Question
Microsoft Excel was used on a set of data involving the number of defective items found in a random sample of 46cases of lightbulbsproduced during
Microsoft Excel was used on a set of data involving the number of defective items found in a random sample of 46cases of lightbulbsproduced during a morning shift at a plant. A manager wants to know if the mean number of defective light bulbs is greater than 20 during the morning shift. She will make her decision using a test with a level of significance of .10. The following information was extracted from the Microsoft Excel output:
n = 46
Mean = 28.00, Standard deviation: 25.92
Standard Error = 3.82
Null hypothesis: H0: 20
=0.10
df= 45
T test statistic = 2.09
One Tail upper critical value = 1.3006
p value = 0.021
What should the manager decide?
A. Reject the null
B. Do not reject the null
C. Accept the null
D. Not enough information provided
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