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In: Statistics and Probability

Sample annual salaries​ (in thousands of​ dollars) for employees at a company are listed. 42   51 ...

Sample annual salaries​ (in thousands of​ dollars) for employees at a company are listed.

42  

51 

57 

47  

41 

41  

42 

51  

57  

31 

47 

42 

46

  

​(a) Find the sample mean and sample standard deviation.

​(b) Each employee in the sample is given a

55​%

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)?

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