Answered: It is believed that the waiting time…

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 3
It is believed that the waiting time for a service has a population mean value of µ =13
minutes. One wants to test whether the population mean is 13 minutes. The waiting time of a sample of 60 services is collected. The significance level alpha is set at 5%. The Excel data analysis results are presented in table 2.
1) Give appropriate null and alternative hypotheses.
Null hypothesis H 0 .
Alternative hypothesis H 1
2) Find the p value for this test.
3) What decision should be made about the hypotheses? Give evidence for your choice.
Table 2: One sample t-test results

Variable
Mean 14.72
Variance 34.38
Observations 60.00
Hypothesized Mean 0.00

Difference
Df 59.00
t Stat 2.27
P(T<=t) one-tail 0.02
t Critical one-tail 1.67
P(T<=t) two-tail 0.04
t Critical two-tail 2.00

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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