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Review Sheet for Unit 7 Quiz Gathering Data and Probability Name ______________________________ Vocabulary Population Sample Experiment Observational Study Response Variable Explanatory Variable Simple Random Sample Discrete Variable Continuous Variable Probability Distribution Binomial Distribution Normal Curve Z-Score Standard Normal Distribution Table Empirical Rule Parameter Statistic 1. We toss a coin 5 times. If we want tails, what is the probability of having: a. 2 tails? b. 5 tails? c. At least 3 tails? d. No more than 2 tails? 2. Given: x P(x) 1 .10 2 .45 3 .20 4 .25 a. Show that the two conditions for a valid probability distribution are met. b. Find the mean for this probability distribution. c. What is the standard deviation for this probability distribution? d. Sketch a probability histrogram. 3. What is the difference between a statistic and a parameter? 4. List the four characteristics of a binomial experiment. 5. In Mrs. Knightâs geometry class, her last test had a mean of 75 and a standard deviation of 7. (Hint: find z-score and use the table!) a. What proportion of scores fall below 65? b. What proportion of score fall above 82? 6. What is an explanatory variable? 7. What are treatments? 8. What is a response variable?