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Q1) There are 3 hospitals in Tulsa, Oklahoma, area. Following data illustrate the number of outpatient surgeries carried out at each hospital last week. At.05 significance level, can we conclude there is a difference in mean number of surgeries performed by hospital or by day of week?
Number of Surgeries Performed
Day
St. Luke's
St. Vincent
Mercy
Monday
14
18
24
Tuesday
20
Wednesday
16
22
Thursday
Friday
28
Q2) Clark Heter is industrial engineer at Lyons Products. He would like to find out whether there are more units produced on afternoon shift than on day shift. A sample of 54 day-shift workers showed that mean number of units produced was 345, with standard deviation of 21. A sample of 60 afternoon-shift workers illustrated that mean number of units produced was 351, with standard deviation of 28 units. At the .05 significance level, is the number of units produced on the afternoon shift larger?
Assume the population standard deviations are not the same. At the .05 significance level, is there a difference in the mean waiting time?
At.01 significance level, can we conclude that there is more variation in selling prices of oceanfront homes?
36 values given here are based on summary statistics from research by cumming. Do you think that these data are normally distributed?
The main purpose of this exercise is to check your understanding of significance level, p-values and power .
When combining probabilities, to find the probability of one event AND another event, the separate probabilities should be
Statewide real estate sales agency, Farm Associates, specializes in selling farm property in state of Nebraska. At.10 significance level, has there been an increase in selling time?
At the .05 significance level, can she conclude that there is a difference in the mean amount of weight loss among the three diets?
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
Carry out the global test of hypothesis to find out whether any of the regression coefficients are not equal to 0. Use.05 level of significance.
Carry out the suitable calculations to test for effect modification. Interpret your results.
Concept of statistical signi cance
Create a scatterlpot of P_RFM and P_HELM. If drawing plot by hand, use graph paper to make sure accuracy. Be sure you label axes. After you have created the scatterplot, consider its form and direction. Recognize outliers, if any.
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