Question

1. A car company advertises that their new Minivan averages 31 mpg. You randomly select 8 minivans off the lot and test gas millage under similar conditions. The following data you collect (in mpg): 30, 28, 32, 26, 33, 25, 28, 30

Does the actual gas milleage significantly deviate from the 31 mpg reported? Test at alpha = 0.05. This is a (t) test problem

Answer 1

Number	Values (X )
1	30	1
2	28	1
3	32	9
4	26	9
5	33	16
6	25	16
7	28	1
8	30	1
Total	232	54

Mean   

Standard deviation  

To Test :-

H₀ :-  

H₁ :-  

Test Statistic :-

Test Criteria :-

Reject null hypothesis if   

= 2.035 < 2.365, we fail to reject null hypothesis

Conclusion :- Accept Null Hypothesis

There is no sufficient evidence to conclude that there is statistically significant in the deviation of milleage of 31 mpg.

The claim is tru that A car company advertises that their new Minivan averages 31 mpg.