Question

A company manufactures light bulbs. The company wants the bulbs to have a mean life span of 990 hours. This average is maintained by periodically testing random samples of 16 light bulbs. If the t-value falls between minus t 0.99 and t 0.99, then the company will be satisfied that it is manufacturing acceptable light bulbs. For a random sample, the mean life span of the sample is 1007 hours and the standard deviation is 28 hours. Assume that life spans are approximately normally distributed. Is the company making acceptable light bulbs? Explain. The company ▼ is is not making acceptable light bulbs because the t-value for the sample is t = nothing and t = 0.99 = nothing. (Round to two decimal places as needed.) .

Answer #1

A company manufactures light bulbs. The company wants the bulbs
to have a mean life span of
999999
hours. This average is maintained by periodically testing random
samples of
2525
light bulbs. If the t-value falls between
minus−t 0.95t0.95
and
t 0.95t0.95,
then the company will be satisfied that it is manufacturing
acceptable light bulbs. For a random sample, the mean life span of
the sample is
10061006
hours and the standard deviation is
2222
hours. Assume that life spans...

A company manufactures light bulbs. The company wants the bulbs
to have a mean life span of 999 hours. This average is maintained
by periodically testing random samples of 25 light bulbs. If the
t-value falls between minus−t 0.95 and t 0.95 then the company will
be satisfied that it is manufacturing acceptable light bulbs. For a
random sample, the mean life span of the sample is 1006 hours and
the standard deviation is 22 hours. Assume that life spans...

An electrical firm manufactures light bulbs that have a length
of life that is normally distributed, with mean equal to 800 hours
and a standard deviation of 40 hours. Suppose a 100 light bulbs are
randomly selected for testing the length of life. Let x ̅ represent
the sample mean length of life of the light bulbs.
σ_( x ̅ ) = 4 hours
n) Find a lower and an upper mean length of life of bulbs in
hours such...

A manufacturer receives an order for fluorescent light bulbs.
The order requires that the bulbs have a mean life span of 950
hours. The manufacturer selects a random sample of 25 fluorescent
light bulbs and finds that they have a mean life span of 945 hours
with a standard deviation of 15 hours. Test to see if the
manufacturer is making acceptable light bulbs. Use a 95% confidence
level. Assume the data are normally distributed.

The life span of 100 W light bulbs manufactured by a company are
tested. It is found that (2%) of the light bulbs are rejected. A
random sample of 15 bulbs is taken from stock and tested. The
random variable X is the number of bulbs that is rejected.
If life span of light bulbs is adjusted so that the mean now is
?. Find the value of ?:
i. Given that ?(? = 0) = 0.25.
ii. Given that...

an electrical firm manufactures light bulbs that have a length
of life that is approximately normally distributed with a standard
deviation of 40 hours. the firm claims that the mean life of the
light bulb is 800 hrs
a?if a sample of 30 light bulbs were tested to failure and had
an avg life of 780 hours, find 90% confidence interval on the
mean
b) based on this confidence interval, would you be able to
validate the claimed mean life...

An electrical firm manufactures light bulbs that have a lifetime
that is approximately normally distributed with a mean of 800 hours
and a standard deviation of 40 hours. Test the claim, at the 0.05
level of significance, if a random sample of 30 bulbs has an
average life of 790 hours. Also, Find P-value

A company manufacturing light bulbs is testing a new model. The
company claims that the mean life time is less than 1000 hours.
A sample of 16 light bulbs are found to have sample mean of
987.5 hours and a sample variance of 400.
(a) Test this claim at the significance level α = 0.02.

1) An electrical firm manufactures light bulbs that have a
length of life that is approximately normally distributed with a
standard deviation of 40 hours. If a sample of 36 bulbs has an
average life of 780 hours, calculate the 95% confidence interval
for the population mean of all bulbs produced by this firm
2) Is it true that the confidence interval is narrower for 95%
confidence than for 90% confidence? Explain
3) Is it true that the Sample means...

An electrical firm manufactures light bulbs that have a length
of life that is approximately normally distributed with a standard
deviation of 40 hours. If a sample of 30 bulbs has an average life
of 780 hours, construct a 96% confidence interval for the
population mean of all bulbs produced by this firm.
Identifying all the required quantities correctly from
problem statement = 5 points
Sketch the probability/ area on normal PDF curve = 5
points
Calculate the z value...

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