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A high school counselor wishes to see if the average number of dropout in his school is 18.He reviews the last 17 years and finds that the number of dropouts each year is as shown. Test her claim at the .01 alpha level.
12 18 24 16 21 20 18 19 19 22 25 16 18 19 19 20 23
Test the teachers hypothesis that there is a significant difference between the pre and post tests.
Test the hypothesis that there is significant difference on the post test scores between sections A and B.
The sample data are summarized by the statistics n = 27, x = 4.6 years, s- 1.9 years.
In a surgey of 280 adults over 50.80%; said they were taking vitamin supplements. Find the margin of error for this survey if we want a 99% confidence in our estimate of the percent of adults over 50 who take vitamin supplements.
If we wanted to shorten the interval of the estimation of the true mean of Saturday sales to a width of $600 in total, what should the size of our sample be to achieve it?
Briefly explain how the standard deviation influences outcome of hypothesis test. How does σ influence measures of effect size?
To forcast the sample size within 0.02 with 90 percent confidence. The CEO of the organization needs to forcast the proportion of Canadians who own their house.
If 25 men aged 18-24 are arbitrarily chosen, determine probability that their mean serum cholesterol level is between 165 and 200.
Determine critical value if alpha = 0.05? If p-value for this test is 0.025, this p-value means?
Which of the following terms describes the overall long-term tendency of a time series?
Describe appropriate treatment means μ1, μ2 and μ3. After that Test for statistically significant differences between these treatment means. Set α = 0.05.
Consider a random sample of six families who are asked if their children have an influence on their vacation destination.
At the .01 significance level, is there a difference in the mean number of times men and Women order take-out dinners in a month? What is the p -value?
Search the library for a scholarly journal article of a study that presents the results using correlation analysis. Summarize the article, explain how the correlation was used, and the value of correlation analysis.
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