In Exercises 536, express all probabilities as fractions. Social Security Numbers A Social Security number consists of nine digits in a particularorder, and repetition of digits is allowed. If randomly selecting digits for one Social Securitynumber, what is the probability that you get the Social Security number of the president?
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
