Part 3 of 6(c) Find the probability that more than 30% of the sampled teenagers own a smartphone.The probability that more than 30% of the sampled teenagers own a smartphone is 0.2666Part: 3/6Part 4 of 6(d) Find the probability that the proportion of the sampled teenagers who own a smartphone is between 0.25 and 0.30.The probability that the proportion of the sampled teenagers who own a smartphone is between 0.25 and 0.30 isPart: 4/6Part 5 of 6(e) Find the probability that less than 30% of sampled teenagers own smartphones.The probability that less than 30% of sampled teenagers own smartphones isPart: 5/6Part 6 of 6(f) Would it be unusual if less than 18% of the sampled teenagers owned smartphones?It (Choose one)XX5be unusual if less than 18% of the sampled teenagers owned smartphones, since the probability isG Smartphones: A poll agency reports that 27% of teenagers aged 12-17 own smartphones. A random sample of 85 teenagers is drawn. Round your answersto at least four decimal places as needed.Part: 0 / 6Part 1 of 6(a) Find the meanThe meanPart: 1/6Part 2 of 6is 0.27(b) Find the standard deviationThe standard deviation G is 0.0482Part: 2/6ŚXS

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MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Find SAT Quartiles. SAT scores are reported on a scale from 600 to 2400. The mean is 1498 and the standard deviation is 316. The quartiles of any distribution are the values with cumulative proportions 0.25, and 0.75. What are the quartiles of the distribution of SAT scores?
Coffee: The National Coffee Association reported that 62% of U.S. adults drink coffee daily. A random sample of 250 U.S. adults is selected. Round your answers to at least four decimal places as needed. Part: 0 / 6 Part 1 of 6 (a) Find the mean µa. The mean ua is 989 P 10 MacBook Air 80 888 F7 F4
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Assume that a randomly selected subject is given a bone density test. Bone density test scores are normally distributed with a mean of 0 and a standard deviation of 1. Draw a graph and find P7, the 7th percentile. This is the bone density score separating the bottom 7% from the top 93%. Which graph represents P7? Choose the correct graph below. A. P7 The bone density score corresponding to P7 is (Round to two decimal places as needed.) B. A P7 2 C. ^ P7 Ly D. A P7
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Dataset Available: Download Houston.xlsx You may need to use the appropriate appendix table or technology to answer this question. Data were collected on the amount spent by 64 customers for lunch at a major Houston restaurant. These data are contained in the file Houston. Based upon past studies the population standard deviation is known with a = $6. 20.50 14.63 23.77 29.96 28.87 15.78 18.16. 12.16 18.89 19.88 23.11 20.11 20.34 27.49 36.55 21.18 19.22 34.13 25.53 27.71 33.81 21.79 29.49 32.70 9.20 20.89 11.22 16.43 17.66 9.59 Need Help? Read It 19.16 26.35 20.01 26.85 13.63 17.22 13.17 20.12 22.11 22.47 20.36 35.47 11.85 17.88 6.83 30.99 18.38 26.85 25.10 20.08 30.36 21.79 14.62 Watch It 18.37 32.27 12.63 27.55 25.87 14.37 15.61 26.46 24.24 16.66 20.85 (a) At 99% confidence, what is the margin of error in dollars? (Round your answer to the nearest cent.) $ (b) Develop a 99% confidence interval estimate of the mean amount spent for lunch in dollars. (Round your answers to the nearest…
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