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A researcher expects the population proportion of the Cubs Fans in Chicago to be 80%. Error of less than 5% confident of an estimate to be made from a mail survey. What is the sample size required?
Given the following situation, how would you use Megastat to test whether the population defective rate is greater than 5%? Please outline the process for the test and, if necessary, including the output from Megastat to explain your approach.
If there are 81 fraternity members, how much should they buy so that using the normal approximation they are 93.32% sure they will not run out?
How would you interpret the findings of a correlation study that reported a linear correlation coefficient of -1.34? a) strong linear correlation b) weak linear correlation c) impossible, d) calculation error no linear correlation
Such tv are randomly selected and checked to determine what is being watch. Would it be unusual to find that 954 of the 2500 tvs are tuned to eyewitness news?
Is a sample of 25 papers large enough to provide a good estimate of the mean score of all 42,000 students on this exam problem? Justify your answer.
Provide a plausible research question in the field of education that implies a bivariate correlation or regression. Identify your research question, your research (alternative) hypothesis, and your null hypothesis.
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
A researcher used stepwise regression to create regression models to predict Birth-Rate (births per1000) using five predictors:
Determine the mean annual amount spent on household consumption per family with a sample of 100 families, an average amount of $8,000 spent, and if the population standard deviation is $500,
Construct a 99% confidence interval for the population mean tread wear for this type of tire.
The price of XYZ Corporation stock is normally distributed all through the year with mean of $42.00 per share and a standard deviation of $2.25 per share. Suppose that the stock is traded 240 days out of the year.
State the research question and statistical null and alternative hypotheses; and Explain why this test is appropriate and why the correlation, t-test, regression, or ANOVA is not appropriate.
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