Question 1

Degrees of freedom for an independent samples t-test is n-1.

Accepted Answer

A) True 
 B)False  False

Question 2

If your dataset contains twenty pairs of data, the degrees of freedom for your paired samples t-test will be ______.

Accepted Answer

A)  20 
B)  19 
C)  39 
D)  38 
A)  20 
B)  19 
C)  39 
D)  38 B

Question 3

If t(25) = 2.9, we should reject the null.

Accepted Answer

A) True 
 B)False  True

Question 4

You collect a sample of 15 survey scores from customers of Company A and 15 survey scores from customers of Company B. If 1 =3.1 2= 1.9 and sp2 = 2.55, what is the critical value of t for a two-tailed test if F1F1F1S1F1F1F10 = .05?

Accepted Answer

A)  ± 2.045 
B)  ± 2.048 
C)  ± 1.701 
D)  ± 1.699 
A)  ± 2.045 
B)  ± 2.048 
C)  ± 1.701 
D)  ± 1.699

Question 5

You collect a sample of 20 monthly employee salaries from Branch A and 20 monthly employee salaries from Branch B. If 1 = 5100.8 , 2 = 3837.7, s1 = 945.199316 and s2 = 912.399099, what is the value of the pooled variance?

Accepted Answer

A)  928.94 
B)  293.76 
C)  862936.93 
D)  none of these 
A)  928.94 
B)  293.76 
C)  862936.93 
D)  none of these

Question 6

Define and describe
 ${ }^{s_{D_{\bar{x}}}}$

Accepted Answer

@#LAT-DLM& is the standard error of the mean diffe

Question 7

Paired samples, matched samples, and related samples t-tests are all the same.

Accepted Answer

A) True 
 B)False

Question 8

Unlike a paired samples t-test, an independent samples t-test examines 2 µ's simultaneously.

Accepted Answer

A) True 
 B)False

Question 9

All paired data are repeated measures data

Accepted Answer

A) True 
 B)False

Question 10

When we reject the null in an independent samples t-test, we conclude that our 2 samples are likely to come from the same population.

Accepted Answer

A) True 
 B)False

Question 11

$  \quad $  $  \quad $  $  \quad $  $  \quad $ $\text { Revenues }$
$\begin{array}{|c|c|}
\hline \begin{array}{c}
\text { Customer } \
\text { service- } \
\text { oriented }
\end{array} & \begin{array}{c}
\text { Not customer } \
\text { service- } \
\text { oriented }
\end{array} \
\hline 4540 & 1309 \
\hline 5402 & 5265 \
\hline 6326 & 5418 \
\hline 4745 & 2838 \
\hline 4538 & 2716 \
\hline 3715 & 2524 \
\hline 5647 & 5153 \
\hline 5442 & 1944 \
\hline 6566 & 2299 \
\hline 4258 & 3503 \
\hline
\end{array}$ You're interested in differences in Revenue due to customer service orientation. Specifically, you want to know if organizations that are not customer service oriented have lower mean Revenues than organizations that are customer service oriented.
1) State the research question.
2) State the hypotheses.
3) State the critical value.
4) Provide the formal test of the hypothesis.
5) Is an effect size calculation appropriate? How do you know? If yes, calculate both a standardized and unstandardized effect size.
6) State all appropriate conclusions.

Accepted Answer

1) RQ: Do organizations that are not cus

Question 12

You collect a sample of thirty pairs of production counts per hour. You hypothesize that production counts per hour have increased between Time 1 and Time 2. If D = 19.1 and sD = 16.058836, what is the appropriate conclusion if F1F1F1S1F1F1F10 = .05?

Accepted Answer

A)  retain the null 
B)  reject the alternative 
C)  reject the null 
D)  none of these 
A)  retain the null 
B)  reject the alternative 
C)  reject the null 
D)  none of these

Question 13

The parameter of interest in a paired samples t-test is ______.

