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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.
At the .05 significance level, can we conclude that the guideline is still reasonable?
If it is determined that there is no difference between the population mean being represented by the sample and the mean of the population at large, then:
Determine the sample size needed in order to be 99% confident that the sample proportion of the current customer accounts is within .03 of the true proportion of all current accounts for this company.
At the .01 significance level can we conclude the mean age is more than 8.4 years for the cars of university students? Compute the value of the test statistic.
The dimension is supposed to be 224 mm and the variability of the manufacturing process is unknown. Is there evidence that the mean dimension is not 224 mm?
Find a 99% confidence interval estimate of the proportion of people who say that they voted.
For sample of size 100, what is the mean and standard deviation of the sample mean.
write down the hypothesis the test used the p-value and the interpretation then hand calculates a 95% CL for the odds ratio estimate on this last test.
If only one bolt is chosen, determine the probability that it will be found defective for only 1 reason (that is. it is either too large or has poor workmanship, but not both.)
Suppose that past data are not available for developing a planning value for p; therefore, you will use p = 0.050 for the planning average.
What is the probability that a particular driver had exactly two speeding violations?
Use the permutations rule to determine the total number of different ways the winners can be drawn.
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