Question

Osmar Ltd conducted a study to determine the lifetimes of the light bulbs produced by their Melbourne plant. Based on studies in other plants, it could be assumed that the variance of the lifetimes was 110000 hours squared. Experimental testing of 59 light bulbs yielded an average lifetime of 19.3 hundred hours. Based on this evidence, construct a 92% confidence interval for the average lifetime of the bulbs produced in Osmar's Melbourne plant. Report only the upper limit of this interval in hours to one decimal place.

Answer #1

Osmar Ltd conducted a study to determine the lifetimes of the
light bulbs produced by their Melbourne plant. Based on studies in
other plants, it could be assumed that the variance of the
lifetimes was 130000 hours squared. Experimental testing of 49
light bulbs yielded an average lifetime of 24 hundred hours.
Construct a 90% confidence interval for the average lifetime of the
bulbs produced in Osmar's Melbourne plant. Report the lower limit
in hours to 1 decimal place.

Osmar Ltd conducted a study to determine the lifetimes of the
light bulbs produced by their Melbourne plant. Based on studies in
other plants, it could be assumed that the variance of the
lifetimes was 100000 hours squared. Experimental testing of 50
light bulbs yielded an average lifetime of 27.7 hundred hours.
Construct a 90% confidence interval for the average lifetime of the
bulbs produced in Osmar's Melbourne plant. Report the lower limit
in hours to 1 decimal place.

Osmar Ltd conducted a study to determine the lifetimes of the
light bulbs produced by their Melbourne plant. Based on studies in
other plants, it could be assumed that the variance of the
lifetimes was 100000 hours squared. Experimental testing of 50
light bulbs yielded an average lifetime of 27.7 hundred hours.
Construct a 90% confidence interval for the average lifetime of the
bulbs produced in Osmar's Melbourne plant. Report the lower limit
in hours to 1 decimal place.

LightsPlus Ltd conducted a study to determine the lifetimes of
the light bulbs produced by their Brisbane plant. Based on studies
in many other plants, it could be assumed that the variance of the
lifetimes was 90000 hours squared. Experimental testing of 51 light
bulbs yielded an average lifetime of 21.9 hundred hours. Construct
a 90% confidence interval for the average lifetime of the bulbs
produced at the LightsPlus Brisbane plant. Report the lower limit
in hours to 1 decimal...

Suppose that lifetimes of light bulbs produced by a certain
company are uniformly distributed between 700 and 1100 hours. What
is the probability for a randomly selected 64 light bulbs that
total lifetime is at least 55600 hours?

Suppose that lifetimes of light bulbs produced by a certain
company are uniformly distributed between 700 and 1100 hours. What
is the probability for a randomly selected 64 light bulbs that
total lifetime is at least 55600 hours? (use 4 digits after
decimal point) [hint: P(ΣX ≥
55600 hours)=?]

A light bulb manufacturer wants to compare the mean lifetimes of
two of its light bulbs, model A and model B. Independent random
samples of the two models were taken. Analysis of 11 bulbs of model
A showed a mean lifetime of 1361hours and a standard deviation of
83 hours. Analysis of 15 bulbs of model B showed a mean lifetime of
1304 hours and a standard deviation of 81hours. Assume that the
populations of lifetimes for each model are...

A package of light bulbs promises an average life of more than
750 hours per bulb. A consumer group did not believe the claim and
tested a sample of 40 bulbs. The average lifetime of these 40 bulbs
was 740 hours with ? = 30hours. The manufacturer responded that its
claim was based on testing hundreds of bulbs.
b.Given the usual sampling assumptions, is there a 95%
probability that 750 lies in the 95% confidence interval of the
manufacturer?
c.If...

FOR NEXT 5 QUESTIONS USE THE FOLLOWING DIRECTION: The average
life of light bulbs produced by SABA Electric Co. is expected to be
normally distributed with the mean service life of 950 hours and
standard deviation of 100 hours. A random sample of 100 bulbs is
tested and it has a mean life of 910 hours.
Can researcher conclude that the mean service life of the bulbs
is less than the expectation? H0 is null hypothesis, and Ha is
alternative...

1) The average life of light bulbs produced by SABA Electric Co.
is expected to be normally distributed with the mean service life
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the expectation at significant level of 0.02? 1) Which method
researcher can use to check...

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