Chapter 8: Confidence Intervals (Proportions) Progress saved Done Score: 8/20 8/20 answered Question 17 0/1 pt A smart phone manufacturer is interested in constructing a 95% confidence interval for the proportion of smart phones that break before the warranty expires. 81 of the 1620 randomly selected smart phones broke before the warranty expired. Round answers to 4 decimal places where possible. a. With 95% confidence the proportion of all smart phones that break before the warranty expires is between and b. If many groups of 1620 randomly selected smart phones are selected, then a different confidence interval would be produced for each group. About percent of these confidence intervals will contain the true population proportion of all smart phones that break before the warranty expires and about percent will not contain the true population proportion. Hint: Hints Video # [+] O 2 9 190F ~ 16 18 19 144 110 112 ins prt se delete & 6 8 Y O PChapter 8: Confidence Intervals (Proportions) Progress saved Done Score: 8/20 8/20 answered Question 14 0/1 pt Assume that a sample is used to estimate a population proportion p. Find the 9% confidence interval for a sample of size 351 with 83% successes. a. Enter your answer as an open-interval (i. e., parentheses) using decimals (not percents) accurate to three decimal places. Confidence interval = b. Express the same answer as a tri-linear inequality using decimals (not percents) accurate to three decimal places. c. Express the same answer using the point estimate and margin of error. Give your answers as decimals, to three places. F Question Help: Message instructor Submit Question O 190F hp 6 7 19 144 10 $11 112 import sc delete & 8 O O PDue Sunday by 11:59pm Points 20 Submitting an external tool Chapter 8: Confidence Intervals (Proportions) Progress saved Score: 8/20 8/20 answered Question 12 Express the confidence interval (26 % , 35.8 % ) in the form of p + E. Question Help: Message instructor Submit Question O 2 190F A 16 0 17 8 19 144 10 $12 DDI prt sc & 5 6 8 9