2. The following data was collected in a clinical trial evaluating a new compound designed to improve wound healing in trauma patients. The new compound is compared against a placebo. After treatment for 5 days with the new compound or placebo the extent of wound healing is measured and the data are shown below. Percent Wound Healing 51-75% Treatment 0-25% 26-50% 76-100% New Compound (n=125) Placebo (n=125) 15 37 32 41 36 45 34 10 Is there a difference in the extent of wound healing by treatment? (Hint: Are treatment and the percent wound healing independent?) P-value < 0.005 at a 5% level of significance.

6. A cigarette manufacturer has designed a new filter for the filtered cigarettes it produces. The following hypotheses are being tested: Ho: the new filter is effective in reducing tar H₁: the new filter is not effective in reducing tar Would concluding that the new filter is effective in reducing tar when it actually is not effecuve be an example of a Type 1 or Type 2 error? Would this be a serious error to make? Explain.

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4. The decision-making process A graduate student believes that people consider faces with more contrast between lip color and skin tone as more feminine. She identifies the null and alternative hypotheses as: Ho: The level of contrast between lip color and skin tone does not affect how feminine a face is considered. H1: The level of contrast between lip color and skin tone affects how feminine a face is considered. She chooses a significance level of 0.01. After she collects the data and computes the sample statistics, it is time for her to make a decision about Ho. Check the two possible decisions that the graduate student can make given her choices of Ho and H1. Check all that apply. O There is not enough evidence to reject the hypothesis that the contrast between lip color and skin tone does not affect how feminine a face is considered. O There is not enough evidence to reject the hypothesis that the contrast between lip color and skin tone affects how feminine a face is…

A company manufacturing CDs is working on a new technology. A random sample of 717 Internet users were asked "As you may know, some CDs are being manufactured so that you can only make one copy of the CD after you purchase it. Would you buy a CD with this technology, or would you refuse to buy it even ifit was one you would normaly buy?" Of hose usert, 56% responded that they would buy the CD. Complete parts a and b below a) Create a 90% confidence interval for this percentage 口口 (Round to three decimal places as needed, Use ascending order.)