A state legislature mandates the each school district in its state must conduct an audit of the performance of the district’s students on the state reading exam. The purpose is to determine if there are any extreme increases in the individual schools in the district. There are currently four software programs that are capable of conducting the audits with varying degrees of efficiency. The state board of education hires an analyst to design a study to evaluate each of the software programs. The study will involve a random sample of schools running the software on their records. One of the metrics in the evaluation will be the amount of time that the software takes to complete the audit. From the application of the software in other states, the standard deviation in the time to complete the audit was 122.5 minutes. Determine how many schools are required in the study for each software program in order to be able to detect a difference in any pair of software programs of 5 hours using a level .05 test with a power of 90%.
Answer to relevant QuestionsA researcher seeks funding for a study from a federal agency. The study will involve the evaluation of three factors, each having two levels. From the literature, the researcher approximates the standard deviation in the ...Refer to Exercise 14.20. a. Test for an interaction between the effects of Mn and Cu on soybean yield. Use α = .05. b. What level of Mn appears to produce the highest yield? c. What level of Cu appears to produce the ...Refer to Exercise 14.27. a. Construct an AOV table for the experiment. b. Are the differences in mean temperatures for the nine medications the same for all three severities of the blood pressure disorders? Use α = .05. c. ...A manufacturer whose daily supply of raw materials is variable and limited can use the material to produce two different products in various proportions. The profit per unit of raw material obtained by producing each of the ...Refer to Exercise 14.5. When the normality condition is violated, an alternative to the F test is the Kruskal– Wallis test (see Section 8.6). a. Test for differences in the median outputs of the four incentive plans. Use ...
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