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Name: A group of students estimated the length of one minute without referen
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Description: A group of students estimated the length of one minute without reference to a watch or clock, and the times (seconds) are listed below. Use a 0.05 significance level to test the claim that these times are from a population with a mean equal to 60 sec

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 group of students estimated the length of one minute without reference to a watch or clock, and the times (seconds) are listed below. Use a 0.05 significance level to test the claim that these times are from a population with a mean equal to 60 seconds. Does it appear that students are reasonably good at estimating one minute?

66, 79, 39, 65, 41, 26, 58, 62, 68, 47, 63 73, 91, 87, 68.

1. Determine the test statistic

2. P-value

3. State the final conclusion that addresses the original claim.

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

Given:-

66,79,39,65,41,26,58,62,68,47,63,73,91,87,68

significance leve $(α) = 0.05$

population mean = 60

we have to calculate the test statistic , P-value , State the final conclusion that addresses the original claim.

Step 2

the mean is the sum of all values divided by the number of values

$x = \frac{\sum_{} x_{i}}{n}$

so,

$x = \frac{66 + 79 + 39 + 65 + 41 + 26 + . . . . . . . . . . . . . . . . . . . . + 87 + 68}{15} x = \frac{933}{15} = 62.2 x = 62.2$

the variance is the sum of squared deviation from the mean divided by ( n-1 ) . The standard deviation is the square root of the variance

$s = \sqrt{\frac{{(66 - 62.2)}^{2} + {(79 - 62.2)}^{2} + {(39 - 62.2)}^{2} + . . . . . . . . . . . . . . . . . . . + {(68 - 62.2)}^{2}}{15 - 1}}$

$s = \sqrt{\frac{4480.4}{14}} = \sqrt{320.028} s = 17.8893$

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