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There are three hospitals in the Tulsa, Oklahoma, area. The following data show the number of outpatient surgeries performed at each hospital last week. At the .05 significance level, can we conclude there is a difference in the mean number of surgeries performed by hospital or by day of the week?
Day Number of Surgeries Performed
St. Luke's St. Vincent Mercy
Monday 14 18 24
Tuesday 20 24 14
Wed 16 22 14
Thursday 18 20 22
Friday 20 28 24
Can an explanation be included?
First part of this theorem allows a problem solver to compute probabilities about sample means regardless of whether a population is normally distributed.
A researcher selected a sample of 50 residents from each of three different cities to determine if they were willing to participate in a medical experiment. At a = .05, test the claim that the proportions who will participate are equal.
Point out your final decision concerning hypothesis test and compute p-value for test.
The Wilcoxon signed rank statistic, The mean for the Wilcoxon signed rank test and The P-value for the Wilcoxon signed rank test
Calculated test statistic, decision about the null hypothesis interpretation of results, and a list of references consulted.
The following data represents 15 quarters of manufacturing capacity utilization (in percentages) Evaluate three and four quarter moving average for this time series. Which moving average provides the better forecast for the fourth quarter of 2003?
Use a calculator or appropriate computer software to verify that, for the preceding data, xbar = 5.1.
Based on a study of heights of men and women who do gymnastics, a researcher concludes that the exercise from playing gymnastics causes people to become shorter. Do you agree with this conclusion?
The accounting department at Weston Materials, Inc., national manufacturer of unattached garages, reports that it takes two construction workers mean of 32 hours and standard deviation of 2 hours to erect the Red Barn model.
Serum ferritin is used in diagnosing iron deficiency. In a study conducted recently researchers discovered that in a sample of 28 elderly men the sample standard deviation of serum ferritin was 52.6 mg/L. For 26 younger men the sample standard dev..
Faced with rising Fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead. Exceptions are allowed, but they want the average to be 10 or below.
How many of these new cardholders would you expect to default? What is the standard deviation?
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