Question

Question A: At α=.05 test the claim that the averagelife time of car batteries prododuced by company X is the same as those produced by company Y. A sample of 20 car batteries from company X had a mean life time of 45 months and SD 2 months while a sample of 30 car batteries from company Y had a mean life time of 47 months and SD 2.5 months.

Sovle for:

1 st for σ1= σ2

Test Stat=F=

p-value=

accept σ1= σ2

2 nd Claim

H0

Ha

Test Stat

p-value

Question B: A manufacturer claims that less than 4% of his produced items are defective. In a random sample of 300 items, 11 were defective. At α=0.05, test the manufacturer claim.

Claim

H0

Ha

Test Statistic=

p-value=

Result:

Answer 1