Answered: A school administrator wants to see if…

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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Question

A school administrator wants to see if there is a difference in the number of students per class for Portland Public School district (group 1) compared to the Salem School district (group 2). A random sample of 27 Portland classes found a mean of 36 students per class with a standard deviation of 4. A random sample of 26 Salem classes found a mean of 38 students per class with a standard deviation of 2.

Assume all conditions are met for inference. Round answers to at least one decimal place.

Find a 99% confidence interval in the difference of the means.

(,) round to 1 decimal places

Interpret the confidence interval in context: round all values to 1 decimal place

We are % that the difference in class size between Portland and Salem is between and .

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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