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1) Describe how power of hypothesis test is influenced by each of following. Suppose that all other factors are held constant.
a) Increasing the alpha from 0.01 to 0.05.
b) Changing from one-tailed test to two-tailed test.
2) Researcher is estimating influence of treatment using sample selected from normally distributed population with mean of m = 80 and standard deviation of s = 20. Researcher expected 12 point treatment effect and plans to use two tailed hypothesis test with = 0.05.
Calculate power of test if researcher uses a sample of n = 16 individuals.
What is the value of the population mean? What is the best estimate of this value?
Construct a 95% confidence interval for the average amount its credit card customers spent on their first visit to the chain's new store in the mall assuming that the amount spent follows a normal distribution.
Such things as historical documents, newspaper reports, TV and radio broadcasts, when used in research, represents
Public transportation and the automobile are two methods an employee can use to get to work each day. Samples of times recorded for each method are shown. Times are in minutes.
How large sample size must be taken to be 95% confident.
The following table shows the hardness (in Brinell hardness numbers) and the tensile strength (in thousands of pounds per square inch) of ten specimens of a certain alloy.
Determine relative frequency of X=4? Generate the cumulative frequencies.
Assume that a simple random sample has been selected from a normally distributed population. Find the test statistic, P-value, critical value(s), and state the final conclusion.
Advertisers need to know which age groups are likely to see their ads. Purchasers of 120 copies of Cosmopolitan are shown by age group Perform the chi-square test for a uniform distribution at α = .01
Set-up/solve the problem graphically. (How many ceiling fans and how many floor fans should be made?)
The 95% confidence interval for the mean of the sampling distribution of the mean is about:
Using the 0.01 significance level, can we conclude that there is a positive correlation between the variables?
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