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
When using the weighted moving average forcasting method, the sum of all the weights used must add to what number?
Find the 98% confident interval for the difference between the proportions of Minnesota and Wisconsin residents with home internet access. Give a verbal interpretation of the interval.
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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