Eric is comparing the credit scores of his friends. the scores he gathered are found in the list below.
-588
-838
-691
-818
-846
-725
-605
-732
-750
among this batch of credit scores, find whether the mean or the median is higher, and how much higher it is. (round to the nearest whole point, if applicable.)
a.
the mean is 113 points higher than the median.
b.
the mean is 1 point higher than the median.
c.
the median is 15 points higher than the mean.
d.
the median is 8 points higher than the mean.

Arandom sample of 15 observations is used to estimate the population mean. the sample mean and the standard deviation are calculated as 172 and 63, respectively. assume that the population is normally distributed. a. with 99 confidence, what is the margin of error for the estimation of the population mean? b. construct the 99% confidence interval for the population mean. c. construct the 95% confidence interval for the population mean. d. construct the 83% confidence interval for the population mean. hint: you need to use excel function =t.inv.2t to find the value of t for the interval calculation.