Question

The quality-control manager at a compact fluorescent light bulb factory need to determine whether the mean life of a large shipment of bulbs is equal to 7,500 hours. The population standard deviation is 1,000 hours. A random sample of 64 bulbs indicates a sample mean life of 7,250 hours.

1. Set the hypothesis, for matching this statement “Is there
evidence that the mean life is difference from 7,500 hours?”

2. At 95% confidence, what is the estimation of population mean
life of the bulbs?

3. Compute p-value.

4. Find the solution, by using level of significance = 0.05.

Answer #1

The quality control manager at a compact fluorescent light bulb
(CFL) factory needs to determine whether the mean life of a larger
shipment of CFL is equal to 7,500 hours.
The population standard deviation is 1,200 hours.
A random sample of 64 CFLs indicates a sample mean life of 7,250
hours.
At the 0.05 level of significance, is there evidence that the
mean life is different from 7,500 hours?

The quality-control manger at a compact fluorescent light bulb
(CFL) factory needs to determine whether the mean life of a large
shipment of CFLs is equal to 7,500 hours. The population standard
deviation is 1,000 hours. A random sample of 64 CFLs indicates a
sample mean life of 7,250.
a) At the 0.05 level of significance, is there evidence that the
mean life is different from 7,500 hours?
b) Complete the p-value and interpret its meaning.
c) Construct a 95%...

The quality-control manager at a compact fluorescent light
bulb (CFL) factory needs to determine whether the mean life of a
large shipment of CFLs is equal to
7,463 hours. The population standard deviation is 100 hours. A
random sample of 64 light bulbs indicates a sample mean life of
7,438 hours.
a. At the 0.05 level of significance, is there
evidence that the mean life is different from 7,463 hours?
b. Compute the p-value and interpret its
meaning.
c. Construct...

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indicates a sample mean life of 7,507 hours.
a. At the 0.05 level of significance, is there evidence that
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What is/are the critical values?
b. Compute the p-value...

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shipment of CFLs is equal to 7506 hours. the population standard
deviation is 900 hours. a random sample of 81 light bulbs indicates
a sample mean life of 7256 hours
A at the 0.05 level of significance, is there evidence that the
mean life is different from 7506 hours
B compute the p value and interpret its meaning
C...

The quality-control manager at a compact fluorescent light
bulb (CFL) factory needs to determine whether the mean life of a
large shipment of CFLs is equal to 7,499 hours. The population
standard deviation is 100 hours. A random sample of 64 light bulbs
indicates a sample mean life of 7,474 hours.
a. At the 0.05 level of significance, is there evidence that
the mean life is different from 7,499 hours?
b. Compute the p-value and interpret its meaning.
c. Construct...

The quality-control manager at a compact fluorescent light
bulb (CFL) factory needs to determine whether the mean life of a
large shipment of CFLs is equal to 7540 hours. The population
standard deviation is 735 hours. A random sample of 49 light bulbs
indicates a sample mean life of 7,288 hours.
Construct a 95% confidence interval estimate of the population
mean life of the light bulbs?
___ <= MU <= ___ (Round to the nearest whole number as
needed.)

The quality-control manager at a compact fluorescent light
bulb (CFL) factory needs to determine whether the mean life of a
large shipment of CFLs is equal to
7,538 hours. The population standard deviation is 92 hours. A
random sample of 6464 light bulbs indicates a sample mean life of
7,515 hours.
a. At the 0.05 level of significance, is there evidence that
the mean life is different from 7,538 hours?
b. Compute the p-value and interpret its meaning.
c. Construct...

The quality-control manager at a compact fluorescent light
bulb (CFL) factory needs to determine whether the mean life of a
large shipment of CFLs is equal to 7520 hours. The population
standard deviation is 840 hours. A random sample of 64 light bulbs
indicates a sample mean life of 7,258 hours.
a. At the 0.05 level of significance, is there evidence that
the mean life is different from 7520 hours?
b. Compute the p-value and interpret its meaning.
c. Construct...

The
operations manager at a compact fluorescent light bulb (CFL)
factory needs to estimate the mean life of a large shipment of
CFLs. The manufacturer’s specifications are that the standard
deviation is 1,000 hours. A random sample of 64 CFLs indicated a
sample mean life of 7,500 hours.
a.
Construct a 95% confidence interval estimate for the population
mean life of compact fluorescent light bulbs in this
shipment.
b. Do
you think that the manufacturer has the right to state...

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