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Does your experimental drug affect cholesterol? You run a study where the 15 subjects in group #1 receive the experimental drug and the 15 in group #2 receive a placebo. A t- test on your data yielded an observed value of 2.01.
a. What is the null hypothesis?
b. How many degrees of freedom are there?
c. Is this situation one tail or two tail? Explain your answer.
d. What is the critical value of t?
e. Assuming an alpha level of .05, do you reject the null? Explain your answer.
explain the parts of a decision tree.what are some benefits of using decision trees?in what ways can decision trees be
The average American male wears a size 10 shoe and spends 4 hours a year tying a tie. The average American female college student owns 3.5 pairs of jeans.
In a large metropolitan area, past records revealed that 30 percent of all the high school graduates go to college. Each student's choice to go to college is independent. From 20 graduates selected at random, what is the probability that exactly 8 wi..
A study of 25 graduates of four-year colleges by the American Banker's Association revealed the mean amount owed by a student in student loans was $14,381.
Explain the double-negative logic of hypothesis testing (eg: a scientist fails to reject the null hypothesis). What is the five-step process for hypothesis testing? Is the order important? Why or why not?
The historical reports from two major networks showed that the mean number of commercials aired during prime time was equal for both networks last year.
In a study of how managers attempt to manage earnings, researchers analyzed a sample of 515 earnings- management attempts from a survey of experienced auditors. The frequency of effects is summarized in the table shown. Research question: At α..
Senate should not worry. He polls one legion of 1,000 men and finds that 340 of them are barbarians. What is the test statistic for this hypothesis test?
If there is a negative dependent variable of -0.55, and independent variables Y1 of +0.75 and Y2 of -3.0, how do I interpret the relationships according to the signs?
a warehouse employs 21 workers on first shift and 18 workers on second shift. eight workers are chosen at random to be
Analyze the residuals of the regression model identified in using formal hypothesis test, check the adequacy of your regression model.
Which of the following would be most helpful in assessing the practical significance of a test of hypotheses about a proportion?
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