Calculate ninety five percent onfidence intervals for mean

Assignment Help Basic Statistics
Reference no: EM13145100

The mean of the sample of 65 customer satisfaction ratings in Table 1.7 is x = 42.95. If we let u(mean) denote the mean of all possible customer satisfaction ratings for the XYZ Box video game system, and assume that standard deviation 2.64:

A.) Calculate 95 percent and 99 percent confidence intervals for u(mean).

B.) Using the 95 percent confidence interval, can we be 95 percent confident that u(mean) is at least 42 (recall that a very satisfied customer gives a rating of at least 42)? Explain.

C.) Using the 99 percent confidence interval, can we be 99 percent confident that u(mean) is at least 42? Explain.

D.) Based on your answers to parts b and c, how convinced are you that the mean satisfaction rating is at least 42?

Reference no: EM13145100

Information about null and alternative hypotheses

The average age for all medicare patients in the USA is 75. A sample from a clinic shows that the average age of the clnic medicare patients is 78.

Pearson or product-moment correlation

Could you explain the Pearson or product-moment correlation? If we were to use a partial correlation, would you want to look at the relationship between two variables while

Calculate the expected value and standard deviation

You are examining a brick manufacturing facility. The process has historically produced 5% nonconforming bricks. Calculate the expected value and standard deviation of the n

How much time should be allowed to complete tasks

How much time should be allowed if we wish to ensure that at least 9 out of 10 students (on average) can complete it? (round to the nearest minute).

Find two telecommunication system equally liked

Independent random samples of 12 users of the other system rate their system on the same scale. Based on these data, are the two telecommunication system equally liked? Explai

Determine the forecast for last quarter

Forecast quarterly demand where x = 0 in second quarter of last year. Quarterly seasonal factors are Q1=1.5, Q2=0.8, Q3=1.1, Q4=0.6. Determine the forecast for last quarter?

Find sample size necessary to estimate a population mean

Determine the sample size necessary to estimate a population mean to within 1 with a 90% confidence given that the population standard deviation is 10.

What is probability that exactly four sets detect missile

A missile protection system consists of n radar sets operating independently, each with a probability of .9 of detecting a missile entering a zone that is covered by all of

Reviews

Write a Review

 
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd