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A poll found that in a random sample of 1000 American adults, 730 indicated that they oppose the reinstatement of a military draft. Is there convincing evidence that the proportion of American adults who oppose reinstatement of the draft is greater than 0.7? Use a significance level of 0.05. (For z give the answer to two decimal places. For P give the answer to four decimal places.)
As a part of the feasibility study, they wish to estimate the mean weekly child-care cost of their employees. A sample of 10 employees who use child care reveals the following amounts spent last week.
Develop a spreadsheet model to determine the optimal number of magazines to order each day. Use 500 replications and round the demand values generated by the normal random number generator (RNG) to the closest integer value.
We wish to determine whether the homicide rate is different in different parts of the country and, if it is different, what is the pattern. We have data on 36 states - 9 each in the four regions Northeast, Midwest, South and West.
You are working on an analysis of your company's current cost structure reviewing the various fixed and variable costs within your firm. Your objective is to maximize your firms profit.
A psychologist is examining the influence of an older sibling in the development of social skills. A sample of 24 three year old children is obtained.
Create a scatter plot for the data. Determine the correlation coefficient for the data.
Suppose that a model for the joint distribution of these rvs is a bivariate normal distribution.
WNAE, an AM station totally dedicated to deliver news, found that while the Distribution of listeners tune in the station follows the normal Distribution.
Suppose the manufacturers claim is right, determine the probability the mean of sample is 47,840 miles or less?
Psychologists once measured 77 variables on a sample of schizophrenic people and a sample of people who were not schizophrenic. They compared the two samples using 77 separate significance tests.
Determine point estimate of population mean? By using 90% confidence, determine the margin of error?
Perform an appropriate hypothesis test, showing the necessary calculations and/or explaining the process used to obtain the results any group over 30 needs z test.
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