Reading proficiency: An educator wants to construct a 95% confidence interval for the proportion of elementary school children in Colorado who are proficientin reading.Part: 0 / 3Part 1 of 3(a) The results of a recent statewide test suggested that the proportion is 0.62. Using this estimate, what sample size is needed so that the confidenceinterval will have a margin of error of 0.04?A sample of elementary school children is needed to obtain a 95% confidence interval with a margin of error of 0.04.X3

Answered: Image /qna-images/answer/1a9b0101-ee3a-4c8f-bbd8-317a16eba43f.jpg

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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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
Determine whether the following statement is true or false. To construct a confidence interval about the mean, the population from whlch the sample is drawn must be approximately normal. This statement 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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