Question 1

Conditions that must be true for a statistic to be meaningful are considered assumptions.

Accepted Answer

A) True 
 B)False

Question 2

You need a bias correction for sample estimates of the variance because samples systematically overestimate population variance.

Accepted Answer

A) True 
 B)False

Question 3

The range is generally not a good way to assess variability because ______.

Accepted Answer

A)  it is too robust 
B)  it is easily influenced by outliers 
C)  it does not measure variability 
D)  it is difficult to calculate 
A)  it is too robust 
B)  it is easily influenced by outliers 
C)  it does not measure variability 
D)  it is difficult to calculate

Question 4

Calculate F1F1F1S1F1F1F10x for the following production data: 10, 20, 30, 40

Accepted Answer

A)  25 
B)  4 
C)  100 
D)  none of these 
A)  25 
B)  4 
C)  100 
D)  none of these

Question 5

Given a distribution with a median of 0, if your data had a negative skew, you would expect to see ______.

Accepted Answer

A)  the tail would point toward positive numbers 
B)  the tail would point toward negative numbers 
C)  the tails would point evenly in both directions 
D)  there would be no tail(s) 
A)  the tail would point toward positive numbers 
B)  the tail would point toward negative numbers 
C)  the tails would point evenly in both directions 
D)  there would be no tail(s)

Question 6

The sales manager recently collected a dataset containing the number of days that it took each employees to make his/her first sale after being hired. This dataset appears below. Use it to respond to Questions . For all problems, show work.
 $\begin{array}{|l|}
\hline \text { Days } \
\hline 26 \
\hline 23 \
\hline 34 \
\hline 21 \
\hline 31 \
\hline 31 \
\hline 33 \
\hline 27 \
\hline 25 \
\hline 13 \
\hline
\end{array}$
-Calculate the median of this sample.

Accepted Answer

The answer of The sales manager recently collected a dataset...

Question 7

s2 is a sample statistic.

Accepted Answer

A) True 
 B)False

Question 8

If you wanted to find the difference between the smallest and largest score in a variable, you would calculate the ______.

Accepted Answer

A)  variance 
B)  variability 
C)  standard deviation 
D)  range 
A)  variance 
B)  variability 
C)  standard deviation 
D)  range

Question 9

Which of the following symbols represents a parameter?

Accepted Answer

A)  n 
B)  x̄ 
C)  s2 
D)  F1F1F1S1F1F1F10 
A)  n 
B)  x̄ 
C)  s2 
D)  F1F1F1S1F1F1F10

Question 10

The sales manager recently collected a dataset containing the number of days that it took each employees to make his/her first sale after being hired. This dataset appears below. Use it to respond to Questions . For all problems, show work.
 $\begin{array}{|l|}
\hline \text { Days } \
\hline 26 \
\hline 23 \
\hline 34 \
\hline 21 \
\hline 31 \
\hline 31 \
\hline 33 \
\hline 27 \
\hline 25 \
\hline 13 \
\hline
\end{array}$
-Calculate the variance of this sample.

Accepted Answer

The answer of The sales manager recently collected a dataset...

Question 11

Determine the variance of the following sample of survey data: 2, 1, 3, 3, 4

Accepted Answer

A)  1.04 
B)  1.02 
C)  1.30 
D)  1.14 
A)  1.04 
B)  1.02 
C)  1.30 
D)  1.14

Question 12

Determine the mean for the following survey data: 3, 2, 5, 4, 2

Accepted Answer

A)  1.7 
B)  3 
C)  3.2 
D)  16 
A)  1.7 
B)  3 
C)  3.2 
D)  16

Question 13

Determine the variance of the following population of survey data: 3, 4, 4, 1, 2

Accepted Answer

A)  1.17 
B)  1.36 
C)  1.70 
D)  1.30 
A)  1.17 
B)  1.36 
C)  1.70 
D)  1.30

Question 14

If you're calculating F1F1F1S1F1F1F102, which of the following should you use for your mean?

Accepted Answer

A)  m 
B)  F1F1F1S1F1F1F10 
C)  x̄ 
D)  none of these 
A)  m 
B)  F1F1F1S1F1F1F10 
C)  x̄ 
D)  none of these

Question 15

The average distance between all scores in a variable and their mean is the standard deviation.

Accepted Answer

A) True 
 B)False

Question 16

You should use the conceptual formula of variance instead of the computational formula when ______.

