A researcher wanted to determine if using an octane booster would increase gasoline mileage. A random sample of seven cars was selected; the cars were driven for two weeks without the booster and two weeks with the booster. \[\begin{array} { | l | l | } \hline \text { Miles / Gal Without } & \text { Miles / Gal With } \\ \hline 21.2 & 23.8 \\ \hline 25.4 & 25.6 \\ \hline 20.9 & 22.4 \\ \hline 27.6 & 28.3 \\ \hline 22.8 & 24.5 \\ \hline 27.3 & 28.8 \\ \hline 23.4 & 25.2 \\ \hline \end{array}\] -What is the critical value using \[a = 0.05\] ?

A) -1.782 B) -1.761 C) -1.943 D) -1.895 A) -1.782 B) -1.761 C) -1.943 D) -1.895

Exam 8: Testing the Difference Between Two Means, Two Proportions, and Two Variances

What is the critical value for a two-tailed F -test with $a = 0.10$ when the sample size from which the variance for the numerator was obtained was 10, and the sample size from which the denominator was Obtained was 24?

(Multiple Choice)

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Question 61

Find $\bar { p }$ and $\bar { q }$ when $X _ { 1 } = 10 , n _ { 1 } = 60 , X _ { 2 } = 15$ , and $n _ { 2 } = 60$

(Multiple Choice)

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Question 62

In a study comparing the systolic blood pressure of individuals sitting and standing, 10 subjects had their blood pressure measured in the two conditions. The investigator planned to test the hypothesis that the Mean blood pressure readings are the same sitting and standing (the subjects remained in each position For 5 minutes). If the investigator tests at the 10% level of significance, the rejection region would be

(Multiple Choice)

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Question 63

When hypothesizing a difference of 0, if the confidence interval does not contain 0, the null hypothesis is rejected.

(True/False)

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Question 64

What is the critical value? Use $\alpha = 0.05$ (Use the variances unequal formula.)

(Multiple Choice)

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Question 65

A marketing firm asked a random set of married women and married men how much they were willing to spend for jewellery as a present for their spouse. Can the firm conclude, at $A marketing firm asked a random set of married women and married men how much they were willing to spend for jewellery as a present for their spouse. Can the firm conclude, at , that Each of the two groups has a different willingness to spend? (Use the unequal variances formula.) \begin{array} { | l | c | c | } \hline & \text { Women } & \text { Men } \\ \hline \text { Sample size } & 8 & 11 \\ \hline \text { Mean spending amount } & 80 & 55 \\ \hline \text { Sample variance } & 50 & 800 \\ \hline \end{array}$ , that Each of the two groups has a different willingness to spend? (Use the unequal variances formula.) Women Men Sample size 8 11 Mean spending amount 80 55 Sample variance 50 800

(Multiple Choice)

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Question 66

What is the test value? Use $a = 0.05$ Refer To: 09-18

(Multiple Choice)

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Question 67

A researcher wanted to determine if using an octane booster would increase gasoline mileage. A random sample of seven cars was selected; the cars were driven for two weeks without the booster and two weeks with the booster. Miles / Gal Without Miles / Gal With 21.2 23.8 25.4 25.6 20.9 22.4 27.6 28.3 22.8 24.5 27.3 28.8 23.4 25.2 -What is the critical value using $a = 0.05$ ?

(Multiple Choice)

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Question 68

The value of F cannot be negative, because variances are always positive or zero.

(True/False)

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Question 69

A college class believes that the average grade averages of psychology students and the average grade averages of biology students are different. The class found that the actual grade averages of a sample of 10 psychology students was 3.2, and the average grade average of a sample of 10 biology students was

(Essay)

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Question 70

When finding the F -test value, the smaller of the variances is placed in the numerator.

(True/False)

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Question 71

$\text { If } \mathrm { s } _ { 1 } = 12.31 \text { and } F = 2.13 \text {, what is the value of } \mathrm { s } _ { 2 } \text { as shown in the figure below? }$ $\text { If } \mathrm { s } _ { 1 } = 12.31 \text { and } F = 2.13 \text {, what is the value of } \mathrm { s } _ { 2 } \text { as shown in the figure below? }$

(Multiple Choice)

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Question 72

A study of cats and dogs found that 25 of 50 cats and 44 of 60 dogs slept more than 10 hours per day. At the .05 level of significance, is there sufficient evidence to conclude that a difference exists between the Proportion of cats and the proportion of dogs that sleep more than 10 hours per day?

