The Graduate Record Exams (GRE) quantitative section has a population mean of 152.6 and population standard deviation of 8.8.random sample of 48 individualsMean GRE quantitative section of the sample to be 155.Assume we are conducting a two-tailed hypothesis test at an alpha = .05 level.Write the null hypothesis in symbols and words. Write the alternative hypothesis in symbols and wordsHow do you calculate the test statistic. How do you compute the p-value using softwareMake a decision about the null using the critical value approach. Make a decision about the null using the p-value approach

Population mean : µ = 152.6 Population standard deviation : σ = 8.8 Random sample (n = 48) Two…

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MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

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The Graduate Record Exams (GRE) quantitative section has a population mean of 152.6 and population standard deviation of 8.8.

random sample of 48 individuals

Mean GRE quantitative section of the sample to be 155.

Assume we are conducting a two-tailed hypothesis test at an alpha = .05 level.

1. Write the null hypothesis in symbols and words. Write the alternative hypothesis in symbols and words
2. How do you calculate the test statistic. How do you compute the p-value using software
3. Make a decision about the null using the critical value approach. Make a decision about the null using the p-value approach

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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We used a one-tailed test instead of a two-tailed test.
1. Rewrite the alternative hypothesis (in words and symbols) to reflect a one-tailed test
2. What would the p-value be? What decision would you make?
3. Does this agree with the decision from the two-tailed test?

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