Author Question: What is a 90 confidence interval for the population mean if the test scores on a 100-point test ... (Read 180 times)

abc · **on:** Jun 24, 2018

What is a 90 confidence interval for the population mean

if the test scores on a 100-point test were recorded for the following 5 students? Scores for the five students were: 95, 85, 80, 70, and 90.

a.(70, 95)
b.(72.06, 95.94)
c.(74.83, 93.17)
d.(75.23, 92.77)

Question 2

If a random sample of size n = 25 is taken from a continuous and symmetric distribution with a mean

, which of the following would be an unbiased estimator for

?

a.the median,

b.All of these answers.
c.the trimmed mean,

d.the mean,

strudel15 · **Reply #1 on:** Jun 24, 2018

Answer to Question 1

correct: c

Answer to Question 2

correct: b

abc · **Reply 2 on:** Jun 24, 2018

Thanks for the timely response, appreciate it

xiaomengxian

Excellent