A parenting magazine reports that the average amount of wireless data used by teenagers each month is 11Gb. For her science fair project, Ella sets out to prove the magazine wrong. She claims that the mean among teenagers in her area is less than reported. Ella collects information from a simple random sample of 4 teenagers at her high school, and calculates a mean of 9.2Gb per month with a standard deviation of 1.4Gb per month. Assume that the population distribution is approximately normal. Test Ella’s claim at the 0.10 level of significance. Step 3 of 3 : Draw a conclusion and interpret the decision. Answer Tables Keypad Keyboard Shortcuts We reject the null hypothesis and conclude that there is sufficient evidence at a 0.10 level of significance that the average amount of wireless data used by teenagers each month is less than 11Gb. We fail to reject the null hypothesis and conclude that there is sufficient evidence at a 0.10 level of significance that the average amount of wireless data used by teenagers each month is less than 11Gb. We reject the null hypothesis and conclude that there is insufficient evidence at a 0.10 level of significance that the average amount of wireless data used by teenagers each month is less than 11Gb. We fail to reject the null hypothesis and conclude that there is insufficient evidence at a 0.10 level of significance that the average amount of wireless data used by teenagers each month is less than 11Gb.

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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We reject the null hypothesis and conclude that there is sufficient evidence at a 0.10 level of significance that the average amount of wireless data used by teenagers each month is less than 11Gb.

We fail to reject the null hypothesis and conclude that there is sufficient evidence at a 0.10 level of significance that the average amount of wireless data used by teenagers each month is less than 11Gb.

We reject the null hypothesis and conclude that there is insufficient evidence at a 0.10 level of significance that the average amount of wireless data used by teenagers each month is less than 11Gb.

We fail to reject the null hypothesis and conclude that there is insufficient evidence at a 0.10 level of significance that the average amount of wireless data used by teenagers each month is less than 11Gb.

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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