Author Question: A sample of 75 information systems managers had an average hourly income of 40.75 with a standard ... (Read 113 times)

fahad · **on:** Jun 24, 2018

A sample of 75 information systems managers had an average hourly income of 40.75 with a standard deviation of 7.00 . The 95 confidence interval for the average hourly wage (in ) of all information system managers is
a. 38.61 to 42.89.
b. 39.40 to 42.10.
c. 39.14 to 42.36.
d. 37.54 to 43.96.

Question 2

For the Wilcoxon signed-rank test,
a. differences of 0 are discarded.
b. there are no assumptions made about the population distribution.
c. a skewed population is preferred.
d. ties among absolute differences are assigned positive signed ranks.