WK 5(2)

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Apr 26, 2024

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Week 5 Knowledge Check Homework Practice Questions - Re… Attempt 2 of 4 Written Apr 3, 2024 10:20 PM - Apr 4, 2024 12:42 AM Attempt Score 15.5 / 20 - 77.5 % Overall Grade (Highest Attempt) 15.5 / 20 - 77.5 % Question 1 1 / 1 point ___ 178___ Hide ques±on 1 feedback The population standard deviation for the height of college basketball players is 3.4 inches. If we want to estimate 95% confidence interval for the population mean height of these players with a 0.5 margin of error, how many randomly selected players must be surveyed? (Round up your answer to nearest whole number) Answer: Z-Critical Value = NORM.S.INV(.975) = 1.96 n = n =
Question 2 1 / 1 point Select the correct answer for the blank: If everything else stays the same, the required sample size ____ as the confidence level increases to reach the same margin of error. Answer: Question 3 0 / 1 point ___ 60___ (61) Hide ques±on 3 feedback Increases Decreases Remains the same The population standard deviation for the height of college football players is 3.3 inches. If we want to estimate a 90% confidence interval for the population mean height of these players with a 0.7 margin of error, how many randomly selected players must be surveyed? (Round up your answer to nearest whole number) Answer: Z-Critical Value =NORM.S.INV(.95) = 1.645 n = n =
Question 4 1 / 1 point ___ 118___ Hide ques±on 4 feedback Question 5 0 / 1 point ___ 139.1___ (140) Hide ques±on 5 feedback The population standard deviation for the height of college basketball players is 3 inches. If we want to estimate 97% confidence interval for the population mean height of these players with a 0.6 margin of error, how many randomly selected players must be surveyed? (Round up your answer to nearest whole number) Answer: Z-Critical Value = NORM.S.INV(.985) = 2.17009 n = n = A researcher would like to estimate the proportion of all children that have been diagnosed with Autism Spectrum Disorder (ASD) in their county. They are using 95% confidence level and the CDC national estimate that 1 in 68 ≈ 0.0147 children are diagnosed with ASD. What sample size should the researcher use to get a margin of error to be within 2%? Round up to the nearest integer. Answer Z-Critical Value = NORM.S.INV(.975) = 1.96
Question 6 1 / 1 point ___ 239___ Hide ques±on 6 feedback Question 7 1 / 1 point n = The population standard deviation for the height of college basketball players is 3 inches. If we want to estimate a 99% confidence interval for the population mean height of these players with a 0.5 margin of error, how many randomly selected players must be surveyed? (Round up your answer to nearest whole number) Answer: Z-Critical Value = NORM.SINV(.995) = 2.575 n = n = The population standard deviation for the height of college baseball players is 3.2 inches. If we want to estimate 90% confidence interval for the population mean height
___ 57___ Hide ques±on 7 feedback Question 8 0 / 1 point A random sample of 150 people was selected and 12% of them were left handed. Find the 90% confidence interval for the proportion of left-handed people. Hide ques±on 8 feedback of these players with a 0.7 margin of error, how many randomly selected players must be surveyed? (Round up your answer to nearest whole number) Answer: Z-Critical Value = NORM.S.INV(.95) = 1.645 n = n = (.12, .88) (0.0764, 0.1636) (0.0436, 0.1164) (–1.645, 1.645) (0.068, 0.172) Z-Critical Value = NORM.S.INV(.95) = 1.645
Question 9 1 / 1 point In a random sample of 200 people, 135 said that they watched educational TV. Find the 95% confidence interval of the true proportion of people who watched educational TV. Hide ques±on 9 feedback LL = .12 - 1.645* UL = .12 + 1.645*
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