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Name: Community college instructors' salaries in one state are very low, so
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Description: Community college instructors' salaries in one state are very low, so low that educators in that state regularly complain about their compensation. The national mean is $51,809, but instructors from Mississippi claim that the mean in their state is s

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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Community college instructors' salaries in one state are very low, so low that educators in that state regularly complain about their compensation. The national mean is $51,809, but instructors from Mississippi claim that the mean in their state is significantly lower. They survey a simple random sample of 33 colleges in the state and calculate a mean salary of $45,068 with a standard deviation of $15,261. Test the instructors' claim at the 0.05 level of significance.

step 1 of 3: state the null and alternative hypotheses for the test. Fill in the blank below. H0: μ= 51,809

Ha: μ _____ 51,809

Step 2 of 3: compute the value of the test statistic. Round your answer to three decimal points.

Step 3 of 3: draw a conclusion and interpret the decision

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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