Sample unequal variance t-test
In an experiment to study the effect of a particular drug on the number of errors in the maze-learning behavior of rats, the following MINTAB results were obtained for a 2 sample unequal variance t-test.
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The sum of the ranks for the day students was determined to be 184.5. Compute the test statistic Z. Use a = 0.05 and test to determine if there is a significant difference in the populations of the scores of the two groups.
A market research survey is available for no cost. Using a decision tree analysis, it is found that the expected value with the survey is $65,000. The expected value with no survey is $62,000 and the EVPI is $4,000. What is the efficiency rating?
A study was conducted to determine whether persons in suburban district II have a lower mean income than those in district I. Random samples were taken in each district with the following results (in $1000s). Determine whether the mean income in D
A market research survey is available for no cost. Using a decision tree analysis, it is found that the expected value with the survey is $65,000. The expected value with no survey is $62,000 and the EVPI is $4,000. What is the expected value of t
The FDA tests the tobaccos in two different types of cigars for nicotine content (in mg) and obtained following results. Construct the 95% confidence interval for the difference between mean nicotine content. Give an interpretation of the interval
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In a particular occupation, a random sample of 210 men found that 65 smoked. In a random sample of 240 women, 87 smoke. Is there enough evidence to conclude males and females in this occupation have different smoking habits? Use a=0.02. 1. Identif
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