David is a statistician. he has a sample size of 40 (which he cannot change). what element of his hypothesis test can he adjust to minimize the probability that he incorrectly rejects the null hypothesis?

Step-by-step explanation:

Given that David is a statistician. He has a sample size of 40 (which he cannot change).

Margin of error for confidence interval = critical value * std dev/sq rt n.

Hence he must have confidence interval maximum width to minimize the probability that he incorrectly rejects the null hypothesis.

For the confidence interval to be wider, margin of error should be large,

For this either critical value should be large or sample siz should be large or both.

Hence answer is

i) 99% confidence instead of 95% confidence to be used

ii) Sample size should be increased.

The correct answer is D.

dd

step-by-step explanation:

dd