The average salary of 81 random employees in a certain financial sector was 3400 USD. The sample standard deviation was270 USD. We are interested in the 60% confidence interval for the population mean. What is the value of the ta/2 used?Select one:O a. 0.846O b. 1.990O c. 1.664O d. 2.639O e. 2.374O f.1.292

Answered: Image /qna-images/answer/4fca6eca-0d53-4a2b-9e61-ac1b16638d54.jpg

Answered: The average salary of 81 random…

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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Past experience has indicated that the breaking strength of yarn used in manufacturing drapery material is normally distributed and that o = 3 psi. A random sample of 8 specimens is tested, and the average breaking strength is found to be 98 psi. Find a 95% two-sided confidence interval on the true mean breaking strength. Round the answers to 1 decimal place. susl
Kennedy High School reported that the mean score on an end of semester physics exam wass 508 with a standard deviation of 121. Calculate the margin of error with a 95%confidence level for the data if the sample size was 200 students. A. 14.12% B. 17.95% C. 4.37% D. 16.77%
The amount of trash generated by US households (in lbs per day) is Normally distributed. You take a sample of 10 people. The sample average is xbar=10.91 lbs, and the sample standard deviation is s=4.736. What is the margin of error for a 99% Confidence Interval for the mean? (Go to two decimal places.)
The amount of trash generated by US households (in lbs per day) is Normally distributed. You take a sample of 10 people. The sample average is xbar=10.91 lbs, and the sample standard deviation is s=4.736. What is the margin of error for a 90% Confidence Interval for the mean? (Go to two decimal places.)
In a random sample of ten people, the mean driving distance to work was 23.2 miles and the standard deviation was 7.4 miles. Assume the population is normally distributed and use the t-distribution to find the margin of error and construct a 95% confidence interval for the population mean u. Interpret the results. Identify the margin of error. 5.3 miles (Round to one decimal place as needed.) Construct a 95% confidence interval for the population mean. (Round to one decimal place as needed.)
From a sample of 38graduate students, the mean number of months of work experience prior to entering an MBA program was 34.93. The national standard deviation is known to be 18 months. What is a 95% confidence interval for the population mean? 95% confidence interval for the population mean is _____ , _____. (Use ascending order. Round to two decimal places as needed.)
A sample of 22 public high school students spent an average of 7 hours studying per week. Assuming the distribution of hours spent studying is normally distributed. Find a 95% confidence interval for the mean number of hours spent studying by public high school students.? Assume the standard deviation is 1.3 hours.
In a random sample of twelve people, the mean driving distance to work was 18.8 miles and the standard deviation was 4.9 miles. Assume the population is normally distributed and use the t-distribution to find the margin of error and construct a 90% confidence interval for the population mean μ. Interpret the results.
Use the standard normal distribution or the t-distribution to construct a 90% confidence interval for the population mean. Justify your decision. If neither distribution can be used, explain why. Interpret the results. In a random sample of 40 people, the mean body mass index (BMI) was 26.6 and the standard deviation was 6.13.
The average salary of 64 employee was 5400. Using historical data, we will assume that the population standard deviation is 260. Find the 90% confidence interval for the population mean salary. Select one: O a. 5400 + 53.46 O b. 5400 + 57.58 O c. 5400 + 55.52 O d. 5400 + 51.41
Mrs. Gallas wanted to estimate the average weight of an Oreo cookie to determine if theaverage weight was less than advertised. She selected a random sample of 30 cookies andfound the weight of each cookie (in grams). The mean weight was = 11.1921 grams with astandard deviation of sx = 0.0817 grams. Make a 95% confidence interval to estimate the truemean weight of an Oreo. 1. What is the formula for calculating the standard deviation of the sampling distribution of x? 2.What condition must be met to use this formula? Has it been met?
A random sample of 16 light bulbs has a mean life of 650 hours and a standard deviation of 32 hours. Assume the population has a normal distribution. Construct a 90% confidence interval for the population mean. (Answer in 2 decimal places.) Answer: Blank 1 - Blank 2

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