Chapter 8 Confidence Intervals (Proportions _ counts towards your grade)

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Eastern Gateway Community College *

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101

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English

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Dec 6, 2023

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12/1/23, 1:25 PM Chapter 8 Confidence Intervals (Proportions / counts towards your grade) https://egcc.instructure.com/courses/40375/assignments/1211536?module_item_id=3857823 1/5 Question 2 1/1 pt Details Question 3 1/1 pt Details Question 4 1/1 pt Details lege were asked whether they had completed their required English 101 course, and 93 students said "yes". Find the best point estimate for the proportion of students at the college who have completed their required English 101 course. Round to four decimal places. .7623 Question Help: Message instructor A new fertilizer was applied to the soil of 108 bean plants. 55% showed increased growth. Find the margin of error and 95% confidence interval for the percentage of all bean plants which show increased growth after application of the fertilizer. Report answers to at least 2 decimal places. Margin of Error (as a percentage): 9.38 Confidence Interval: 45.62 % to 64.38 % Question Help: Message instructor Assume that a sample is used to estimate a population proportion p . Find the 99.5% confidence interval for a sample of size 375 with 66% successes. Enter your answer as an open-interval ( i.e. , parentheses) using decimals (not percents) accurate to three decimal places. C.I. = .5913,.7287 Question Help: ( ) Message instructor

12/1/23, 1:25 PM Chapter 8 Confidence Intervals (Proportions / counts towards your grade) https://egcc.instructure.com/courses/40375/assignments/1211536?module_item_id=3857823 2/5 Question 5 1/1 pt Details Question 6 1/1 pt Details Question 7 0/1 pt Details Assume that a sample is used to estimate a population proportion p . Find the 99% confidence interval for a sample of size 167 with 110 successes. Enter your answer as an open-interval ( i.e. , parentheses) using decimals (not percents) accurate to three decimal places. C.I. = .5643,.7535 Question Help: ( ) Message instructor If n = 380 and X = 304, construct a 99% confidence interval for the population proportion, p. Give your answers to three decimals .747 < p < .853 Question Help: Message instructor Out of 300 people sampled, 87 had kids. Based on this, construct a 90% confidence interval for the true population proportion of people with kids. Give your answers as decimals, to four places .247 < p < .333 Question Help: Message instructor Giving a test to a group of students, the grades and gender are summarized below A B C Total Male 15 16 18 49 Female 13 14 5 32 Total 28 30 23 81

12/1/23, 1:25 PM Chapter 8 Confidence Intervals (Proportions / counts towards your grade) https://egcc.instructure.com/courses/40375/assignments/1211536?module_item_id=3857823 3/5 Question 8 0/1 pt Details Question 9 0/1 pt Details Question 10 0/1 pt Details Let represent the percentage of all female students who would receive a grade of B on this test. Use a 99.5% confidence interval to estimate p to three decimal places. Enter your answer as a tri-linear inequality using decimals (not percents). < p < Question Help: Video Message instructor Express the confidence interval in the form of a trilinear inequality. % % Question Help: Message instructor Assume that a sample is used to estimate a population proportion p . Find the 99.5% confidence interval for a sample of size 375 with 90% 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. < p < c. Express the same answer using the point estimate and margin of error. Give your answers as decimals, to three places. p = Question Help: Message instructor

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