Determine x-bar and s for this data set. you may suppose, Ask an Expert

Statistics

Q1) Light-bulb producer advertises that average life for its light bulbs is 900 hours. Random sample of 15 of its light bulbs resulted in following lives in hours.

995	590	510	539	739	917	571	555
916	728	664	693	708	887	849

a) Determine x-bar and s for this data set.

b) At 10% significance level, do data give evidence that mean life for the company's light bulbs varies from advertised mean? You may suppose the values for bulb life are normally distributed. Use traditional method to make your decision.

View complete question

Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M9169653

Have any Question?Write your Review or question?

Related Questions in Statistics and Probability

1 for this problem carry at least four digits after the

1. For this problem, carry at least four digits after the decimal in your calculations. Answers may vary slightly due to rounding. Santa Fe black-on-white is a type of pottery commonly found at archaeological excavations ...

The national safety council reported that 52 of american

The National safety council reported that 52% of American turnpike drivers are men. A sample of 300 cars traveling southbound on the New Jersey Turnpike yesterday revealed that 170 were driven by men. At a 99% level of c ...

Your environmental science professor designs an experiment

Your environmental science professor designs an experiment to see whether students in her class care about recycling. She places a recycling bin and a trash bin at the front of the class and then hands out a piece of pap ...

According to the national health interview survey 47 of us

According to the national health interview survey, 4.7% of U.S adults 50 and older have had a total knee replacement. A random sample of 20 adults 50 and older has been selected. Use the Poisson distribution to approxima ...

Suppose you want to calculate the z-score for your height

Suppose you want to calculate the? z-score for your height. How will the? z-scores compare if you use your height in inches verses? centimeters?

The board of a major credit card company requires that the

The board of a major credit card company requires that the mean wait time for customers when they call customer service is at most 3.00 minutes. To make sure that the mean wait is not exceeding the requirement, an assist ...

The following are amounts of time minutes spent on hygiene

The following are amounts of time (minutes) spent on hygiene and grooming in the morning by survey respondents (based on data from an SCA survey). 15, 16, 18, 25, 26, 30, 32, 41, 45, 55, 63. Does the number 63 appear unu ...

Suppose that you have 5000 and you are contemplating the

Suppose that you have $5000 and you are contemplating the purchase of two investments, IBM and Walgreen's. One year from now, IBM can be sold at $ X per dollar invested, and Walgreen's can be sold for $ Y per dollar inve ...

Sixty-seven percent of adults have looked at their credit

Sixty-seven percent of adults have looked at their credit score in the past six months. If you select 31 customers, what is the probability that at least 20 of them have looked at their score in the past six months?

A travel analyst claims that the mean room rates at a

A travel analyst claims that the mean room rates at a three-star hotel in Chicago is greater than $152. In a random sample of 36 three-star hotel rooms in Chicago, the mean room rate is $165 with a standard deviation of ...

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