Share
Explore BrainMass

Null Hypothesis Sample Deviation Effects

2)Your company has recently changed suppliers of a certain raw material in an effort to reduce the number of defective units being produced at your plant. During the past year, the sampling has indicated a daily mean of 21.2 defective units. After testing the new suppliers raw materials for 30 days, it was found that the mean during the trial period was 19.8 with a sample deviation of 5. Testing at the 5% level of significance, has the change in suppliers had the desired effect?

Complete the following

H0:  =

H1: 

Alpha =

St. error =

n =

sample mean =

Calculations leading to your conclusion:

Final answer:

6.How does changing the alpha value affect the width of the confidence interval?

7.How does increasing the sample size affect the width of the confidence interval?

Solution Preview

Please see the attached file.

2) Your company has recently changed suppliers of a certain raw material in an effort to reduce the number of defective units being produced at your plant. During the past year, the sampling has indicated a daily mean of 21.2 defective units. After testing the new suppliers' raw materials for 30 ...

Solution Summary

The expert examines null hypothesis sample deviation effects. The sample mean effects are provided.

$2.19