Answered: For a population with a mean of μ= 50…

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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For a population with a mean of μ= 50 and a standard deviation of σ= 10, compute the standard error of the mean for each of he following:

n = 16 Answer:

n = 25 Answer:

For a population with a mean of μ= 50 and a standard deviation of σ= 10, compute the z-score using the previous question's standard error of the mean.

n = 16 Answer:

n = 25 Answer:

For a population with a mean of μ= 40 and a standard deviation of σ= 6, find the z-score corresponding to each of the following samples:

a. M = 43 for a sample of n =4

b. M = 43 for a sample of n = 16

A sample of n = 4 scores has a mean of M = 75. Find the z-score for this sample:

a. If it was obtained from a population with μ = 80 and σ = 10.

b. If it was obtained from a population with μ= 80 and σ= 20

The population of IQ scores forms a normal distribution with a mean of μ= 100 and a standard deviation of σ= 15. What is the probability of obtaining a sample mean greater than M = 95,

a. for a random sample of n = 9 people?

b. for a random sample of n = 25 people?

A normal distribution has a mean of μ= 54 and a standard deviation of σ=6 What is the probability of randomly selecting a score more than 51?

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

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