i am using minitab to solve the problem.
steps :-
copy the data in minitab and name the column x stat basic statistics 1-sample T select summarized data from the drop down menu type 3 in sample size, 50000 in sample mean,20 in standard deviation tick perform hypothesized test in hypothesized mean type 80000 options in confidence level type 90 select alternative hypothesis as mean < hypothesized mean okok.
***SOLUTION***
here, we will do 1 sample t test for mean as the population variance is unknown and sample size(n) = 3<30.
hypothesis:-
[ claim ]
the test statistic (t) = -2598.08
p value = 0.000
decision:-
p value = 0.000< 0.10(alpha)
we reject the null hypothesis. There is enough evidence that the average salary of all entry level computer engineer is less than 80000.
*** if you have any doubt regarding the problem ,please write it in the comment box...if satisfied,please UPVOTE.
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