Accepted Answer

A)  µ 
B)  µD 
C)  µ1 - µ2 
D)  none of these 
A)  µ 
B)  µD 
C)  µ1 - µ2 
D)  none of these

Question 14

You collect a sample of 8 performance evaluation scores from Company A and 8 performance evaluation scores from Company B. Ifx̄ 1 =5 x̄2= 3 and sp2 = 1.25, what is the observed value of t?

Accepted Answer

A)  3.58 
B)  1.60 
C)  1.79 
D)  5.06 
A)  3.58 
B)  1.60 
C)  1.79 
D)  5.06

Question 15

Of the following, the calculations for the paired samples t-test are most similar to ______.

Accepted Answer

A)  independent samples t-test 
B)  one-sample t-test 
C)  z-test 
D)  confidence interval 
A)  independent samples t-test 
B)  one-sample t-test 
C)  z-test 
D)  confidence interval

Question 16

Independent samples come from independent sources.

Accepted Answer

A) True 
 B)False

Question 17

You collect a sample of 10 monthly production counts from Company A and 10 monthly production counts from Company B. You hypothesize that production counts for Company B will be greater than production counts from Company A. If x̄1 = 46 , x̄2 = 52.3 sp2 = 76.338889, what is the appropriate conclusion if F1F1F1S1F1F1F10 = .05?

Accepted Answer

A)  retain the null 
B)  accept the alternative 
C)  reject the null 
D)  none of these 
A)  retain the null 
B)  accept the alternative 
C)  reject the null 
D)  none of these

Question 18

Which of the following is an example of data appropriate for an independent samples test?

Accepted Answer

A)  large and small organizations 
B)  high performing and low performing employees 
C)  male trainees and female trainees 
D)  all of these 
A)  large and small organizations 
B)  high performing and low performing employees 
C)  male trainees and female trainees 
D)  all of these

Question 19

$\begin{array}{|c|c|}
\hline \text { Sales (1 year ago) } & \text { Sales (today) } \
\hline 5546 & 3582 \
\hline 5536 & 5567 \
\hline 5896 & 4712 \
\hline 5768 & 5345 \
\hline 4864 & 5382 \
\hline 6269 & 7011 \
\hline 7462 & 4411 \
\hline 3793 & 4496 \
\hline 5895 & 4821 \
\hline 7186 & 3471 \
\hline
\end{array}$ In the dataset above, sales numbers are recorded for each of our 10 employees both today and one year ago. Last year, we implemented a new training program and we would like to see if this has increased sales.
1) State the research question.
2) State the hypotheses.
3) State the critical value.
4) Provide the formal test of the hypothesis.
5) State the confidence interval.
6) Is an effect size calculation appropriate? How do you know? If yes, calculate both a standardized and unstandardized effect size.
7) State all appropriate conclusions.

Accepted Answer

1) RQ: Is there an increase in Sales ove

Question 20

In a paired samples t-test when n = 10, must contain at least 20 data.

Accepted Answer

A) True 
 B)False

Degrees of freedom for an independent samples t-test is n-1.

If your dataset contains twenty pairs of data, the degrees of freedom for your paired samples t-test will be ______.

If t(25) = 2.9, we should reject the null.

You collect a sample of 15 survey scores from customers of Company A and 15 survey scores from customers of Company B. If ₁ =3.1 ₂= 1.9 and s_p² = 2.55, what is the critical value of t for a two-tailed test if  = .05?

You collect a sample of 20 monthly employee salaries from Branch A and 20 monthly employee salaries from Branch B. If ₁ = 5100.8 , ₂= 3837.7, s₁ = 945.199316 and s₂= 912.399099, what is the value of the pooled variance?

Define and describe ${ }^{s_{D_{\bar{x}}}}$

Paired samples, matched samples, and related samples t-tests are all the same.

Unlike a paired samples t-test, an independent samples t-test examines 2 µ's simultaneously.

All paired data are repeated measures data

When we reject the null in an independent samples t-test, we conclude that our 2 samples are likely to come from the same population.

You collect a sample of thirty pairs of production counts per hour. You hypothesize that production counts per hour have increased between Time 1 and Time 2. If _D = 19.1 and s_D = 16.058836, what is the appropriate conclusion if  = .05?

