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A researcher studying stress is interested in the blood pressure measurements of chief executive officers (CEOs) of major corporations. He believes that the mean systolic blood pressure,u , of CEOs of major corporations is more than134 mm Hg, which is the value reported in a possibly outdated journal article. He plans to perform a statistical test. He measures the systolic blood pressures of a random sample of CEOs of major corporations and finds the mean of the sample to be 140 mm Hg and the standard deviation of the sample to be 20 mm Hg.
What are the null and alternative hypothesis for this?
What is a type II error in context of this test?
Suppose that the researcher deceides not to reject the null hypothesis what sort of error might he be making?
Give an example representing a discrete probability distribution and another example representing a continuous probability distribution. Explain why your choices are discrete and continuous.
Assume that increasing and decreasing allergic reactions are equally likely if the training has no effect. Use alpha = .05
A TV spot in the Channel 22 early news costs $1500. The average quarter hour Adult 25-54 audience is 15,000. What is the CPM?
Four brands of lightbulbs are being considered for use in the final assembly area of the Saturn plant in Spring Hill, Tennessee. The director of purchasing asked for samples of 100 from each manufacturer.
You are the principal of a large urban high school and wish to do a parent survey to determine how parents feel about same-sex classes.
Two new york designs are under consideration for possible adoption in an assembly plant. A time study is conducted with 10 workers using design 1, and 12 workers using design 2. The means and standard deviation of their assembly times in minutes a..
For which of the following situations is it appropriate to use a scatter diagram or scatter plot?
I have fit a line to data representing cholesterol readings for 28 individuals starting a cholesterol reducing drug. The computer provides the following output, The degrees of freedom for the t test for the slope are
Determine the point estimate and 95% confidence interval for the mean family dental expenses of all employees of the company.
Find the value of sample covariance in linear regression model
A mathematical placement test is given to all entering freshmen at a small college. A student who receives grades below 35 is denied admission to the regular mathematics course and placed in a remedial class.
You calculate the difference in income as (after incentive plan - before incentive plan). You want to test whether income after the incentive plan is different from income before the incentive plan. What are the hypotheses for this test?
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