Reading proficiency: An educator wants to construct a 99.8% confidence interval for the proportion of elementary school children inColorado who are proficient in reading.Part: 0 / 3Part 1 of 3(a) The results of a recent statewide test suggested that the proportion is 0.64. Using this estimate, what sample size is needed sothat the confidence interval will have a margin of error of 0.05?A sample ofelementary school children is needed to obtain a 99.8% confidence interval with amargin of error of 0.05. How's the economy? A pollster wants to construct a 90% confidence interval for the proportion of adults who believe that economicconditions are getting better.Part: 0 / 2Part 1 of 2(a) A poll taken in July 2010 estimates this proportion to be 0.24. Using this estimate, what sample size is needed so that theconfidence interval will have a margin of error of 0.05?A sample ofadults is needed to obtain a 90% confidence interval with a margin of error of 0.05.

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Answered: Reading proficiency: An educator wants…

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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part 2
A study has been conducted of the airspeed of various bird species. You would like to specify the difference in airspeed. The following information is obtained. 1. What multiplier should I use for 95% confidence interval? 2. Can you construct a confidence interval for the difference? 3. Does that interval support the hypothesis that there is a difference in the airspeed of these two species?
Sh2
In a study of speed dating, male subjects were asked to rate the attractiveness of their female dates, and a sample of the results is listed below (1=not attractive; 10=extremely attractive). Construct a confidence interval using a 90% confidence level. What do the results tell about the mean attractiveness ratings of the population of all adult females? 6, 9, 2, 9, 6, 5, 8, 7, 7, 10, 5, 9
Use R Studio to answer the following question:
CEO compensation A sample of 20 CEOs from theForbes 500 shows total annual compensations rangingfrom a minimum of $0.1 to $62.24 million. The averagefor these 20 CEOs is $7.946 million. Here’s a histogram:Based on these data, a computer program found that a 95%confidence interval for the mean annual compensationof all Forbes 500 CEOs is (1.69, 14.20) $ million. Whyshould you be hesitant to trust this confidence interval?
The accompanying data set gives the additional sleep in hours obtained by a sample of 10 patients using a certain sleep aid. Preliminary data analyses indicate that the t-interval procedure can reasonably be applied. Complete parts (a) and (b) below. Click here to view the additional sleep hours. Click here to view page 1 of the t-table. Click here to view page 2 of the t-table. ..... a. Obtain and interpret a 99% confidence interval for the additional sleep that would be obtained on average for all people using the sleep aid. (Note: x = 2.50 hr and s= 2.017 hr.) The 99% confidence interval is from hour(s) to hour(s). (Round to two decimal places as needed.) Additional sleep hours 2.2 1.4 0.0 5.7 4.7 1.1 0.1 4.5 1.6 3.7 Print Done
Boys and girls: The National Health Statistics Reports reported that a sample of 311 one-year-old boys had a mean weight of 25.3 pounds with a standard deviation of 3.6 pounds. In addition, a sample of 287 one-year-old girls had a mean weight of 24.2 pounds with a standard deviation of 4.0 pounds. Part: 0 / 2 0 of 2 Parts Complete Part 1 of 2 Construct a 95 % confidence interval for the difference between the mean weights. Let μ1 denote the mean weight of one-year-old boys. Use tables to find the critical value and round the answers to at least one decimal place. A 95 % confidence interval for the difference between the mean weights is
A. True or False? A researcher compares the BMI of two populations of individuals from different socioeconomic backgrounds and finds that the proportion of individuals considered obese and from a poor background is .37 (n = 112), and the proportion of individuals considered obese and from an affluent background is .27 (n = 87); a 95% confidence interval for the risk difference for obesity among members of the poor population compared to the affluent population is (-0.03, 0.23). B. Why is it true or false?
In a study of speed dating, male subjects were asked to rate the attractiveness of their female dates, and a sample of the results is listed below (1=not attractive; 10=extremely attractive). Construct a confidence interval using a 90% confidence level. What do the results tell about the mean attractiveness ratings of the population of all adult females? 5,7,2,9,4,4,6,9,7,8,6,8
also, what is the lower and upper limits ?
In a study of speed dating, male subjects were asked to rate the attractiveness of their female dates, and a sample of the results is listed below (1=not attractive; 10=extremely attractive). Construct a confidence interval using a 90% confidence level. What do the results tell about the mean attractiveness ratings of the population of all adult females? 7, 7, 3, 8, 4, 5, 7, 7, 7, 10, 5, 9

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