Question

This quiz covers "Matched Pairs" in the last part of Section 7.1 and is due at 9:00 PM on Tuesday April 7.

You will have two attempts at this quiz. I suggest you do all of them first on paper. After the first attempt, you should write down which ones you answered correctly and which one incorrectly, as well as any hints that were given. Then re-solve the problems and take the quiz a second time. Note that the responses will appear in a different order the second time you take the quiz. Correct answers will appear on Canvas, twenty four hours after the quiz is due.

By submitting this quiz you affirm you did not receive any help from anyone in completing the quiz, except for clarifications provided by the instructor.  Using the videos, textbook and handbook is acceptable.

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Question 11 pts

In a matched pairs study, all the following are true, EXCEPT:

Group of answer choices

The paired values are unrelated.

Cause-and-effect conclusions can be reached if there are no confounding variables.

The "differences are the data".

The pair of values must represent the same concept and be on the same scale.

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Question 21 pts

Questions 2 through 10 are based on Exercise #7.40 on IPS p. 430. The Jocko's Garage problem is the same as "Rocky's Garage" on HB p. 8, except with different values, so follow the Rocky's example.

#40a) Compute the ten differences (Diff = Jocko - Other). Then compute the mean (x-bar) of the ten differences: The sample mean (x-bar) is:

Group of answer choices

125

107

114

119

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Question 31 pts

#40a) The standard deviation of the ten differences is s = 114.40 .

What is the standard error for this problem? (You may wish to review the definition of  standard error on HB p. 4.)

Group of answer choices

26.83

38.13

11.44

36.18

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Question 41 pts

#40b) Insurance adjusters are concerned that Jocko's estimates are higher than they should be . Given this suspicion, and assuming the "Other" garage charges fair prices, what are the correct null and alternative hypotheses for this test?

Group of answer choices

Ho; mu = 0; Ha: mu does not equal 0

Ho; mu < 0; Ha: mu > 0

Ho; mu = 0; Ha: mu > 0

Ho; mu = 0; Ha: mu < 0

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Question 51 pts

#40b) What is the value of the t-score for this test?

Group of answer choices

3.151

4.249

2.990

9.965

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Question 61 pts

#40b) What are the degrees of freedom (df) for this t statistic?

Group of answer choices

10

19

20

9

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Question 71 pts

#40b) Between what two values does the P-value of the test fall?

Group of answer choices

.01 and .02

.005 and .01

less than .0005

.0025 and .005

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Question 81 pts

#40b) What is the correct conclusion for this hypothesis test?

Group of answer choices

At the .05 level there is evidence that, on average, Jocko charges less than the other garage.

At the .05 level there is evidence that, on average, Jocko charges a differing amount than the other garage.

At the .05 level there is not evidence that, on average, Jocko charges more than the other garage.

At the .05 level there is evidence that, on average, Jocko charges more than the other garage.

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Question 91 pts

#40c) What is the t* value needed to construct a 95% confidence interval for the mean difference?

Group of answer choices

2.306

2.080

2.086

2.262

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Question 101 pts

#40c) What is the correct margin of error for this confidence interval?

Group of answer choices

85.76

78.43

81.83

72.56

Answer 1

Question 11 pts

In a matched pairs study, all the following are true, EXCEPT:

The paired values are unrelated.