Question 11 (5 points) The mean age of principals in a local school district is

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Question 11 (5 points)

The mean age of principals in a local school district is 50.2 years. If a hypothesis test is performed, how should you interpret a decision that rejects the null hypothesis?

Question 11 options:

There is not sufficient evidence to reject the claim = 50.2.

There is sufficient evidence to support the claim = 50.2.

There is sufficient evidence to reject the claim = 50.2.

There is not sufficient evidence to support the claim = 50.2.

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Question 12 (5 points)

The difference between the observed and predicted value of the response variable is a ___________.

Question 12 options:

variance

residual

standard error of the estimate

test statistic

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Question 13 (5 points)

If we are interested in determining whether a relationship exists, we employ correlation analysis

Question 13 options:

True

False

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Question 14 (5 points)

The least-squares regression model for one independent variable is given by the equation

Question 14 options:

y = mx +b + c

y - yi = m(x - xi)

yi =(Ai/Bi) xi + Ci

yi = 0 + 1xi + i

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Question 15 (5 points)

The ages of a group of patients being treated at one hospital for osteoporosis are summarized in the frequency histogram below. Based on the histogram, is a large sample necessary to conduct a hypothesis test about the mean age? If so,why?

Question 15 options:

No; data appear to be normally distributed with no outliers.

Yes; data do not appear to be normally distributed but skewed right.

Yes; data do not appear to be normally distributed but skewed left.

Yes; data do not appear to be normally distributed but bimodal.

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Question 16 (5 points)

A local eat-in pizza restaurant wants to investigate the possibility of starting to deliver pizzas. The owner of the store has determined that home delivery will be successful if the average time spent on the deliveries does not exceed 32 minutes. The owner has randomly selected 23 customers and has delivered pizzas to their homes in order to test if the mean delivery time actually exceeds 32 minutes. Suppose the P-value for the test was found to be 0.0298. State the correct conclusion

Question 16 options:

At = 0.025, we fail to reject H0.

At = 0.02, we reject H0.

At = 0.05, we fail to reject H0.

At = 0.03, we fail to reject H0.

Explanation / Answer

Question 11 (5 points)

The mean age of principals in a local school district is 50.2 years. If a hypothesis test is performed, how should you interpret a decision that rejects the null hypothesis?

Ans : There is sufficient evidence to reject the claim = 50.2

Question 12 (5 points)

The difference between the observed and predicted value of the response variable is a ___________.

Ans : Residual

Question 13 (5 points)

If we are interested in determining whether a relationship exists, we employ correlation analysis

Ans ; True

Question 14 (5 points

The least-squares regression model for one independent variable is given by the equation

Ans: y = mx +b + c

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