ness Statistics 1 || Spring21Time left 1:26:29Suppose that the walting times for patients at a local hospital are normally distributed with a known population standard deviation of30 minutes. A random sample of 75 patients in the local hospital had a mean time of 90 minutes. Assume a 95% confidence interval forthe population mean a. The width of the 95% confidence interval estimate isOa 11.38Ob. 13.58Oc 16.12Od. 17.86PAGENEXT PAGEMAYétv23

Confidence interval: It is defined as the range which contains the value of true population…

Answered: Suppose that the walting times for…

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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The average salary of 64 employee was 5400. Using historical data, we will assume that the population standard deviation is 280. Find the 95% confidence interval for the population mean salary. Select one: O a. 5400 ± 61.25 O b. 5400 + 68.60 O c. 5400 + 63.70 O d. 5400 + 66.15
A ecologist wishes to estimate the mean lifespan for a specific species of bird. Assume that bird lifespan is normally distributed and that each bird's lifespan is independent of all others. The researcher analyzes a random sample of n=7 deceased birds to find out how long they lived for. It is found that the mean lifespan in the sample is y= 5 4 years with standard deviation s=13 years. Choose the correct formula for a 95% confidence interval for the true mean lifespan. X± to.975,n O xt to.975,n-1 n-1 O none of these X+ Z0.975 O x+ to.975,n-1' O xt to.975,n-15

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