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Description: A recent study focused on the number of times men and women send twitter messages in a day. The information is summarized next. At the .01 significance level, conclude on whether there is a difference in the mean number of times men and women send a

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 recent study focused on the number of times men and women send twitter messages in a day. The information is summarized next. At the .01 significance level, conclude on whether there is a difference in the mean number of times men and women send a Twitter message in a day.

Sample size sample mean population standard deviation

Men 25 23 5

women 30 28 10

1）Develop the null and alternative hypotheses for this study?

2）Determine a test statistic and the critical value(s).

3) Calculate the value of the test statistic for this hypothesis testing.

4）What is the p-value for this hypothesis test?

5）Based on the p-value, what is your conclusion?

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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