(Multiple Choice)

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Question 73

When testing the difference between two proportions, one sample had 30 out of 100 who were for capital punishment, and the other sample had 60 out of 80 who were for capital punishment. Calculate the Standard error.

(Multiple Choice)

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Question 74

Showing 61 - 74 of 74

What is the critical value for a two-tailed F -test with $a = 0.10$ when the sample size from which the variance for the numerator was obtained was 10, and the sample size from which the denominator was Obtained was 24?

Find $\bar { p }$ and $\bar { q }$ when $X _ { 1 } = 10 , n _ { 1 } = 60 , X _ { 2 } = 15$ , and $n _ { 2 } = 60$

When hypothesizing a difference of 0, if the confidence interval does not contain 0, the null hypothesis is rejected.

What is the critical value? Use $\alpha = 0.05$ (Use the variances unequal formula.)

What is the test value? Use $a = 0.05$ Refer To: 09-18

The value of F cannot be negative, because variances are always positive or zero.

When finding the F -test value, the smaller of the variances is placed in the numerator.

A study of cats and dogs found that 25 of 50 cats and 44 of 60 dogs slept more than 10 hours per day. At the .05 level of significance, is there sufficient evidence to conclude that a difference exists between the Proportion of cats and the proportion of dogs that sleep more than 10 hours per day?

When testing the difference between two proportions, one sample had 30 out of 100 who were for capital punishment, and the other sample had 60 out of 80 who were for capital punishment. Calculate the Standard error.

The Nature of Probability and Statistics

Frequency Distributions and Graphs

Data Description

Discrete Probability Distributions

The Normal Distribution

Confidence Intervals and Sample Size

Hypothesis Testing

Correlation and Regression

Chi-Square and Analysis of Variance Anova

Tables

Data Bank

Glossary

Filters

Exam 8: Testing the Difference Between Two Means, Two Proportions, and Two Variances

What is the critical value for a two-tailed F -test with a=0.10a = 0.10a=0.10 when the sample size from which the variance for the numerator was obtained was 10, and the sample size from which the denominator was Obtained was 24?

Find pˉ\bar { p }pˉ​ and qˉ\bar { q }qˉ​ when X1=10,n1=60,X2=15X _ { 1 } = 10 , n _ { 1 } = 60 , X _ { 2 } = 15X1​=10,n1​=60,X2​=15 , and n2=60n _ { 2 } = 60n2​=60

When hypothesizing a difference of 0, if the confidence interval does not contain 0, the null hypothesis is rejected.

What is the critical value? Use α=0.05\alpha = 0.05α=0.05 (Use the variances unequal formula.)

What is the test value? Use a=0.05a = 0.05a=0.05 Refer To: 09-18

The value of F cannot be negative, because variances are always positive or zero.

When finding the F -test value, the smaller of the variances is placed in the numerator.

A study of cats and dogs found that 25 of 50 cats and 44 of 60 dogs slept more than 10 hours per day. At the .05 level of significance, is there sufficient evidence to conclude that a difference exists between the Proportion of cats and the proportion of dogs that sleep more than 10 hours per day?

When testing the difference between two proportions, one sample had 30 out of 100 who were for capital punishment, and the other sample had 60 out of 80 who were for capital punishment. Calculate the Standard error.

The Nature of Probability and Statistics

Frequency Distributions and Graphs

Data Description

Discrete Probability Distributions

The Normal Distribution

Confidence Intervals and Sample Size

Hypothesis Testing

Correlation and Regression

Chi-Square and Analysis of Variance Anova

Tables

Data Bank

Glossary

Filters

What is the critical value for a two-tailed F -test with $a = 0.10$ when the sample size from which the variance for the numerator was obtained was 10, and the sample size from which the denominator was Obtained was 24?

Find $\bar { p }$ and $\bar { q }$ when $X _ { 1 } = 10 , n _ { 1 } = 60 , X _ { 2 } = 15$ , and $n _ { 2 } = 60$

What is the critical value? Use $\alpha = 0.05$ (Use the variances unequal formula.)

What is the test value? Use $a = 0.05$ Refer To: 09-18