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A sample of n=25 individuals is randomly selected from a population with a mean of u=65, and a treatment is administered to the individuals in the sample. After treatment, the sample mean is found to be M=70.
a. If the sample standard deviation is s=10, are the data sufficient to conclude that the treatment has a significant effect using a two-tailed test with a critical value of .05?
b. If the sample standard deviation is s=20, are the data sufficient to conclude that the treatment has a significant effect using a two-tailed test with a critical value or .05?
Employees of a local university have been classified according to gender and job type.
Construct the 95% confidence interval estimate of the mean number of migraine attacks for those treated with acupuncture.
Using what you know about t-scores, identify which of the variables have a significant influence on the LISTPRICE. At a level of 1% which variables are significant?
Using the following data, test the question that an equal number of Democrats, Republicans, and Independents voted during the election. Test the hypothesis at the .05 level of significance.
Exam is given to 20 randomly chosen students and their average length of t time needed to finish exam was 54 minutes with standard deviation of 5.99 minutes. Test instructor's claim at the 0.05 level of significance.
Construct three scatter plots for: (1) percentage alcohol versus calories, (2) percentage alcohol verses carbobydrates, and (3) calories versus carbohydrates
Satellite Office Systems has vacancies for two executives that it will fill from among four women and six men. What is the probability that exactly one woman is selected?
Using a one-sided hypothesis test with a 90% confidence level, which of the following statements do these data support?
If you were going to use multiple regression to develop an appraisal model, what other quantitative variables might be included in the model?
Use your calculator to find the mean and standard deviation for the 9 observations that remain when you leave out the outlier. How does the outlier affect the values of x and s? Is s a resistant measure of spread?
Also find information about blood donations and the percentage of each type donated. How do the charts compare? Why is the collection of type O blood so important?
The camera department of a large department store sells three different brands of cameras: Proxima, Yakima, and Tetron. Approximately 60% of the cameras sold are Yakimas with Tetrons accounting for 30% of sales and Proxima the remaining 10%.
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