An airline company would like to know if the average number of passengers on a f

Question

An airline company would like to know if the average number of passengers on a flight in November is less than the average number of passengers on a flight in December. The results of random sampling are printed below.

November n1= 75 x1bar= 476 s1=9

December    n2= 80 x2bar= 482 s2=7

Which test should be used?

Z test

T test for the difference between two means

Z test for the difference between two means

T test

4 points   

QUESTION 20

While testing the null and alternate hypothesis:
H0: mu=50 vs. Ha:mu not equal 50
n=100
p-value = 0.0357
alpha = 0.05

What is the correct decision?

Reject Ha

Do not reject H0

Reject H0

none of these

Z test

T test for the difference between two means

Z test for the difference between two means

T test

Explanation / Answer

Question 19:

(B) T test for the difference between two means

Explanation: Since the varaince of the two distributions are unknown t test for difference of two means seems to be appropriate

Question 20:

(C) Reject H0

since the p-value is less than alpha, we reject the null

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