A sample of n=9 individuals is selected from a population with a mean of μ=10. A researcher suspects that after the individuals have gone through a specific type of treatment, their performances on a standardized examination will be different from the general population. After the treatment, the sample has a M=13 and s2=9.

The Null and alternative hypotheses are as follows: H0: μ = 10. H1: μ ≠ 10. Since sample size is…

Answered: A sample of n=9 individuals is selected…

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 sample of n=9 individuals is selected from a population with a mean of μ=10. A researcher suspects that after the individuals have gone through a specific type of treatment, their performances on a standardized examination will be different from the general population. After the treatment, the sample has a M=13 and s²=9.

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 + ...

Expert Solution

Step 1

The Null and alternative hypotheses are as follows:

H₀: μ = 10.

H₁: μ ≠ 10.

Since sample size is small and population standard deviation is unknown, t-test is appropriate in this situation.

Test statistic:

Here, the sample mean, x-bar is 13.

Population mean, µ is 10.

Sample standard deviation, s = 3

Sample size, n is 9.

The test statistic for hypothesis test for mean is given by:

t =(x-bar –μ)/(s/√n)

= (13-10)/(3/√9)

= 3

The test statistic is 3.

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