# Chapter 19 Confidence Intervals for Proportions

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1 Chapter 19 Confidence Intervals for Proportions Use your TI calculator to find the confidence interval. You must know the number of successes, the sample size and confidence level. Under STAT go to TESTS. Scroll down to A:I PropZInt. Enter the number of successes and sample size. Specify the confidence level. Highlight calculate and press Enter. Know common critical values, z *, and how to find them: 80% confidence level: 90% confidence level: 95% confidence level: 1

2 What Can Go Wrong? 2

3 3

4 Drinking. A national health organization warns that 30% of middle school students nationwide have been drunk. Concerned, a local health agency randomly and anonymously surveys 110 of 1212 middle school students in its city. Only 21 of them report having been drunk. a. What proportion of the sample reported having been drunk? b. Does this mean that this city's youth are not drinking as much as the national data would indicate? Explain. 4

5 c. Create a 95% confidence interval for the proportion of the city's middle school students who have been drunk. d. Is there and reason to believe that the national level of 30% is not true of the middle school students in this city? 5

6 18. Junk Mail. Direct mail advertisers send solicitations (a.k.a. "junk mail") to thousands of potential customers in the hope that some will buy the company's product. Suppose a company wants to test the response to a new flyer, and sends it to 1000 people randomly selected from their mailing list of over 200,000 people. They get orders from 123 of the recipients. a. Create a 90% confidence interval for the percentage of people the company contacts who may buy something. b. Explain what this interval means. 6

7 c. Explain what "90% confidence" means. d. The company must decide whether to now do a mass mailing. The mailing won't be cost effective unless it produces at least a 5% return. What does your confidence interval suggest? Explain. 7

8 22. Gambling. A city ballot includes a local initiative that would legalize gambling. The issue is hotly contested and two groups decide to conduct polls to predict the outcome. The local newspaper finds that 53% of 1200 randomly selected voters plan to vote "yes," while a college Statistics class finds 54% of 450 randomly selected voters in support. Both groups create a 95% confidence interval. a. Without finding the confidence intervals, explain which one will have the larger margin of error. 8

9 b. Find both confidence intervals. c. Which group concludes that the outcome is too close to call? Why? 9

10 24. Pregnancy. In 1998 a San Diego reproductive clinic reported 49 live births to 207 women under the age of 40 who had previously been unable to conceive. a. Find a 90% confidence interval for the success rate at this clinic. 10

11 b. Interpret your interval in this context. c. Explain what "90% confidence" means. d. Would it be misleading for the clinic to advertise a 25% success rate? Explain. 11

12 26. Back to Campus again. In 2004 ACT, Inc., reported that 74% of 1644 randomly selected college freshmen returned to college the next year. the study was stratified by type of college public or private. The retention rates were 71.9% among 505 students enrolled in public colleges and 74.9% among 1139 students enrolled in private colleges. a. Will the 95% confidence interval for the true national retention rate in private colleges be wider or narrower than the 95% confidence interval for the retention rate in public colleges? Explain. b. Do you expect the margin of error for the overall retention rate to be larger or smaller? Explain. 12

13 HW p. 456; odd ANS 13

### = 2.0702 N(280, 2.0702)

Name Test 10 Confidence Intervals Homework (Chpt 10.1, 11.1, 12.1) Period For 1 & 2, determine the point estimator you would use and calculate its value. 1. How many pairs of shoes, on average, do female

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