A labour economist aims to estimate the variance of unemployed workers'mathematic test scores. Assume that a random sample of 18 scores had a samplestandard deviation of 10.4.Using the information above, form a 90% confidence interval for the populationvariance.O a) The confidence interval is exactly between 86.64 and 222.07Ob) The confidence interval is exactly between 46.64 and 202.07O c) The confidence interval is exactly between 66.64 and 212.07() d) None of the answers are correct

Answered: Image /qna-images/answer/d4ff57eb-233d-4d5d-8971-1a1d08d316a4.jpg

Answered: A labour economist aims to estimate the…

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 fitness center is interested in finding a 95% confidence interval for the mean number of days per week that Americans who are members of a fitness club go to their fitness center. Records of 219 members were looked at and their mean number of visits per week was 3.5 and the standard deviation was 1.6. Round answers to 3 decimal places where possible. With 95% confidence the population mean number of visits per week is between ___ and ___visits. If many groups of 219 randomly selected members are studied, then a different confidence interval would be produced from each group. About ___percent of these confidence intervals will contain the true population mean number of visits per week and about ____ percent will not contain the true population mean number of visits per week.
Answer A B C
The distribution of study times for first-year students follow a Normal distribution with a standard deviation σ = 48 minutes. Suppose a sample of 344 students found that the mean study time for these students was x¯= 170 minutes per week. Use this to find a 94.38% confidence interval to estimate the mean study time for all students. We are 94.38% confident that the mean study time for first-year students is between the following ( answer) minutes and ( answer) minutes. The answer needs to be the mean study time for first-year students is between what amount of minutes and the following minutes.
The standard deviation, S, for the annual medical cost of 24 households was found to equal $1689 find a 95% confidence interval for the standard deviation of the annual medical cost for all households. Assume medical costs are normally distributed.
A random sample of 21 lunch orders at Noodles & Company showed a mean bill of $13.54 with a standard deviation of $6.45. Find the 98 percent confidence interval for the mean bill of all lunch orders. (Round your answers to 4 decimal places.) The 98% confidence interval is from _____to______
The manager at a large fitness centre keeps track of amount of time it takes a sample of 65 clients to run a mile she finds the mean time to run a mile in this sample is 10.4 minutes with standard deviation of 2.1 minutes. Assume that the sample is random sample that is normally distributed. a. Construct a 68, 95, 99 confidence interval for the parameter of interest in this problem.
Assume that a sample is used to estimate a population mean. Find the 90% confidence interval for a smaple of size 46 with a mean of 68.5 and a standard deviation of 6.6. Enter the answer as an open-interval (parentheses) accurate to one decimal place (because the sample statistics are reported accurate to one decimal place).
Assume that a sample is used to estimate the life expectancy for males in a certain county. Find the 80% confidence interval for a sample of size 65 with a mean of 81.4 years and a standard deviation of 15.6 years. Enter your answer as an open-interval (i.e., parentheses) accurate to one decimal place (because the sample statistics are reported accurate to one decimal place).80% C.I. =
According to a study, brain weights of men in country A are normally distributed with mean 1.49 kg and standard deviation 0.14 kg. Apply the empirical rule to complete each sentence. Complete parts (a) through (d). a. Complete the sentence "Approximately 68% of the men have brain weights between _____ kg and _____ kg." Approximately 68% of the men have brain weights between nothing kg and nothing kg.
A random sample of 21 lunch orders at Noodles & Company showed a mean bill of $13.54 with a standard deviation of $6.45. Find the 98 percent confidence interval for the mean bill of all lunch orders. (Round your answers to 4 decimal places.) The 98% confidence interval is from ___to___
The mayor is interested in finding a 90% confidence interval for the mean number of pounds of trash per person per week that is generated in the city. The study included 185 residents whose mean number of pounds of trash generated per person per week was 34.3 pounds and the standard deviation was 6.4 pounds. Round answers to 3 decimal places where possible. a. With 90% confidence the population mean number of pounds per person per week is between and pounds. b. If many groups of 185 randomly selected members are studied, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population mean number of pounds of trash generated per person per week and about percent will not contain the true population mean number of pounds of trash generated per person per week.

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