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(Solved): Question 20 Employees at construction and mining company claim that mean salary of the company's mec ...
Question 20
Employees at construction and mining company claim that mean salary of the company's
mechanical engineers is less than that of one its compotators, which is $68000. A random
sample of 20 of the company's mechanical engineers has a mean salary of $66,900. Assume
that the population's standard deviation is $5500 and the population is normally distributed,
At \alpha =0.05, test the employee's claim.
Set up a null and alternative hypothesis and identify the claim
Null: mean is greater than or equal to $68000 and Altemative: mean> $68000 (claim)
Null: mean is greater than or equal to $68000 and Altemative: mean< $68000 (claim)
Null: mean is less than or equal to $68000 and Altemative: mean> $68000 (claim)
Null: mean -$68000 and Alternative: mean is not equal to $68000 (claim)
Question 21
For the same description in problem #20 perform the Z test of the mean and find the Z score:
-1.89
1.89
0.89
-0.89
Question 22
For the same description in problem #20, find the Z score at \alpha =0.05
1.65
0.65
-1.65
1.65