What is a 90 confidence interval for the population mean if ...

[abc]

  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]

Answer to Question 1

correct: c

Answer to Question 2

correct: b

[abc]

Excellent

[epscape]

Thanks for the timely response, appreciate it