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You plan to conduct a survey to find what proportion of the workforce has two or more jobs. You decide on the 95% confidence level and that the estimated proportion must be within 2% of the population proportion. A pilot survey revealed that 5 of the 50 sampled hold two or more jobs. How many in the workforce should be interviewed to meet your requirements?
A researcher is comparing two antihypertensive drugs A and B with regards to reduction of patient's systolic blood pressure (SBP). Baseline SBP is measured for two groups of patients.
Find a 95% confidence interval for the long-run proportion of new product placements?
A recent study by a large retailer designed to determine whether there was a relationship between the importance a store manager placed on advertising and the size of the store revealed the following sample information:
Explain the difference between the null hypothesis and the alternate hypothesis. How is the null hypothesis chosen (why is it null)? What is the importance of rejecting the null hypothesis, can we make a geneeral staement about the population base..
A psychology professor is interested in whether implementing weekly quizzes improves student learning. She decides to use the weekly quizzes in one section of her introductory psychology class and not to use them in another section of the same cou..
One-fourth of the residents of the Burning Ridge Estates leave their garage doors open when they are away from home. The local chief of police estimates that 5 percent of the garages with open doors will have something stolen
What is the probability of selecting a store at random and finding it has both a pharmacy and a floral shop?
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.
A psychologist has to develop a new test of spatial perception, and she wants to estimate the mean score achieved by male pilots. How many people must she test if she wants the sample mean to be in error by no more than 2.0 points, with 95% confid..
The country clerk wants to estimate the protection of retired voters who will need special election facilities. suppose a sample of 400 retired voters was taken. If 150 special election facilities, calculate an 80% confidence for the population pr..
The remaining 5 were not given the overview. Here are the scores for students in each group:
A device has a sensor connected to an alarming system. The sensor triggers with probability 0.95 if dangerous conditions exist in a given day and with probability 0.005 if conditions are normal during the day. Days with dangerous conditions occur ..
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