Sample annual salaries (in thousands of dollars) for employees at a company are listed. (a) Find the sample mean and sample standard deviation. (b) Each employee in the sample is given a % raise. Find the sample mean and sample standard deviation for the revised data set. (c) To calculate the monthly salary, divide each original salary by 12. Find the sample mean and sample standard deviation for the revised data set. (d) What can you conclude from the results of (a), (b), and (c)?

Follows are the solution to the given points:

Step-by-step explanation:

The value is attached in the image file please find it.

In point a:

First, we calculate the find the mean,

Formula:

To calculate the standard deviation, subtract the mean value from all observations then square its value:

please find attached file

In point b:

New

Calculate new mean:

calculating the standard deviation:

please find attached file

In point C:

Calculate new mean:

calculating the standard deviation:

please find attached file

In point d:

for b,

New

New

for c,

New

New