquartile range. 
C)  the absolute value of the range. 
D)  the standard deviation. 
A)  the range. 
B)  the interquartile range. 
C)  the absolute value of the range. 
D)  the standard deviation.

Question 6

The price of a selected stock over a five day period is shown below.
​
17, 11, 13, 17, 16
​
Using the above data, compute the mean, the median, and the mode.

Accepted Answer

Mean = 14.

Question 7

The variance of a sample was reported to be 144.The report indicated that $\sum ( x - \bar { x } ) ^ { 2 }$ = 7200.What is the sample size?

Accepted Answer

A)  49 
B)  50 
C)  51 
D)  52 
A)  49 
B)  50 
C)  51 
D)  52

Question 8

The standard deviation of a sample of 100 observations equals 64.The variance of the sample equals

Accepted Answer

A)  8. 
B)  10. 
C)  6400. 
D)  4,096. 
A)  8. 
B)  10. 
C)  6400. 
D)  4,096.

Question 9

The flashlight batteries produced by one of the northern manufacturers are known to have an average life of 60 hours with a standard deviation of 4 hours.Use Chebyshev's theorem to answer the following questions.
a.
At least what percentage of flashlights will have a life of 54 to 66 hours?
b.
At least what percentage of the batteries will have a life of 52 to 68 hours?
c.
Determine an interval for the lives of the batteries that will be true for at least 80% of the batteries. (Hint: First compute the Z-score.)

Accepted Answer

a.
56%
b.
75%
c.
60 + (2.236)(

Question 10

​The percentage of data values that must be within one, two, and three standard deviations of the mean for data having a bell-shaped distribution can be determined using

Accepted Answer

A)  ​Chebyshev's theorem. 
B)  The empirical rule. 
C)  ​A five-number summary. 
D)  ​Percentiles. 
A)  ​Chebyshev's theorem. 
B)  The empirical rule. 
C)  ​A five-number summary. 
D)  ​Percentiles.

Question 11

​A box plot is a graphical representation of data that is based on

Accepted Answer

A)  ​the empirical rule. 
B)  ​z-scores. 
C)  ​a histogram. 
D)  ​a five number summary. 
A)  ​the empirical rule. 
B)  ​z-scores. 
C)  ​a histogram. 
D)  ​a five number summary.

Question 12

The standard deviation of a sample was reported to be 20.The report indicated that $\sum ( x - \bar { x } ) ^ { 2 }$ = 7200.What is the sample size?

Accepted Answer

A)  16 
B)  17 
C)  18 
D)  19 
A)  16 
B)  17 
C)  18 
D)  19

Question 13

The variance can never be

Accepted Answer

A)  zero. 
B)  larger than the standard deviation. 
C)  negative. 
D)  smaller than the standard deviation. 
A)  zero. 
B)  larger than the standard deviation. 
C)  negative. 
D)  smaller than the standard deviation.

Question 14

The geometric mean of 1, 1, 8 is

Accepted Answer

A)  10.0. 
B)  2.0. 
C)  3.33. 
D)  3.0. 
A)  10.0. 
B)  2.0. 
C)  3.33. 
D)  3.0.

Question 15

The relative frequency of a class is computed by

Accepted Answer

A)  dividing the midpoint of the class by the sample size. 
B)  dividing the frequency of the class by the midpoint. 
C)  dividing the sample size by the frequency of the class. 
D)  dividing the frequency of the class by the sample size. 
A)  dividing the midpoint of the class by the sample size. 
B)  dividing the frequency of the class by the midpoint. 
C)  dividing the sample size by the frequency of the class. 
D)  dividing the frequency of the class by the sample size.

Question 16

​An important numerical measure of the shape of a distribution is the

Accepted Answer

A)  ​variance. 
B)  ​z-score. 
C)  ​coefficient of variation. 
D)  ​skewness. 
A)  ​variance. 
B)  ​z-score. 
C)  ​coefficient of variation. 
D)  ​skewness.

Question 17

In computing the mean of a sample, the value of ∑xi is divided by

Accepted Answer

A)  n. 
B)  n - 1. 
C)  n + 1. 
D)  n - 2. 
A)  n. 
B)  n - 1. 
C)  n + 1. 
D)  n - 2.

Question 18

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

Accepted Answer

A)  9. 
B)  4096. 
C)  8. 
D)  6561. 
A)  9. 
B)  4096. 
C)  8. 
D)  6561.

Question 19

​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 20

Which of the following is not a measure of variability of a single variable?​

Accepted Answer

A)  Range 
B)  ​Covariance 
C)  ​Standard deviation 
D)  ​Interquartile range 
A)  Range 
B)  ​Covariance 
C)  ​Standard deviation 
D)  ​Interquartile range

In a five number summary, which of the following is not used for data summarization?

