Question 2: compute a 95% confidence interval for the average salary of all electrical engineers. A random sample of 47 electrical engineers is used to estimatethe average salary of all electrical engineers. The average salaryof the sample is $91,000 with a standard deviation of $50,000.Compute a 95% confidence interval for the average salary ofall electrical engineers.($76,319.45, $105,680.55)O ($80,290.11, $120,800.34)($55,281.79, $150,000.01)($76,705.49, $105,294.51)

Answered: Image /qna-images/answer/79347d98-42aa-4f2a-9b76-a5421e589ce5.jpg

Answered: A random sample of 47 electrical…

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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If n= 100 and x= 80, construct a 99% confidence interval. Give your answers to three decimals
DII Given below are the sample means for fifteen samples consisting of five data values each. Assume that the mean of the sample means is ten and the computed values for the UCL and LCL of the chart are 15 and 5, respectively. Below is the chart. Is this process in statistical control? Why or why not? Select the best answer choice. Sample 1 2 3 Mean 9 11 6 17+ 16- 15 14+ 13+ 12+ 11+ 10- 9. 8+ 7- 6 5 4. 3- 2- 1- R Submit Question $ F4 % -1 + O No, because there are eight consecutive points all above or all below the centerline. O No, because there is a point lying beyond the upper or lower control limit. O No, because there is a pattern, trend, or cycle that is obviously not random. O No, because more than one of the answer choices above are correct. O Yes, this process is within statistical control. 5 T 4 5 12 9 ▬▬ FS 6 7 8 11 7 8 6 6 Y H 49 9 10 12 16 F6 8 & 7 9 U 11 12 6 13 J 10 F7 11 13 14 15 12 11 7 8 12 PrtScn 13 FB K 15 9 UCL centerline LCL Home 16 Q F9 L ) End 0 F10 A PgUp ☎
QUESTION 23 Ali constructed a 98% confidence interval for the mean amount spent per day in a shopping mall based on 100 customers. The confidence interval was found to be (AED 1150, AED 2150). Select all correct answers. The mean amount spent per day by the 100 customers selected in the sample falls between AED 1150 and AED 2150. We are 98% confident that the mean amount spent per day by customers falls between AED 1150 and AED 2150. The mean amount spent per day by all customers falls between AED 1150 and AED 2150. 98% of all customers spent between AED 1150 and AED 2150 per day.
Question 10 Express the confidence interval 21.3 % + 7.6 % in interval form. Express the answer in decimal format (do not enter as percents).
if n = 42, p = 0.6 then construct the 98% confidence interval for the population proportion.
If n=470 and p̂ (p-hat) = 0.65, construct a 95% confidence interval.
According to a poll, 81% of California adults (410 out of 506 surveyed) feel that education is one of the top issues facing California. We wish to construct a 90% confidence interval for the true proportion of California adults who feel that education is one of the top issues facing California.What is a point estimate for the true population proportion?
8.2 Question 3). According to the February 2008 Federal Trade Commission report on consumer fraud and identity theft, Arkansas had 1,601 complaints of identity theft out of 3,482 consumer complaints ("Consumer fraud and," 2008). Calculate a 90% confidence interval for the proportion of identity theft in Arkansas.
If n=430 and (p-hat) = 0.67, construct a 90% confidence interval. Give your answers to three decimals
Identify the t score for a 99% confidence interval if the sample size is 35 t=
If n=230 and p (p-hat) = 0.61, construct a 95% confidence interval. Give your answers to three decimals
QUESTION 28 A car insurance company wanted information about the age of its customers. A researcher computed 90%, 95%, 97%, and 99% confidence intervals for the population mean age of the customers. Which of the following intervals is the the 95% confidence interval for the population mean age? (36.30, 39.70) (36.70, 39.30) (36.56, 39.44) (36.91, 39.09)

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