30. For a 95% confidence level, given n is the sample size, 3 is the margin of e

Question

30. For a 95% confidence level, given n is the sample size, 3 is the margin of error, and 7 is the sample mean, what is the appropriate confidence interval?

a.

[4, 10] is the 95% confidence interval.

b.

The width of the confidence interval should be equal to the margin of error.

c.

If you decrease the confidence level, the margin of error should be larger.

d.

If you decrease the sample size, then at the 95% confidence level, the margin of error should decrease.

34. One of the properties of the mean as a measure of central tendency is that the sum of the deviation [?(X – X)] should always equal:

a.

1

b.

–1

c.

0

d.

0.5

a.

[4, 10] is the 95% confidence interval.

b.

The width of the confidence interval should be equal to the margin of error.

Explanation / Answer

30)as confidence interval =sample mean -/+ margin of error =7- /+3 =4 ; 10

option A is correct

34)

[?(X – X)] =0

option C

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