Author Question: If a researcher wishes to increase the confidence level from 95 to 99, what approximately will be ... (Read 66 times)

segrsyd · **on:** Jun 29, 2018

If a researcher wishes to increase the confidence level from 95 to 99, what approximately will be the effect on sample size?
a. The sample size will decrease in proportion to the increase in the confidence level.
b. The ratio of the new sample size to the old is 3/2.
c. The ratio of the new sample size to the old is 2/3.
d. The ratio of the new sample size to the old is 9/4.
e. The ratio of the new sample size to the old is 4/9.

Question 2

If the desired level of confidence to estimate a mean is increased from 90 (with z = 1.60) to 95, the sample size is increased by a factor of __________, all else equal.
a. 2.50
b. 4.65
c. Has no effect on sample size.
d. 1.56
e. 2.00