A consumer group plans to test whether a car gets at least 28 MPG. They will...
A consumer group plans to test whether a car gets at least 28 MPG. They will test the hypothesis using a significance level of 0.05 and a sample size of n = 121 cars. Assume the population standard deviation is 6 mpg and the sample resulted in a mean of 26.2 MPG. Calculate the test statistic.
t= -3.3
t= -1.658
z= -1.645
z= -3.3
Homework Answers
solutiom
The null and alternative hypothesis is ,
H0 : 
= 28
Ha :
> 28
Test statistic = z
= (
- 
) / 
/ 
n
= (26.2-28) / 6/
121
z= -3.3
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A consumer group plans to test whether a car gets at least 28
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