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A manufacturer claims that the thickness of the steel plates it produces is 61 mils (thousandth of an inch). Car manufacturer's quality control officer regularly checks the claim. From a recent shipment he took a random sample of 50 plates: the sample mean and variance are 61.3 and 1.22, respectively. In order to verify that the manufacturer's claim is accurate, what should his null hypothesis be and should it be accepted at 10% significance level?
Which test is used: Two-Tail, Upper-Tail, Lower-Tail?
Hypotheses: Ho: Ha:
Conclusion: Reject or fail to reject null hypothesis?
A company that manufactures computer chips wants to use a multiple regression model to study the effect that 4 different variables have on y, the total daily production cost (in thousands of dollars).
You have been asked to talk to a group of managers who are skeptical about the use of descriptive statistics as an aid to decision-making. What examples might you use to illustrate how these statistics can enhance decision-making?
Final model for the clothing retailer problem. The residual plots below show the residuals for the final model in the clothing retailer problem plotted against Purchase12 and Recency. Do the plots suggest any potential problems with the conditions..
What is the conditional probability that exactly four heads appear when a fair coin is flipped five times, given that the first flip came up heads?
after practicing the coach still has to decide on the two alternate captains for the bronco hockey team. with 27
A supermarket chain is considering two sources A and B for the purchase of 50-pound bags of onions. The following table gives the results of a study.
A partial computer output from a regression analysis as follows. The regression equation is:
When two variables are correlated (such as strength and running speed), it also means that they are associated with one another. But if they are associated.
Calculate the lower endpoint of a 90% confidence interval for the population mean (number of minutes using the cell phone.
What is a 90 % confidence interval for the population proportion of women who change their nail polish once a week.
Test the hypothesis that the median percentage of family income spent for food and groceries is 35 against the alternative that it is less than 35. Use α = 0.05.
Max likes to keep track of birthdays of people he meets. He has 170 birthdays listed on his birthday calendar. One cold January night, he comes up with.
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