Question

In finding the areas under the normal curve, if we wish to determine the area above A, and A is greater than the mean, we?

A) we find the area below A on the positive Z table and subtract it from .5000

. B) we find the area below A on the positive Z table and subtract it from 1.000.

C) the positive Z table gives us the area above A

D) we find the area below A on the negative Z table

In finding the areas under the normal curve, if we wish to determine the area below A, and A is greater than the mean, we ?

A) we find the area below A on the positive Z table and subtract it from .5000.

B) we find the area below A on the positive Z table and subtract it from 1.000.

C) the positive Z table gives us the area belowA

D) we find the area below A on the negative Z table

In constructing a confidence interval estimate of the population mean you decide to select 49 random observations to get your point estimate of the mean (sample mean). Your friend is also constructing a similar confidence interval estimate but decides to use a sample size of 36 random observations. Which of the following is true?

	A.	Your friend’s confidence interval estimate has a greater degree of confidence.
	B.	Your confidence interval estimate has a greater degree of confidence.
	C.	Your confidence interval estimate is narrower.
	D.	Your confidence interval estimate is wider. The width of a confidence interval estimate for a proportion will be: a. Narrower for 99% confidence level than for a 95% confidence level b. Wider for a sample size of 100 than for a sample size of 75 c. Narrower for 90% confidence level than for a 95% confidence level d. Narrower when the sample proportion is .50 than when the sample proportion is .20

Answer 1

In finding the areas under the normal curve, if we wish to determine the area above A, and A is greater than the mean, we?-

B) we find the area below A on the positive Z table and subtract it from 1.000.

In finding the areas under the normal curve, if we wish to determine the area below A, and A is greater than the mean, we ?-

C) the positive Z table gives us the area below A

In constructing a confidence interval estimate of the population mean you decide to select 49 random observations to get your point estimate of the mean (sample mean). Your friend is also constructing a similar confidence interval estimate but decides to use a sample size of 36 random observations. --

C) Your confidence interval estimate is narrower.... - Confidence Interval is inversely proportional to the sample size.

The width of a confidence interval estimate for a proportion will be:---

C) Narrower for 90% confidence level than for a 95% confidence level

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