Accepted Answer

A)  you're working with a population 
B)  you're working with a sample 
C)  you're working with discrete data 
D)  none of these 
A)  you're working with a population 
B)  you're working with a sample 
C)  you're working with discrete data 
D)  none of these

Question 17

Describe the three common types of shapes of data discussed in Chapter 3. Draw an example of each.

Accepted Answer

The normal distribution is bell-shaped.

Question 18

How would you pronounce this symbol F1F1F1S1F1F1F10x?

Accepted Answer

A)  mean of x 
B)  product of x 
C)  sum of x 
D)  none of these 
A)  mean of x 
B)  product of x 
C)  sum of x 
D)  none of these

Question 19

For each of the three measures of central tendency, give an example of when it would be appropriate to use and when it would be inappropriate to use (up to six total examples). Explain why in each case.

Accepted Answer

The mean, median, and mode would be appr

Question 20

The correct formulaic notation for the mean is ______.

Accepted Answer

A)  Ẍ 
B)  X ′ 
C)  x̄̄ 
D)  x̄ 
A)  Ẍ 
B)  X ′ 
C)  x̄̄ 
D)  x̄

Conditions that must be true for a statistic to be meaningful are considered assumptions.

You need a bias correction for sample estimates of the variance because samples systematically overestimate population variance.

The range is generally not a good way to assess variability because ______.

Calculate x for the following production data: 10, 20, 30, 40

Given a distribution with a median of 0, if your data had a negative skew, you would expect to see ______.

s² is a sample statistic.

If you wanted to find the difference between the smallest and largest score in a variable, you would calculate the ______.

Which of the following symbols represents a parameter?

Determine the variance of the following sample of survey data: 2, 1, 3, 3, 4

Determine the mean for the following survey data: 3, 2, 5, 4, 2

Determine the variance of the following population of survey data: 3, 4, 4, 1, 2

If you're calculating ², which of the following should you use for your mean?

The average distance between all scores in a variable and their mean is the standard deviation.

You should use the conceptual formula of variance instead of the computational formula when ______.

Describe the three common types of shapes of data discussed in Chapter 3. Draw an example of each.

How would you pronounce this symbol x?

For each of the three measures of central tendency, give an example of when it would be appropriate to use and when it would be inappropriate to use (up to six total examples). Explain why in each case.

The correct formulaic notation for the mean is ______.

The Language of Statistics

Working With Numbers and Data Display

Probability Distributions

Sampling Distributions

Estimation and Confidence Intervals

Hypothesis Testing

Tests for Significance: Z-Tests and One-Sample T-Tests

Tests for Significance: Paired and Independent-Samples T-Test

Analysis of Variance Anova

CHI-Squared Tests of Fit

Correlation R and Regression Y BX A

Matching Statistical Tests to Business Problems

Filters

Exam 3: Central Tendency and Variability

Conditions that must be true for a statistic to be meaningful are considered assumptions.

You need a bias correction for sample estimates of the variance because samples systematically overestimate population variance.

The range is generally not a good way to assess variability because ______.

Calculate x for the following production data: 10, 20, 30, 40

Given a distribution with a median of 0, if your data had a negative skew, you would expect to see ______.

s2 is a sample statistic.

If you wanted to find the difference between the smallest and largest score in a variable, you would calculate the ______.

Which of the following symbols represents a parameter?

Determine the variance of the following sample of survey data: 2, 1, 3, 3, 4

Determine the mean for the following survey data: 3, 2, 5, 4, 2

Determine the variance of the following population of survey data: 3, 4, 4, 1, 2

If you're calculating 2, which of the following should you use for your mean?

The average distance between all scores in a variable and their mean is the standard deviation.

You should use the conceptual formula of variance instead of the computational formula when ______.

Describe the three common types of shapes of data discussed in Chapter 3. Draw an example of each.

How would you pronounce this symbol x?

For each of the three measures of central tendency, give an example of when it would be appropriate to use and when it would be inappropriate to use (up to six total examples). Explain why in each case.

The correct formulaic notation for the mean is ______.

The Language of Statistics

Working With Numbers and Data Display

Probability Distributions

Sampling Distributions

Estimation and Confidence Intervals

Hypothesis Testing

Tests for Significance: Z-Tests and One-Sample T-Tests

Tests for Significance: Paired and Independent-Samples T-Test

Analysis of Variance Anova

CHI-Squared Tests of Fit

Correlation R and Regression Y BX A

Matching Statistical Tests to Business Problems

Filters

s² is a sample statistic.

If you're calculating ², which of the following should you use for your mean?