When using a calculator, make sure you show appropriate calculator documentation as was shown in the videos to support your answers. No calculator documentation may result in no credit. For all hypothesis testing, assume ? = 0.05 significance level is given. Round all answers to three decimal places past the decimal. You must do calculations on the TI calculator. DO NOT Use the Stats -> Tests for any of the problems (except to check).

Please see attchment

3. EXPERIMENTAL DESIGN A researcher wants to see if special steroid cream relieves skin irritation. She has 100 mice, all suffering from a skin condition called eczema. You will design a randomized experiment to determine the effectiveness of this steroid cream. After the experiment is conducted, each participant is examined and on a scale of 0 (no rash) to 30 (terrible rash), the skin is rated to see how much the skin condition has gone away. a. Diagram the design of a randomized experiment, as done in the videos. Make sure to label the important aspects of the experimental design. (randomization, placebo, treatment, control, blindness, and compare) [7 pts] b. What are the cases in this study? [2pts] c. Which group was the control group? [2pts] d. Identify the variables of interest, and state whether the variable is quantitative or categorical i. Explanatory Variable: _______________________________________________ [2pts] Quantitative or Categorical (circle one) ii. Response Variable: _______________________________________________ [2pts] Quantitative or Categorical (circle one) /15 4|Page