Refer to the data set of flower sizes in IRIS.xlxs . Locate this file in Canvas in the ANOVA module. Use a 0.05 significance level to test the claim that the three different species come from...

1. Refer to the data set of flower sizes inIRIS.xlxs. Locate this file in Canvas in the ANOVA module. Use a 0.05 significance level to test the claim that the three different species come from populations having the same mean petal width.


2. Refer to the data set for a clinical trial of a pulse-lowering medication in fileHomework Assignment 11 Pulse-lowering drug - data only.xlsxin the ANOVA module. The project manager in charge of this study decided to not have a confounding variable of gender, and therefore limited the trial to male subjects only. For adult males the heart rates are normally distributed with a mean of around 70 beats per minute and a standard deviation of 11 beats per minute. The summary report states that the drug is effective, based on this evidence: The placebo group has a mean pulse rate of 68.9, which is close to the value of 70 beats per minute for adult males in general, but the group treated with a 10 mg dose of medication has a lower pulse rate of 66.2, and the group treated with 20 mg dose has the lowest mean pulse rate of 65.2.
   
   
   • Based on the results, does it appear that there is sufficient evidence to support the claim that the drug lowers pulse rates?
   
   
   • Are there any problems with the design of the experiment?
   
   
   • Given that only males were involved in the study, do the results also apply to females?
   
   
   • The project manager compared the post-treatment pulse rates to the mean pulse rate for adult males. Is there a better way to measure drug’s effectiveness in lowering pulse rates?
   
   
   • How would you characterize the overall validity of the experiment?
   
   
   • Should this drug be approved?
   
   
   
   

Problems are due in the last meeting (Q&A before the Final Exam)

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