QUESTION 27Ahmad is interested in estimating the mean waiting time at a fast foodoutlet. He selected a random sample of 49 customers which yielded amean of 2.6 minutes and a standard deviation of 0.7 minutes. Whichdistribution should be used to construct the confidence interval?Ot distribution with 49 degrees of freedom.Ot distribution with 48 degrees of freedom.Neither t nor standard normal distribution.Standard normal distribution.

Sample size: customers,Sample mean: minutes, andSample standard deviation: minutes.

Answered: Ahmad is interested in estimating 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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The number of chocolate chips in a popular brand of cookie is normally distributed with a mean of 19 chocolate chips per cookie and a standard deviation of 3.5 chips. When the cookies come out of the oven, only the middle 90% in terms of the number of chocolate chips are acceptable (the rest are considered defective). What are the cutoff numbers for the number of chocolate chips in acceptable cookies? (Give your answers to three decimal places)______ and _______
Glucose levels in patients free of diabetes are assumed to follow a normal distribution with a mean of 120 and a standard deviation of 16. What proportion of patients have glucose levels exceeding 115? Answer: If a patient has a glucose level of 140, what percentile is this? Answer: What is the probability that the mean glucose level exceeds 115 in a sample of 12 patients?
Assum a sample is used to estimate a populatation mean. Find the 95% confidence interval for a sample size of 41 with a mean of 64.2 and a standard deviation of 13.4. Enter answer as an open interval (i.e. parentheses) accurate to 3 decimal places.
Independent random samples selected from two normal populations produced the following sample means and standard deviations. Sample 1 Sample 2 n1 = 14 n2 = 11 1 = 7.1 2 = 8.4 s1 = 2.3 s2 = 2.9 Find and interpret the 95% confidence interval for Write separately the pooled standard deviation, -critical value.
Fuel economy estimates for automobiles built in a certain year predicted a mean of 28.8 mpg and a standard deviation of 5.2 mpg for highway driving. Assume that a normal distribution can be applied. Within what range are 99.7% of the automobiles? The range for 99.7% of the automobiles is to mpg.
Times for a surgical procedure are normally distributed. There are two methods. Method A has a mean of 31 minutes and a standard deviation of 4 minutes, while method B has a mean of 35 minutes and a standard deviation of 2.0 minutes. (a) Which procedure is preferred if the procedure must be completed within 33 minutes? multiple choice 1 Method A Method B Either Method (b) Which procedure is preferred if the procedure must be completed within 41.0 minutes? multiple choice 2 Method A Method B Either Method
Cell Phone Lifetimes A recent study of the lifetimes of cell phones found the average is 23.8 months. The standard deviation is 5.8 months. If a company provides its 33 employees with a cell phone, find the probability that the mean lifetime of these phones will be less than 23.8 months. Assume cell phone life is a normally distributed variable, the sample is taken from a large population, and the correction factor can be ignored. Use a TI-83 Plus/TI-84 Plus calculator. Round your answer to at least four decimal places. <PX23.8)=

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