More arrows The archer in Exercise 18 will be shooting 200 arrows in a large competition. a) What are the mean and standard deviation of the number of bulls-eyes she might get? b) Is a Normal model appropriate here? Explain. c) Use the 689599.7 Rule to describe the distribution of the number of bulls-eyes she may get. d) Would you be surprised if she made only 140 bullseyes? Explain.

Week 10 8 November 2016 Basic Statistics for Research Professor HK Dong Wendy Liu Population Margin of Error: Conservative margin of error: use Sample size needed to obtain certain margin of error: Statistical methods Descriptive statistics Inferential statistics o Estimation (confidence intervals) o Hypothesis testing Hypothesis testing – inferential procedure that uses sample data to evaluate the credibility of a hypothesis about the population H a alternative hypothesis Research hypothesis you wish to establish H 0 null hypothesis Nullifies the research hypothesis 1. State the hypothesis 2. Define the decision method 3. Gather data 4. Make a decision a. Reject the H 0