Answered: The time married men with children…

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

The time married men with children spend on child care averages 6.9 hours per week. You belong to a professional group on family practices that would like to do its own study to determine whether the time married men in your area spend on child care per week differs from the reported mean of 6.9 hours per week. A sample of 40 married couples will be used with the data collected showing the hours per week the husband spends on child care. The sample data are contained in the table below.

7.6	2.4	8.9	7.9
6.1	3.5	4.6	10.2
3.6	6.3	9.8	0.4
8.3	10.2	8.7	6.1
12.4	9.8	9.4	0.4
7.2	7.5	5.6	8.9
8.6	10.4	12.3	5.6
8.5	8.1	6.6	8.3
8.1	4.7	5.2	10.5
7.9	7.2	7.2	8.2

b. What is the sample mean (to 2 decimals)?

Calculate the value of the test statistic (to 2 decimals).

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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