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Twenty-five factory workers were asked how many vacation days they take a year. The average of the sample was 22.85 days, and the standard deviation was 5.80 days. In the past HR uses an average of 25 vacation days per worker in order to make available man-hour and payroll predictions. Is there evidence to show that the number of vacation days decreased over the past year? Use alpha = .05
State the hypothesis, the test statistic, the conclusion, (what you are accepting or rejecting) and make sure you answer the question.
Determine the z values for 29 and 34 hours. What percent of the garages take between 32 hours and 34 hours to erect?
A sample of 81 business managers on the West Coast had an average breakfast cost of $7.65. 13. At a = 0.05, what is the test value?
In the real world, given null hypothesis is false; but the collected data lead to the null hypothesis being accepted. That is, the data lead to a failure to reject null hypothesis.
What is the stock's value at it's highest on 15 days of the year? (Assume that there are 240 trading days in a year).
One approach would be to contact every psychology graduate student you know and ask them to fill out a questionnaire about it.
A faculty group wants to determine whether job rating (x) is a useful linear predictor of raise (y). Consequently, the group considered the linear regression model:
Z score on comparison distribution for sample score and your conclusion. Suppose that all population are normally distributed.
If a garage is robbed, what is the probability the doors were left open?
According to a hospital administrator, historical records over the past 10 years have shown that 20 percent of major surgery patients are dissatisfied with after-surgery care in the hospital. A scientific poll based on 400 hospital patients has ju..
A frequency polygon: does not depend on one variable. True-False
A loan application is received this morning. What is the probability that:
A radio station wants to know if residents in their area are in favor of a proposed tax increase. They invite listeners to call in to respond to the poll. 645 of the 800 who responded were against the tax.
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