Chapter 1. The One-Sample t Confidence Interval

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1:36

Question 1.1

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Incorrect. We use t*, not z* as the multiplier in a confidence interval estimate of µ when σ is unknown.
Correct. We use t*, not z* as the multiplier in a confidence interval estimate of µ when σ is unknown.
Incorrect. Try again.
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2:38

Question 1.2

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Incorrect. Most of the values on the t table are t* values. A particular t* value is found in the intersection of the appropriate level of confidence column and the appropriate degrees of freedom row.
Correct. Most of the values on the t table are t* values. A particular t* value is found in the intersection of the appropriate level of confidence column and the appropriate degrees of freedom row.
Incorrect. Try again.
2

3:21

Question 1.3

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Incorrect. Find the df closest to the actual without going over the actual.
Correct. Find the df closest to the actual without going over the actual.
Incorrect. Try again.
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5:56

Question 1.4

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Incorrect. Basically, we use the t table and t-values rather than standard Normal values.
Correct. Basically, we use the t table and t-values rather than standard Normal values.
Incorrect. Try again.
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6:39

Question 1.5

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Incorrect. The parameter estimated with a one-sample t procedure is the mean response of all individuals. In this case, the parameter is the mean resting pulse rate of all male students.
Correct. The parameter estimated with a one-sample t procedure is the mean response of all individuals. In this case, the parameter is the mean resting pulse rate of all male students.
Incorrect. Try again.
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7:27

Question 1.6

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Incorrect. There are no observations were you would say, “Oh, wow!! That’s an outlier!”
Correct. There are no observations were you would say, “Oh, wow!! That’s an outlier!”
Incorrect. Try again.
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7:43

Question 1.7

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Incorrect. The sample size is 92 and the data were collected with an SRS, so yes, we can apply the Central Limit Theorem.
Correct. The sample size is 92 and the data were collected with an SRS, so yes, we can apply the Central Limit Theorem.
Incorrect. Try again.
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7:50

Question 1.8

Incorrect. Since we don’t know σ and will use s to estimate it, we need to use the formula with t*.
Correct. Since we don’t know σ and will use s to estimate it, we need to use the formula with t*.
Incorrect. Try again.
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8:12

Question 1.9

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Incorrect. Use the closest df without going over. 80 is the closest to 91 that is still smaller than 91 so we use 80 df to find t*.
Correct. Use the closest df without going over. 80 is the closest to 91 that is still smaller than 91 so we use 80 df to find t*.
Incorrect. Try again.
2

9:06

Question 1.10

Incorrect. 2.28 is the margin of error.
Correct. 2.28 is the margin of error.
Incorrect. Try again.
2

Question 1.11

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Incorrect. “We are 95% confident that” gives confidence. “The true mean resting pulse rate for all male students” states the parameter in context.
Correct. “We are 95% confident that” gives confidence. “The true mean resting pulse rate for all male students” states the parameter in context.
Incorrect. Try again.
2

9:20