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Quarterly customer surveys are taken at a medical center. Each individual department has scores and is comparted to the medical center average. Department of Physical Therapy had scores of 9.14, 9.19 and 7.75 for quarters 1-3 respectively. The medical center had scores of 9.01, 9.00 and 9.05 for quarters 1-3 respectively.
The mean average customer service score for PT for quarters 1-3, 2007 is 8.69. The mean average for the medical center during the same time frame is 9.02.
What is the probability that quarter 4 PT scores will be less than a 10% standard deviation less than the medical center average warranting an action plan? Show a 95% realiabilty.
Two tailed test.
The null hypothesis is that The dept. of PT will score equal to or greater than the medical center average in quarter 4. The alternative hypothsis is that the dept. of PT will score less than the medical center average.
The number of viewers of American Idol has a mean of 29 million with a standard deviation of 5 million. Assume this distribution follows a normal distribution.
A Gallup Poll (June 9 to 12, 2008) interviewed a random sample of 822 adults (18 years or older). The people in the sample were asked about their level of confidence in a variety of institutions in the United States. Here are the results for small..
At the 5 percent level of significance, does this sample prove a violation of the guideline that the average patient should pay no more than $250 out-of-pocket? State your hypotheses and decision rule.
A researcher desires to estimate the difference in means of two populations. To accomplish this, she takes a random sample of 81 items from the first population.
Perform the sensitivity analysis for the COM-TECH case. Assume you are interested in following two probabilities: probability of receiving grant, and probability of high cellular R&D costs.
You're the production manager for operation that produces circuit boards. Each board is tested at the end of manufacturing process. Rejected boards are discarded and have no future value.
Fitting of simple linear regression equation - A researcher wishes to determine whether a person's age is related to the number of hours he or she jogs per week.
A hospital human resources manager finds that the local average starting salary for nurses is $24,000. She randomly samples 10 nurse's salaries at the hospital and calculates a mean of $23,450 and a standard deviation of $400.
Which of the following is true regarding ANOVA? a) It is used to test for a difference in medians among three or more populations
Provide a discussion that supports the assumption that the variance of savings increases with family income.
Based on the answers to a through d, decide whether or not to reject the null hypothesis at the given significance level. Explain your conclusion in the context of the problem.
We desire to test at 0.05 level of significance whether modification increases the life of battery. What is our decision rule? Reject null hypothesis if calculated t is less than 1.96.
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