Answered: For a population with a standard…

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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it is known that the population standard deviation of weight among females is 30. assuming that we have a random sample of 210, what is the standard error of the average weight among women of a sample of this size?
An IQ test is designed so that the mean is 100 and the standard deviation is 10 for the population of normal adults. Find the sample size necessary to estimate the mean IQ score of statistics students such that it can be said with 99% confidence that the sample mean is within 8 IQ points of the true mean. Assume that σ=10 and determine the required sample size.
How large a sample must be taken to be 99% confident that the estimate of the average time of long-distance calls is within 5 minutes of the true average time of long-distance calls of all customers? A previous study indicated that the standard deviation for long-distance calls is 30 minutes.
Use the formula to find the standard error of the distribution of differences in sample means, x⎯⎯1−x⎯⎯2x¯1-x¯2.Samples of size 40 from Population 1 with mean 3.7 and standard deviation 1.9 and samples of size 40 from Population 2 with mean 1.9 and standard deviation 1.2Round your answer for the standard error to two decimal places.standard error = Enter your answer in accordance to the question statement
A sample of n = 5 scores has a standard deviation of s = 5. What is the value of SS, the sum of the squared deviations for this sample?
A sample of n=36 scores has a standard error of 3. What is the standard deviation of the population from which the sample is obtained?
A particular fruit's weights are normally distributed, with a mean of 453 grams and a standard deviation of 28 grams. If you pick 10 fruits at random, then 12% of the time, their mean weight will be greater than how many grams?
In order to have the standard error of the mean be 6, one would need to take a sample of size from a normally distributed population with a standard deviation of 42
The percent of fat calories that a person in a city consumes daily is normally distributed with a mean of about 36 and a standard deviation of 10. Suppose that 16 individuals are randomly chosen. Find the probability that the average percent of fat calories consumed in this group of 16 is less than 40.
A random sample of sizen=20 has the mean 20 and standard deviation 5. What is the standard error of the mean ?
How large a sample must be taken to be 99% confident that the estimate of the average time of long-distance calls is within 3 minutes of the true average time of long-distance calls of all customers? A previous study indicated that the standard deviation for long-distance calls is 20 minutes.
a sample of n=16 scores is selected from a population with a mean of 60 and a standard deviation of 24. If the sample mean is M=66, what is the z-score for this sample mean?

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For a population with a standard deviation of 40, how large a sample is necessary to have a standard error that is at most 5 points?