87 una within ± 0.075 of the pop 10 days if no previous estimate is available? 2. The quality control manager at a light bulb factory needs to determine whether the average life of a large shipment of light bulbs is equal to the specified value of 475 hours. The process standard deviation is known to be 200 hours. A random sample of 64 light bulbs indicates a sample mean life of 450 hours. At the 0.01 level of significance, is there evidence that the mean life is different from 475 hours? a. State the null and alternative hypothesis b. Is it a two-tail test or one-tail test? c. Write the test Statistic (Z or T)? d. State the critical value(s) e. State the conclusion (Reject Ho or Do not reject Ho) f. State the conclusion as a relationship to the problem. I
87 una within ± 0.075 of the pop 10 days if no previous estimate is available? 2. The quality control manager at a light bulb factory needs to determine whether the average life of a large shipment of light bulbs is equal to the specified value of 475 hours. The process standard deviation is known to be 200 hours. A random sample of 64 light bulbs indicates a sample mean life of 450 hours. At the 0.01 level of significance, is there evidence that the mean life is different from 475 hours? a. State the null and alternative hypothesis b. Is it a two-tail test or one-tail test? c. Write the test Statistic (Z or T)? d. State the critical value(s) e. State the conclusion (Reject Ho or Do not reject Ho) f. State the conclusion as a relationship to the problem. I
Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter13: Probability And Calculus
Section13.3: Special Probability Density Functions
Problem 7E
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Transcribed Image Text:87
una
within ± 0.075 of the pop
10 days if no previous estimate is available?
2. The quality control manager at a light bulb factory needs to determine whether
the average life of a large shipment of light bulbs is equal to the specified value
of 475 hours. The process standard deviation is known to be 200 hours. A
random sample of 64 light bulbs indicates a sample mean life of 450 hours. At
the 0.01 level of significance, is there evidence that the mean life is different
from 475 hours?
a. State the null and alternative hypothesis
b. Is it a two-tail test or one-tail test?
c. Write the test Statistic (Z or T)?
d. State the critical value(s)
e. State the conclusion (Reject Ho or Do not reject Ho)
f. State the conclusion as a relationship to the problem.
I
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