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A researcher is evaluating the influence of a treatment using a sample selected from a normally distributed population with a mean of u = 80 and a standard deviation of o= 20. The researcher expects a 12 point treatment effect and plans to use a two-tailed hypothesis test with a = .05.
a. Compute the power of the test if the researcher uses a sample of n = 16 individuals
b. Compute the power of the test if the researcher uses a sample of n = 25 individuals.
Problem based on decision tree - Evaluate the strategy that maximizes the manufacturer's expected net earnings.
To compare the effectiveness of two treatments 1 and 2 for a particular disease. Patients were separated in 2 treatment groups. A patient in group 1 received treatment 1 and patients in group 2 received treatment 2.
No, there is not enough information to refuse hypothesis that proportion of male students who live on campus and proportion of female students who live on campus are same as the test value -1.65 is inside acceptance region (-1.96,1.96).
The average speed of greyhound dogs is about 18.8 meters per second. A particular greyhound breeder claims that her dogs are faster than the average greyhound. In a sample of 45 dogs, they ran, on average, 19.2 meters per second with a standard de..
Suppose that you are interested in determining the relation between the students average SAT scores [x] and their freshman GPA [y].
There are 6 children in a family. The number of children defines a population. The number of simple random samples of size 2 that are possible equals:
Examine the plot of the regression residuals against t. Is there a tendency for the residuals to have long positive and negative runs? To what do you attribute this phenomenon?
A scatter plot and regression line can be used for all of the following EXCEPT
Identify the level of measurement (nominal, ordinal, interval, ratio) for the number of shares held by stockholders.
Determine the percent of the days is the price between $38.00 and $40.00?
Compute a 90 percent confidence interval for the difference among the two population proportions. The CEO of the company would like to find out if Canadians.
How many degrees of freedom should the researcher use in her t-test critical value assuming that the variances are equal?
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