The degree of freedom as the smaller of n 1 − 1 and n 2 − 1 .

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Answer 1

Question

Chapter 10.1, Problem 31E

a.

To determine

To find: The degree of freedom as the smaller of n1−1 and n2−1 .

b.

To determine

To find: The critical value tα/2 .

c.

To determine

To find: The 95% confidence interval.

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In exploring possible sites for a convenience store in a large neighbourhood, the retail chain wants to know the proportion of ratepayers in favour of the proposal. If the estimate is required to be within 0.1 of the true proportion, would a random sample of size n = 100 from the council records be sufficient for a 95% confidence interval of this precision?

A 30 month study is conducted to determine the difference in rates of accidents per month between two departments in an assembly plant. If a sample of 12 from the first department averaged 12.3 accidents per month with a standard deviation of 3.5, and a sample of 9 from the second department averaged 7.6 accidents per month with standard deviation of 3.4, find: The t-value for a 95% confidence interval is: A. 2.09302 B. 1.724718 C. 2.08596 D. 1.729133 E. none of the preceding

Based on your confidence interval from the previous problem, can you conclude that the mean permeability coefficient at 60∘60∘C differs from that at 61∘61∘C at the 0.05 level of significance? A. Yes, because the 95% confidence interval includes 0 B. No, because the 95% confidence interval includes 0 C. Yes, because the 95% confidence interval does not include 0 D. No, because the 95% confidence interval does not include 0 E. It is impossible answer this question only using the 95% confidence interval.

Answer 2

Question

Chapter 10.1, Problem 31E

a.

To determine

To find: The degree of freedom as the smaller of n1−1 and n2−1 .

b.

To determine

To find: The critical value tα/2 .

c.

To determine

To find: The 95% confidence interval.

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Answer 3

Question

Chapter 10.1, Problem 31E

a.

To determine

To find: The degree of freedom as the smaller of n1−1 and n2−1 .

b.

To determine

To find: The critical value tα/2 .

c.

To determine

To find: The 95% confidence interval.

Expert Solution & Answer

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Answer 4

Question

Chapter 10.1, Problem 31E

a.

To determine

To find: The degree of freedom as the smaller of n1−1 and n2−1 .

b.

To determine

To find: The critical value tα/2 .

c.

To determine

To find: The 95% confidence interval.

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Answer 5

Chapter 10.1, Problem 31E

a.

To determine

To find: The degree of freedom as the smaller of n1−1 and n2−1 .

b.

To determine

To find: The critical value tα/2 .

c.

To determine

To find: The 95% confidence interval.

Answer 6

Chapter 10.1, Problem 31E

a.

To determine

To find: The degree of freedom as the smaller of n1−1 and n2−1 .

Answer 7

Chapter 10.1, Problem 31E

a.

To determine

To find: The degree of freedom as the smaller of n1−1 and n2−1 .

Answer 8

b.

To determine

To find: The critical value tα/2 .

Answer 9

b.

To determine

To find: The critical value tα/2 .

Answer 10

c.

To determine

To find: The 95% confidence interval.

Answer 11

c.

To determine

To find: The 95% confidence interval.

Answer 12

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Answer 13

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Answer 14

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Answer 15

Ch. 10.1 - In Exercises 5 and 6, fill in each blank with e...Ch. 10.1 - In Exercises 5 and 6, fill in each blank with e...Ch. 10.1 - Prob. 7E Ch. 10.1 - Prob. 8E Ch. 10.1 - In Exercises 9-14, construct the confidence...Ch. 10.1 - Prob. 10E Ch. 10.1 - In Exercises 9-14, construct the confidence...Ch. 10.1 - Prob. 12E Ch. 10.1 - Prob. 13E Ch. 10.1 - Prob. 14E

The degree of freedom as the smaller of n 1 − 1 and n 2 − 1 .

Solution Summary: The author explains how TI-84 Plus calculator is used to find the degree of freedom as the smaller of n_1-1, and

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To find: The degree of freedom as the smaller of n1−1 and n2−1 .

To find: The critical value tα/2 .

To find: The 95% confidence interval.

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