Indicate those procedures that DECREASE the width of a confidence interval (you
ID: 3218495 • Letter: I
Question
Indicate those procedures that DECREASE the width of a confidence interval (you may select more than one). Increase the sample size Decrease the sample size Increase alpha Decrease alpha Increase the level of confidence Decrease the level of confidence You find that the average income for college students is $20,000 +/- $200 (with a confidence level of 95%). Indicate the CORRECT interpretation(s) of this finding below (you may select more than one). I am 95% certain that the average income for college students is $20,000. If the same sampling and statistical procedures are conducted 100 times, 95 times the true population mean will be encompassed between $19, 800 and $20, 200 (and 5 times it will not). 5% of college students make less than $19, 800. 95% of college students make more than $20, 200. I am 95% sure that the average income of college students is between $19, 800 and $20, 200.Explanation / Answer
Solution :-
7) option a. , c., f.
a. Increase the sample size
c. Increase alpha
f. Decrease the level of confidence
Explanation:- confidence interval: x ± Za/2 * /(n). Here, x represents the mean.
8) option b. , e.
=> b. If the same sampling and statistical procedures are conducted 100 times, 95 times the true population mean will be encompassed between $19,800 and $20,200 (and 5 times it will not).
=> e. I am 95% sure that the average income of college students is between $19,800 and $20,200.