The quality-control manager at a light bulb factory needs, Ask an Expert

Statistics

The quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of light bulbs is equal to 375 hours. The population standard deviation is 100 hours. A random sample of 64 light bulbs indicates a sample mean life of 350 hours
a. At the 0.05 level of significance, is there evidence that the mean life is different from 375 hours?
b. Compute the p-value and interpret its meaning.
c. Construct a 95% confidence interval estimate of the population mean life of the light bulbs.
d. Compare the results of (a) and (c). What conclusions do you reach?

View complete question

Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M9116442

Have any Question?Write your Review or question?

Related Questions in Statistics and Probability

According to a study in a previous year 570 of households

According to a study in a previous year, 57.0% of households nationwide used natural gas for heating during a year. Recently, a survey of 2,700 randomly selected households showed that 58.0% used natural gas. Use a 0.05 ...

Aprobability experiment consists of rolling a 6-sided die

A probability experiment consists of rolling a 6-sided die. What is the probability of rolling a number less than 6.

Lt x be a normally distributed random variable with mu

Let X be a normally distributed random variable with μ = 100 and σ = 10. Find the probability that X is between 80 and 105. (Round your answer to the nearest whole number percent and include the percent symbol.)

On a correlation matrix you will usually see two values per

On a correlation matrix, you will usually see two values per comparison. The top value for a correlation measurement will be the Pearson correlation, right under that you will see a p-value. I understand when you have a ...

Bob is interested in studying whether the average household

Bob is interested in studying whether the average household income in city A is lower than the national benchmark, μ 0 = $51,500. He collects income information from a random sample of 100 households, conducts a one-sam ...

The manufacturer of a new fertilizer wants to show that the

The manufacturer of a new fertilizer wants to show that the new chemical increases bean yields. The average acre currently yields 146.8 bushels of beans. State the null and alternative hypotheses that the manufacturer wo ...

After 5 years at her company katy just got promoted and

After 5 years at her company, Katy just got promoted and decided to buy a new house worth $230,000. She can pay 10% up front for the down payment, then apply for a 30-year mortgage, 6.6% annual rate for the remaining bal ...

One hundred twenty-five marine recruits participated in a

One hundred twenty-five marine recruits participated in a study to assess the benefits of a strength training program. Each recruit was given a push-up test at the beginning and end of the program. The change in number o ...

A company that sells annuities must base the annual payout

A company that sells annuities must base the annual payout on the probability distribution of the 2) length of life of the participants in the plan. Suppose the probability distribution of the lifetimes of the participan ...

Rework problem 3 from section 43 of your text involving the

Rework problem 3 from section 4.3 of your text, involving the expected value of a given probability density function. Use the density function shown below instead of the one in your text. Value of X: ; Probability: 1 1/2 ...

4,153,160 Questions Asked
13,132 Experts
2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Recent Questions

Ask Statistics and Probability Expert