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Over the past year, the vice president for human resources at a large medical center has run a series of three-month workshops aimed at increasing worker motivation and performance. To check the effectiveness of the workshops, she selected a random sample of 35 employees from the personnel files. She collected the employee performance ratings recorded before and after workshop attendance and stored the paired ratings for all 35 in Perform.
Calculate the 90% confidence interval about μ if sample size, n, is 55. How does increasing sample size affect margin of error, E?
What is the value of the sample test statistic? (Test the difference p1 - p2. Do not use rounded values. Round your final answer to two decimal places.)
A researcher is comparing two antihypertensive drugs A and B with regards to reduction of patient's systolic blood pressure (SBP). Baseline SBP is measured for two groups of patients.
In a survey conducted to see how long Americans keep their cars, 2000 automobile owners were asked how long they plan to keep their present cars. The results of the survey follow. Find out the probability distribution associated with these data.
Is there sufficient evidence to support the claim that site has an effect on the amount of pesticide?
The following data provided by a coffee company are the roast time in minutes for five batches of coffee (x) and the resulting shrinkage in percent of the coffee weight(y).
Find out the variance for percentage of tickets? Determine the probability that your sample will have the average between 70 and 75?
At the .01 significance level, can she conclude that there is a difference between how well the different tutorials work for the students?
The trail was repeated 54 times with 22 correct identifications and 32 wrong identification.
Describe the meaning of alternatives, criteria and states of nature. How are they utilized in decision analysis?
To test whether the significant difference between two proportion test using large sample test.
Construct the 90 percent confidence interval for the proportion of checking account customers who have a Visa card with the bank. (Round your answers to 3 decimal places.)
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