The following frequency distribution shows the ACT scores of a sample of students: Score Frequency 14-18 2 19-23 5 24-28 12 29-33 1 For the above data, compute the following. a. The mean b. The standard deviation

Functionality in interactive data dashboards that allows the user to access information and analyse at an increasingly detailed level is referred to as

Which of the following descriptive statistics is not measured in the same units as the data?

The descriptive measure of variability that is based on the concept of a deviation about the mean is

The price of a selected stock over a five day period is shown below. 17, 11, 13, 17, 16 Using the above data, compute the mean, the median, and the mode.

The variance of a sample was reported to be 144.The report indicated that $\sum ( x - \bar { x } ) ^ { 2 }$ = 7200.What is the sample size?

The standard deviation of a sample of 100 observations equals 64.The variance of the sample equals

The percentage of data values that must be within one, two, and three standard deviations of the mean for data having a bell-shaped distribution can be determined using

A box plot is a graphical representation of data that is based on

The standard deviation of a sample was reported to be 20.The report indicated that $\sum ( x - \bar { x } ) ^ { 2 }$ = 7200.What is the sample size?

The variance can never be

The geometric mean of 1, 1, 8 is

The relative frequency of a class is computed by

An important numerical measure of the shape of a distribution is the

In computing the mean of a sample, the value of ∑x_i is divided by

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

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

Which of the following is not a measure of variability of a single variable?

Data and Statistics

Descriptive Statistics: Tabulargraphical

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

Comparing Multiple Proportions, Test of Independence and Goodness of Fit

Experimental Design and Analysis of Variance

Simple Linear Regression

Multiple Regression

Filters

Exam 3: Descriptive Statistics: Numerical

In a five number summary, which of the following is not used for data summarization?

The following frequency distribution shows the ACT scores of a sample of students: Score Frequency 14-18 2 19-23 5 24-28 12 29-33 1 For the above data, compute the following. a. The mean b. The standard deviation

​Functionality in interactive data dashboards that allows the user to access information and analyse at an increasingly detailed level is referred to as

​Which of the following descriptive statistics is not measured in the same units as the data?

The descriptive measure of variability that is based on the concept of a deviation about the mean is

The price of a selected stock over a five day period is shown below. ​ 17, 11, 13, 17, 16 ​ Using the above data, compute the mean, the median, and the mode.

The variance of a sample was reported to be 144.The report indicated that ∑(x−xˉ)2\sum ( x - \bar { x } ) ^ { 2 }∑(x−xˉ)2 = 7200.What is the sample size?

The standard deviation of a sample of 100 observations equals 64.The variance of the sample equals

​The percentage of data values that must be within one, two, and three standard deviations of the mean for data having a bell-shaped distribution can be determined using

​A box plot is a graphical representation of data that is based on

The standard deviation of a sample was reported to be 20.The report indicated that ∑(x−xˉ)2\sum ( x - \bar { x } ) ^ { 2 }∑(x−xˉ)2 = 7200.What is the sample size?

The variance can never be

The geometric mean of 1, 1, 8 is

The relative frequency of a class is computed by

​An important numerical measure of the shape of a distribution is the

In computing the mean of a sample, the value of ∑xi is divided by

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

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

Which of the following is not a measure of variability of a single variable?​

Data and Statistics

Descriptive Statistics: Tabulargraphical

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

Comparing Multiple Proportions, Test of Independence and Goodness of Fit

Experimental Design and Analysis of Variance

Simple Linear Regression

Multiple Regression

Filters

Functionality in interactive data dashboards that allows the user to access information and analyse at an increasingly detailed level is referred to as

Which of the following descriptive statistics is not measured in the same units as the data?

The price of a selected stock over a five day period is shown below. 17, 11, 13, 17, 16 Using the above data, compute the mean, the median, and the mode.

The variance of a sample was reported to be 144.The report indicated that $\sum ( x - \bar { x } ) ^ { 2 }$ = 7200.What is the sample size?

The percentage of data values that must be within one, two, and three standard deviations of the mean for data having a bell-shaped distribution can be determined using

A box plot is a graphical representation of data that is based on

The standard deviation of a sample was reported to be 20.The report indicated that $\sum ( x - \bar { x } ) ^ { 2 }$ = 7200.What is the sample size?

An important numerical measure of the shape of a distribution is the

In computing the mean of a sample, the value of ∑x_i is divided by

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

Which of the following is not a measure of variability of a single variable?