Chapter 1. The One-Sample t Test

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Question 1

1:45

Question 1.1

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Incorrect. Always use the t table to find P-value whenever s is used to estimate µ.
Correct. Always use the t table to find P-value whenever s is used to estimate µ.
Incorrect. Try again.
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Question 2

3:18

Question 1.2

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Incorrect. Because Ha is µ > 31, this is a one-sided test.
Correct. Because Ha is µ > 31, this is a one-sided test.
Incorrect. Try again.
2

Question 3

3:46

Question 1.3

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Incorrect. Using statistical software gives more accurate P-values than a t table.
Correct. Using statistical software gives more accurate P-values than a t table.
Incorrect. Try again.
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Question 4

4:57

Question 1.4

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Incorrect. The P-value is smaller than the smallest probability on the “One-sided P” row when the test statistic value is off the t chart on the right. If the test statistic number is off the chart on the left, P-value is larger than the largest probability on the “One-sided P” row.
Correct. The P-value is smaller than the smallest probability on the “One-sided P” row when the test statistic value is off the t chart on the right. If the test statistic number is off the chart on the left, P-value is larger than the largest probability on the “One-sided P” row.
Incorrect. Try again.
2

Question 5

5:57

Question 1.5

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Incorrect. Because Ha is µ ≠ 31, this is a two-sided test.
Correct. Because Ha is µ ≠ 31, this is a two-sided test.
Incorrect. Try again.
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Question 6

7:41

Question 1.6

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Incorrect. Whenever we use s to estimate σ, we must use the t table.
Correct. Whenever we use s to estimate σ, we must use the t table.
Incorrect. Try again.
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Question 7

9:11

Question 1.7

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Incorrect. Since we want to determine if the mean is “different from”, we want “≠” in Ha.
Correct. Since we want to determine if the mean is “different from”, we want “≠” in Ha.
Incorrect. Try again.
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Question 8

10:28

Question 1.8

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Incorrect. df = n – 1 = 92 – 1 = 91
Correct. df = n – 1 = 92 – 1 = 91
Incorrect. Try again.
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Question 9

11:20

Question 1.9

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Incorrect. Since p is less than alpha we reject H0.
Correct. Since p is less than alpha we reject H0.
Incorrect. Try again.
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Question 10

11:54

Question 1.10

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Incorrect. When we do not reject H0, we do not have evidence to say that Ha is correct. On the other hand, neither do we have evidence to say that H0 is correct. The best we can do is estimate the value of µ with a confidence interval.
Correct. When we do not reject H0, we do not have evidence to say that Ha is correct. On the other hand, neither do we have evidence to say that H0 is correct. The best we can do is estimate the value of µ with a confidence interval.
Incorrect. Try again.
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