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The MacBurger restaurant chain claims that the mean waiting time of customers for service is normally distributed, with a mean of three minutes and a standard deviation of one minute. The quality assurance department found in a sample of 50 customers at the Warren Road MacBurger that the mean waiting time was 2.75 minutes. At the 0.05 significance level, can we conclude that the mean waiting time is less than three minutes?
The manufacturer of a coffee dispensing machine claims the ounces per cup is normally distributed with population mean equal to 8 ounces and standard deviation equal to 0.9 ounces. If 50 cups of coffee were measured, what is the possibility that- ..
A study of cardiovascular risk factors compared heavy smokers, light smokers, and nonsmokers. Both men and women were included in the study so that the two factors are smoking level and gender.
Test the whether the attitude toward keeping weight down associated with smoking status.
The standard deviation of the population of completion times is minutes, what is the minimum sample size needed for the managers to be confident that their estimate is within minutes of?
What is an appropriate sample space for this experiment?
Is there a significant difference in sales dollars of hats between the west side and east side stores at the 5 percent level of significance? (a) State the hypotheses. (b) State the decision rule and sketch it. (c) Find the test statistic and stat..
As part of the National Health and Nutrition Examination Survey, the Department of Health and Human Services obtained self-reported heights and measured heights for males aged 12-16. All measurement is in inches. Listed below are sample results.
The unlikelihood of everyone who plays the lottery choosing a correct 6 would be very large indeed. Is this unethical advertising? Is it misleading? is the lottery in general, unethical? Why or why not?
The value of "Z" chosen for constructing (calculating) the confidence interval estimate is determined by
A chemical process converts lead to gold. However, the production varies due to the powers of the alchemist. It is known that the process is normally distributed, with a standard deviation of 2.5 g. How many samples must be taken to be 90% certain..
How do we decide if the homogeneity of variance assumption is significantly violated?
Scores for men on the verbal portion of the SAT test are normally distributed with a mean 509 and a standard deviation of 112. Randomly selected men are given the Columbia
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