# Chapter 1. The One-Sample t Test

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Stat Tutor
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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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3:18

### Question 1.2

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.
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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.
2

4:57

### Question 1.4

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

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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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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9:11

### Question 1.7

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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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.
2

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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11:54