Question

Aptitude tests should produce scores with a large amount of variation so that the administrator can distinguish between persons with low aptitude and persons with high aptitude. The standard test used by a certain industry has been producing scores with a standard deviation of 5 points. A new test is tried on 20 prospective employees and produce a sample standard deviation of 8 points. Are scores from the new test significantly more variable than scores from the standard? (Use alpha = 0.05)

NOTE:

1) Please be overly thorough in the explanation.

2) Please draw a picture of the graph with variables and their calculate values.

3) Please do not use any statistical software, written work only.

Answer 1

olution > as Ha: test statistic The (20-)x64 48.69 19 P-Value z 0:00o &07 P-Value P-Value zo.05 The sgnifiant e sult is at P a =0.05 Reject Ho Concusion;. The data Provide suff'cient evidence Sign ficantly that test is more Vaviable new standand Score from the than sapned with CamScarner