A researcher is evaluating the influence of a treatment using a sample selected from a normally distributed population with a mean of μ = 40 and a standard deviation of σ = 12. The researcher expects a 6-point treatment effect and plans to use a two-tailed hypothesis test with α = .05.   Compute the power of the test if the researcher uses a sample of n = 9 individuals.   Compute the power of the test if the researcher uses a sample of n = 16 individuals

A sample of 20 third-grade students had a average of 54 on a math proficiency test, with a sample standard deviation of 11. Is there enough evidence to conclude that the third-grade sample mean differs significantly from the third-grade population mean of 67? Assume a 0.02 significance level.  Use the Critical Value Method of Testing (this means NO P-Values!).   will need to have -1.  The null hypothesis, Ho 2.  The alternative hypothesis, H1 3.  The test statistic4.  The type of test(left, right, two-tailed) and the p-value 5.  The decision to accept Ho or reject Ho

Data provided by the National Association of College Employers indicated that the average starting salary for graduates with a Bachelors Degree in Accounting was $37,000 in 2008. In June 2010 a sample of 48 graduating accounting majors provided a sample average starting salary of $38,100, with a sample standard deviation of $5200. Conduct a hypothesis test to determine if it can be assumed that accounting graduates in 2010 had higher average salaries than graduates in 2008, using α = .05.

Breyers is a major producer of ice cream and would like to test the hypothesis that the average American consumes more than 17 ounces of ice cream per month. A random sample of 15 Americans was found to consume an average of 18.2 ounces of ice cream last month. The standard deviation for this sample was 3.9 ounces. Breyers would like to set α = 0.10. The conclusion for this hypothesis test would be that because the test statistic is A)  more than the critical value, we can conclude that the average amount of ice cream consumed per month is not greater than 17 ounces. B)  more than the critical value, we can conclude that the average amount of ice cream consumed per month is greater than 17 ounces. C)  less than the critical value, we can conclude that the average amount of ice cream consumed per month is greater than 17 ounces. D)  less than the critical value, we cannot conclude that the average amount of ice cream consumed per month is greater than 17…