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Assuming a normal distribution for the average, what is the chance that the total time is more than 16 minutes? B) Is it reasonable to assume a normal distribution here? Why or why not? C) Now give an integral equation (that you can approximate numerically) that gives the exact chance the total time is more than 16 minutes. 5) 6.14 Comment on the shape, what distribution is a reasonable t? 6) 6.30 Comment on the shape, same as the stef and leaf?
An investment project is expected to earn $100,000 on average with a standard deviation of $50,000. Assume earnings from this investment project is a normal distribution. Of the next 15 people that invest in this project, what is the probability t..
Make a purchase using the internet. Test the claim that the proportion of consumers ages 35-44 who plan to make purchases using the internet has increased at α = 0.01.
Use the normal approximation to estimate the probability of at least one disaster in 25 missions.
Suppose that the risk of allergies for the children of nonsmokers is 0.15. What is the risk of allergies for the children of smokers?
Compare your best difference to the result from an ordinary two-sample t-test between these groups. Comment the difference.
A researcher selected a sample of 50 residents from each of three different cities to determine if they were willing to participate in a medical experiment. At a = .05, test the claim that the proportions who will participate are equal.
Construct a 90 percent confidence interval for the true mean weight. What sample size would be necessary to estimate the true weight with an error of +/-} 0.03 grams with 90 percent confidence?
Use the given confidence level and sample data to find a confidence interval for estimating the population mean
Set up a hypothesis test. Is Charmers' truthful? Describe by working through hypothesis test.
What is the probability that the average of the scores of the two students from university A will be greater than average of the scores of the three students from University B?
Show all the steps of your hypothesis test including a) the claim being tested , b) the null and alternative hypothesis, c) the test statistic, d) the p value, e) initial conclusion, and f) a final conclusion about the original claim.
Use formula z=(mean of values in sample - mu subscript mean of values in sample) divided by (lower case sigma divided by sqrt number of values in sample)
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