You may need to use the appropriate appendix table or technology to answer this question.A random sample of 85 airline pilots recruited by an airline service had an average yearly income of $99,000 with a standard deviation of $11.000.(a) If we want to determine a 95% confidence interval for the average yearly income of the population, what is the value of e? (Round your answer to three decimalplaces)-1.900x(b) Develop a 95% confidence interval for the average yearly income of all pilots (in dollars). (Round your answers to the nearest dollar)$97.915Xto's 101.005X

Sample size Sample mean Standard deviation

Answered: You may need to use the appropriate…

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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QUESTION 14 A survey of 88 men found that an average amount spent on St. Patrick's day of $60 with a standard deviation of $18. A similar survey of 86 women found they spent an average of $42 with a standard deviation of $20. When testing the hypothesis (at the 5% level of significance) that men spend more than women on St. Patrick's day, what is the test statistic? (please round your answer to 2 decimal places)
You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately σ=72.1σ=72.1. You would like to be 99% confident that your estimate is within 2 of the true population mean. How large of a sample size is required?
Question 11:
Now you know the range and interquartile range for the age variable...but you are concerned because both of these measures of variability are flawed (in fact, you can easily list the drawbacks of each measure because you have studied so well!). So, you realize it is also important to check out the standard deviation.You use SPSS and find that the standard deviation for the age variable is ________. Enter your answer rounded to two decimal places (i.e., 10.11, not 10, not 10.1, not 10.110).
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question 5
(Continuing from the last question, with the same values) A researcher is interested in testing whether college students send more or fewer texts per day, relative to the general population. The researcher finds out that the population average of texts sent per day is µ = 112, but is unable to find out the population standard deviation. This researcher then recruits 25 college students, and asks about their texting. They report a sample mean of M = 120, with a SS= 1200 In the last question, you computed the estimated standard error (sM) For this question, compute the value of the t-test. t =?
Question 22 SAT scores are distributed with a mean of 1,500 and a standard deviation of 300. You are interested in estimating the average SAT score of first year students at your college. If you would like to limit the margin of error of your 95% confidence interval to 25 points, how many students should you sample? > Next Question hp Ce % & 3. 7 8 9 16 %24
Question 3 Todd wants to estimate a population mean age of the incoming fall term transfer students. Based on previous evidence, he believes the population standard deviation is approximately o = 7.5 years. Todd would Like to be 90% confident that his estimate is within 1.8 years of the true population mean, and asks you to help him determine the appropriate minimum sample size. How large of a sample size should Todd use? people
QUESTION 7 Your statistics instructor wants you to determine a confidence interval estimate for the mean test score. Past experience indicated that tests scores are normally distributed with a sample mean of 160 and a population standard deviation of 45. The critical value to estimate a 95% confidence interval of the population means is A. 1.645 B. 1.96 OC. 2.021 D. 1.684

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