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Student's t-test

test 9a 2

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? 2011 BFW Publishers The Practice of Statistics, 4/e- Chapter 9 431 Test 9A AP Statistics Name: Part 1: Multiple Choice. Circle the letter corresponding to the best answer. 1. In a test of H0: p = 0.7 against Ha: p z 0.7, a sample of size 80 produces z = 0.8 for the value of the test statistic. Which of the following is closest to the P-value of the test? (a) 0.2090 (b) 0.2119 (c) 0.4238 (d) 0.4681 (e) 0.7881 2. An opinion poll asks a simple random sample of 100 college seniors how they view their job prospects. In all, 53 say ?good.? Does the poll give convincing evidence to conclude that more than half of all seniors think their job prospects are good? If p = the proportion of all

test 9a

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? 2011 BFW Publishers The Practice of Statistics, 4/e- Chapter 9 431 Test 9A AP Statistics Name: Part 1: Multiple Choice. Circle the letter corresponding to the best answer. 1. In a test of H0: p = 0.7 against Ha: p z 0.7, a sample of size 80 produces z = 0.8 for the value of the test statistic. Which of the following is closest to the P-value of the test? (a) 0.2090 (b) 0.2119 (c) 0.4238 (d) 0.4681 (e) 0.7881 2. An opinion poll asks a simple random sample of 100 college seniors how they view their job prospects. In all, 53 say ?good.? Does the poll give convincing evidence to conclude that more than half of all seniors think their job prospects are good? If p = the proportion of all

chapter 11.3

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PreTest 11A AP Statistics Name:KEY Directions: Work on these sheets. Tables and formulas appear on a separate sheet. Part 1: Multiple Choice. Circle the letter corresponding to the best answer

chapter 11

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PreTest 11A AP Statistics Name:KEY Directions: Work on these sheets. Tables and formulas appear on a separate sheet. Part 1: Multiple Choice. Circle the letter corresponding to the best answer

chapter 14 chi square

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AP Statistics ? Chapter 14 Practice Test: The Chi-Square Distributions Part II, Free Response ? Show all work and communicate completely and clearly. 1. Computer software generated 500 random numbers that should look like they are from the uniform distribution on the interval 0 to 1. They are categorized into five groups: (1) less than or equal to 0.2 (2) greater than 0.2 and less than or equal to 0.4, (3) greater than 0.4 and less than or equal to 0.6, (4) greater than 0.6 and less than or equal to 0.8, and (5) greater than 0.8. The counts in the five groups are 113, 95, 108, 99, and 85, respectively. a. The probabilities for these five intervals are all the same. What is this probability?

chapter 11

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AP Statistics Chapter 11 Outline 11.1 Chi-Square Goodness-Of-Fit Tests Chi-Square Statistic The chi-square statistic is a measure of how far the observed counts are from the expected counts: Where the sum is over all possible values of the categorical variable The Chi-Square Distribution The chi-square distributions are a family of distributions that take only positive values and are skewed to the right. A particular chi-square distribution is specified by giving its degrees of freedom. The chi-square goodness-of-fit test uses the chi-square distribution with degrees of freedom = the number of categories - 1. The Chi-Square Goodness-of-Fit Test
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