16. According to a recent report, people smile an averageof µ = 62 time per day. Assuming that the distribu-tion of smiles is approximately normal with a standarddeviation of ơ = 18, find each of the following values.a. What proportion of people smile more than80 times a day?b. What proportion of people smile at least 50 timesa day?%3Dla wonorted the results of adebitBankMobil

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Answered: a. What proportion of people smile more…

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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Suppose that 25% of patients with MI in 2000 died within24 hours. This proportion is called the 24-hour case-fatalityrate. 7.14 Of the 15 new MI cases in the preceding study,5 died within 24 hours. Test whether the 24-hour casefatality rate changed from 2000 to 2010
An entire population has mean of μ = 17.4 andstandard deviation of σ = 3.2.By using Chebyshev’s Theorem, determine the least percentage of the population of X,whose value is between 13.7 and 25.2
For an experiment involving 3 levels of factor A and 3 levels of factors B with a sampleof n=8 in each treatment condition. What are the df values for F- ratio for AxB intreaction?
The incidence of a certain type of chromosome defect inthe U.S. adult male population is believed to be 1 in 75.A random sample of 800 individuals in U.S. penal institutionsreveals 16 who have such defects. Can it be concludedthat the incidence rate of this defect among prisonersdiffers from the presumed rate for the entire adultmale population?
4.A new vitamin supplementation program is intended to decrease average resting heart rate inindividuals at risk for hypertension. Assume that a team of researchers are hopeful that restingheart rate in their population will get down to less than 68 bpm, in a population with a standarddeviation of 2 bpm. In order to test this goal reduction, the team gathers a SRS of 273participants in their program and calculates a sample average resting heart rate of 74 bpm.A) Carry out a one sample Z test to determine if the team can conclude that the supplementationprogram is successful in meeting their goal reduction in resting heart rate. Use an α=0.05.B) Construct a 95% Confidence interval about the sample mean, and interpret the result.
Between 1971 and 1975, as part of the National Health and Nutrition Examination Survey (NHANES), 7,381 persons ages 40–77 years were enrolled in a follow-up study. At the time of enrollment, each study participant was classified as having or not having diabetes. During 1982–1984, enrollees were documented either to have died or were still alive. The results are summarized as follows. 1. Of the men enrolled in the NHANES follow-up study, calculate the ratio of non-diabetic to diabetic men. 2. Calculate the proportion of men in the NHANES follow-up study who were diabetics. 3. Calculate the proportion of deaths among men.
5. An engineer who is studying the tensile strength of a steel alloy intended for use in golf clubshafts knows that tensile strength is approximately normally distributed with σ = 60 psi. A randomsample of 12 specimens has a mean tensile strength of = 3450 psi. Calculate the critical valueand z-value of the sample mean and test the hypothesis that the mean strength is 3500 psi. Use α= 0.01.

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a. What proportion of people smile more than 80 times a day? D. What proportion of people smile at least 50 times a day? 1a monorted the