A random sample of 138 first years, 80 indicated that they would use the school's library more if the hours were extendedIn an independent random sample of 96 second years, 73 responded that they would use the library more if the hours wereextended. Let P, and P, be the proportion of all second years and first years, respectively. Using a 95% confidence level.2.Determine the point estimate ofP-Pa) 0.181b)-0.181c) 0.062d) 0.300

We have given that, X1 = 80, N1 = 138 and X2 = 73, N2 = 96 Then, We will find the 95% confidence…

Answered: A random sample of 138 first years, 80…

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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2. A group of students working on their thesis took a random sample of 100 families in a certain slum area in order to determine the mean monthly income in the area. The results were x= P1,146 and s= P 650 Construct a 90% confidence interval for the mean income of all families in this slum area.
A research study reported a 95% confidence interval for the mean time of hip surgeries based on a sample of 91 patients as (116 minutes, 138 minutes). Which of the following statements is correct about the given interval? A. Correct B. Incorrect - We are 100% sure that the mean time of hip surgeries of the sampled 91 patients is between 116 and 138 minutes. -95% of the hip surgeries of the sampled 91 patients will fall between 116 and 138 minutes. We are 100% sure of hip surgeries take between 116 and 138 minutes. We are 95% sure that hip surgeries will take, on average, 116 to 138 minutes.
A researcher comparing the means of dependent samples consisting of 30 matched pairs and obtained a mean difference of 5 and a standard error of the mean difference of 2. The confidence interval for the mean difference was (1.6, 8.4). What confidence level was used in constructing the interval?
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a simple random sample of 9 college freshmen were asked how many hour of sleep they typically got per night. The results were 8.5,6.5,8,9,6,7.5,24,8.5,9.5. Elminate the outlier, then consturct a 90% confidence interval for the mean amount of sleep from the remaining values.
A recent survey showed that 42% of US employers were likely to require higher employee contributions for health care coverage. Suppose the survey was based on a sample of 500 companies. Find the 99% confidence interval for the proportion of all companies likely to require higher employee contributions for health care coverage. (Round to four decimal places)
In a preelection poll, a pollster finds that 442 out of 650 people polled favor Smith. Construct the 95% confidence interval for the proportion (nearest to 0.0001) of people in the whole population who favor Smith.
Based on a sample of 1000 adult Americans, USA Today reported that 840 of them preferred cheese on their burgers. Calculate and interpret an 88% confidence interval for the proportion of all adult Americans who prefercheese on their burgers.
From the estimation of the number of aggravated assault (816,760) in 2015 at a 99% confidence interval, what is the lower limit?
A random sample of high school seniors were asked whether they were applying for college. The resulting confidence interval for the proportion of students applying for college is (0.65,0.69). What is the margin of error?
The following table provides the Noradrenaline concentration (µmol/g of creatinine) obtained by analyzing the urine of healthy volunteers between twenty and thirty years of age. Male 0,48 0,36 0,20 0,55 0,45 0,46 0,47 0,23 Female 0,35 0,37 0,27 0,29 Can noradrenaline concentrations be considered to be significantly different between the sexes (considering the 95% confidence level)? Carry out the appropriate hypothesis test, clearly showing how the calculated, critical values (confidence level and degrees of freedom) were obtained and concluding in full whether the null hypothesis is true or not.

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