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The birthweights for babies born at 40 weeks follow a normal distribution with mean 3.46kg, and a standard deviation 0.58kg.
(a) What is the expected total weight of 100 randomly chosen babies?(b) What is the standard deviation of the total weight of 100 randomly chosen babies?(c) Repeat parts (2a) and (2b) for the average weight of 100 randomly chosen babies.(d) What is the expected total weight of 10,000 randomly chosen babies?(e) What is the standard deviation of the total weight of 10,000 randomly chosen babies?(f) Repeat parts (2d) and (2e) for the average weight of 10,000 randomly chosen babies.(g) Using your answers to the earlier parts of this question, explain how the sample size affects the mean and SD of the sum of a collection of random variables. Limit your answer to 2-3 sentences.(h) Using your answers to the earlier parts of this question, explain how the sample size aects the mean and SD of the average of a collection of random variables. Limit your answer to 2-3 sentences.
Briefly explain how the standard deviation influences outcome of hypothesis test. How does σ influence measures of effect size?
Lauren Moore has sold her business for $500,000 and wants to invest in condominium units ( which she intends to rent) and land ( which she will lease to a farmer).
The average patient should pay no more than $250 out-of-pocket? State your hypotheses and decision rule. (b) Is this a close decision?
The upper limit of a 95% confidence interval for the population mean would equal:
A manufacturer wants to increase the shelf life of a line of cake mixes. past records indicate that the average shelf life of the mix is 216 days. after a revised mix has been developed, a sample of nine boxes of cake mix gave these shelf lives (i..
Use the sample results with a 0.05 significance level to test the claim that pulse rates of men have a standard deviation greater than 10 beats per minute.
A study reported in "Inside Higher Education News" (May, 2006) found that financial incentives can improve low-income college students' grades and retention.
I have a problem that wants to know the sample size of Illinois republican voters, they want to know the sample size with 95% confidence and 3% margin of error, not sure how to get started.
Imagine you are the CEO of a local bank whose credit card holders engage in 1 billion credit card transactions per year; that the likelihood of a fraudulent transaction is 2%
Airlines monitor the causes of flights arriving late. 75% of flights are late because of weather, 35% of flights are late because of ground operations. 10% of flights are late because of weather and ground operations.
At the .05 level, you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period. Is this a 1 or 2 tail test?
In the sample of 80 students, 9 were found to be overweight. At a= 0.01, is there adequate evidence to reject claim using critical values?
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