Executives at a car dealership want to estimate the average age of their customersbefore making a television commercial. They want to be 90% confident that themean age is ±2 years of the sample mean. If the standard deviation from a previousstudy is 12 years, how large should the sample be?98ODD2394139

Answered: Executives at a car dealership want to…

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 quantitative data set has size 50. At least how many observations lie within three standard deviations to either side of the mean?
solve asap within 15 mins or else downvote
An engineer wishes to determine the width of a particular Electronic Component. If she knows that the standard deviation is 3.8 mm how many of these components should she consider to be 90% sure that mean will be 0.2 mm
we want to obtain a sample to estimate a population mean. Based on previous evidence, researchers believe the population standard deviation is approximately 38.7. We would like to be 99% confident that the estimate is within 4 of the true population mean. How large of a sample size is required ?
Are Older men Shorter than younger men? According to a national mean report the theight arus men IS 69.4 Inches. In a sample Between ages 60 and 300 men 69 The mean theight was I 68.7 Inches. Public Health Officials Want to determine whether the mean theight 14 108 For alder men is less than the mean Height All adult men of population standard deviation is Use a=0.65 level of 3.42 Signifigance, and the pratue
A quantitative data set has a size 50. At least how many observations lie within 3standard deviations to either side of the mean?
Find the variance and the standard deviation for the following numbers: 1, 5, 6, 8. Show all your work. Do not simplify fractions/products/similar.
A particular fruit's weights are normally distributed, with a mean of 323 grams and a standard deviation of 7 grams.The heaviest 18% of fruits weigh more than how many grams?Give your answer to the nearest gram.
In order to set rates, an insurance company is trying to estimate the number of sick days that full time workers at an auto repair shop take per year. A previous study indicated that the standard deviation was 3.3 days. How large a sample must be selected if the company wants to be 99% confident that the true mean differs from the sample mean by no more than 1 day? 73 157 90 52
A health care professional wishes to estimate the birth weights of infants. How large a sample must be selected if she desires to be 95% confident that the true mean is within 10 ounces of the sample mean? The standard deviation of the birth weights is known to be 4 ounces.
Consider the data from the Anthropology 105 class. The mean for women is 64.33 in and the standard deviation is 2.64 in. The average height of men in the US is approximately 5ft 10in. What proportion of women represented here are shorter than the average man?
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