A personnel manager has found that, historically, the scores on aptitude tests given to applicants for entry-level positions follow a normal distribution with standard deviation 23.2 points. A random sample of 13 test scores from the current group of applicants had a mean score of 73.82 points. Based on these sample results, a statistician found for the population mean a confidence interval extendingfrom 61.5301 to 86.1099 points. Find the confidence level (as a value between zero and one) of this interval.

Answered: A personnel manager has found that,…

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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To determine the views of students on a particular campus about fraternities, an 11-point attitude scale was administered to a random sample of 25 students. This survey yielded a sample mean of 5 (the higher the score, the more favorable the view of the fraternities) and a standard deviation of 1.5. Find the 95% confidence interval for the population mean.
In a sample of 90 large grade A eggs, the mean number of calories was 64 with a standard deviation of 2.5. In a sample of 85 large grade AA eggs, the mean number of calories was 86 with a standard deviation of 2.7. Find a 98% confidence interval for the difference in the mean numbers of calories between grade AA and grade A eggs. (Round the final answer to three decimal places.)
A personnel manager has found that, historically, the scores on aptitude tests given to applicants for entry-level positions follow a normal distribution with standard deviation 22.57 points. A random sample of 13 test scores from the current group of applicants had a mean score of 69.78 points. Based on these sample results, a statistician found for the population mean a confidence interval extending from 58.0742 to 81.4858 points. Find the confidence level (as a value between zero and one) of this interval.
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?
Researchers from a certain country were interested in how characteristics of the spleen of residents in their tropical environment compare to those found elsewhere in the world. The researchers randomly sampled 91 males and 109 females in their country. The mean and standard deviation of the spleen lengths for the males were 10.9 cm and 0.9 cm, respectively, and those for the females were 9.8 cm and 1.1 cm, respectively. Determine a 95% confidence interval for the difference between mean spleen lengths of males and females in this country. Click here to view page 1 of the table of critical values of t. Click here to view page 2 of the table of critical values of t. Let population 1 be all males in the country and let population 2 be all females in the country. The 95% confidence interval for µ1 - 4½ is ( | D (Round to three decimal places as needed. Use ascending order.)
A study by the department of education of a certain state was trying to determine the mean SAT scores of the graduating high school seniors. The study examined the scores of a random sample of 190 graduating seniors and found the mean score to be 520 with a standard deviation of 87. Determine a 95% confidence interval for the mean, rounding all values to the nearest tenth.
A personnel manager has found that, historically, the scores on aptitude tests given to applicants for entry-level positions follow a normal distribution with standard deviation 21.5 points. A random sample of 15 test scores from the current group of applicants had a mean score of 68.86 points. Based on these sample results, a statistician found for the population mean a confidence interval extending from 59.4783 to 78.2417 points. Find the confidence level (as a value between zero and one) of this interval.
At a large high school, an assistant principal wants to know how intelligent the students at the school are. An intelligence test is administered to an SRS of 50 students, out of over 2000 students. The mean score was 115 and the standard deviation was 15. Construct a 99% confidence interval for the mean score of all students in the school. A) (109.32, 120.69) B) (119.58, 123.50) C) (110.87, 129.41) D) Can not be determined from the information given.
A personnel manager has found that, historically, the scores on aptitude tests given to applicants for entry-level positions follow a normal distribution with standard deviation 25.86 points. A random sample of 13 test scores from the current group of applicants had a mean score of 70.92 points. Based on these sample results, a statistician found for the population mean a confidence interval extending from 57.8665 to 83.9735 points. Find the confidence level (as a value between zero and one) of this interval

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