The parameter of interest in a paired samples t-test is ______.

You collect a sample of 8 performance evaluation scores from Company A and 8 performance evaluation scores from Company B. Ifx̄ ₁ =5 x̄₂= 3 and s_p² = 1.25, what is the observed value of t?

Of the following, the calculations for the paired samples t-test are most similar to ______.

Independent samples come from independent sources.

Which of the following is an example of data appropriate for an independent samples test?

In a paired samples t-test when n = 10, must contain at least 20 data.

The Language of Statistics

Working With Numbers and Data Display

Central Tendency and Variability

Probability Distributions

Sampling Distributions

Estimation and Confidence Intervals

Hypothesis Testing

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

Analysis of Variance Anova

CHI-Squared Tests of Fit

Correlation R and Regression Y BX A

Matching Statistical Tests to Business Problems

Filters

Exam 9: Tests for Significance: Paired and Independent-Samples T-Test

Degrees of freedom for an independent samples t-test is n-1.

If your dataset contains twenty pairs of data, the degrees of freedom for your paired samples t-test will be ______.

If t(25) = 2.9, we should reject the null.

You collect a sample of 15 survey scores from customers of Company A and 15 survey scores from customers of Company B. If 1 =3.1 2= 1.9 and sp2 = 2.55, what is the critical value of t for a two-tailed test if  = .05?

You collect a sample of 20 monthly employee salaries from Branch A and 20 monthly employee salaries from Branch B. If 1 = 5100.8 , 2 = 3837.7, s1 = 945.199316 and s2 = 912.399099, what is the value of the pooled variance?

Define and describe sDxˉ{ }^{s_{D_{\bar{x}}}}sDxˉ​​

Paired samples, matched samples, and related samples t-tests are all the same.

Unlike a paired samples t-test, an independent samples t-test examines 2 µ's simultaneously.

All paired data are repeated measures data

When we reject the null in an independent samples t-test, we conclude that our 2 samples are likely to come from the same population.

You collect a sample of thirty pairs of production counts per hour. You hypothesize that production counts per hour have increased between Time 1 and Time 2. If D = 19.1 and sD = 16.058836, what is the appropriate conclusion if  = .05?

The parameter of interest in a paired samples t-test is ______.

You collect a sample of 8 performance evaluation scores from Company A and 8 performance evaluation scores from Company B. Ifx̄ 1 =5 x̄2= 3 and sp2 = 1.25, what is the observed value of t?

Of the following, the calculations for the paired samples t-test are most similar to ______.

Independent samples come from independent sources.

Which of the following is an example of data appropriate for an independent samples test?

In a paired samples t-test when n = 10, must contain at least 20 data.

The Language of Statistics

Working With Numbers and Data Display

Central Tendency and Variability

Probability Distributions

Sampling Distributions

Estimation and Confidence Intervals

Hypothesis Testing

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

Analysis of Variance Anova

CHI-Squared Tests of Fit

Correlation R and Regression Y BX A

Matching Statistical Tests to Business Problems

Filters

You collect a sample of 15 survey scores from customers of Company A and 15 survey scores from customers of Company B. If ₁ =3.1 ₂= 1.9 and s_p² = 2.55, what is the critical value of t for a two-tailed test if  = .05?

You collect a sample of 20 monthly employee salaries from Branch A and 20 monthly employee salaries from Branch B. If ₁ = 5100.8 , ₂= 3837.7, s₁ = 945.199316 and s₂= 912.399099, what is the value of the pooled variance?

Define and describe ${ }^{s_{D_{\bar{x}}}}$

You collect a sample of thirty pairs of production counts per hour. You hypothesize that production counts per hour have increased between Time 1 and Time 2. If _D = 19.1 and s_D = 16.058836, what is the appropriate conclusion if  = .05?

You collect a sample of 8 performance evaluation scores from Company A and 8 performance evaluation scores from Company B. Ifx̄ ₁ =5 x̄₂= 3 and s_p² = 1.25, what is the observed value of t?