Currently patrons at the library speak at an average of 70 decibels. Will this average change after the installation of a new computer plug in station? After the plug in station was built, the librarian randomly recorded 46 people speaking at the library. Their average decibel level was 64.6 and their standard deviation was 11. What can be concluded at the the αα = 0.10 level of significance? For this study, we should use Select an answer z-test for a population proportion t-test for a population mean The null and alternative hypotheses would be: H0:H0: ? p μ Select an answer = > < ≠ H1:H1: ? p μ Select an answer < > ≠ = The test statistic ? z t = (please show your answer to 3 decimal places.) The p-value = (Please show your answer to 4 decimal places.) The p-value is ? > ≤ αα Based on this, we should Select an answer reject accept fail to reject the null hypothesis. Thus, the final conclusion is that ... The data suggest the populaton mean has significantly changed from 70 at αα = 0.10, so there is statistically significant evidence to conclude that the population mean decibel level at the library has changed since the plug in station was built. The data suggest the population mean has not significantly changed from 70 at αα = 0.10, so there is statistically significant evidence to conclude that the population mean decibel level at the library has not changed since the plug in station was built. The data suggest that the population mean decibal level has not significantly changed from 70 at αα = 0.10, so there is statistically insignificant evidence to conclude that the population meandecibel level at the library has changed since the plug in station was built.

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Description: Currently patrons at the library speak at an average of 70 decibels. Will this average change after the installation of a new computer plug in station? After the plug in station was built, the librarian randomly recorded 46 people speaking at the lib

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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Currently patrons at the library speak at an average of 70 decibels. Will this average change after the installation of a new computer plug in station? After the plug in station was built, the librarian randomly recorded 46 people speaking at the library. Their average decibel level was 64.6 and their standard deviation was 11. What can be concluded at the the αα = 0.10 level of significance?

For this study, we should use Select an answer z-test for a population proportion t-test for a population mean
The null and alternative hypotheses would be:

H0:H0: ? p μ Select an answer = > < ≠

H1:H1: ? p μ Select an answer < > ≠ =

The test statistic ? z t = (please show your answer to 3 decimal places.)
The p-value = (Please show your answer to 4 decimal places.)
The p-value is ? > ≤ αα
Based on this, we should Select an answer reject accept fail to reject the null hypothesis.
Thus, the final conclusion is that ...
- The data suggest the populaton mean has significantly changed from 70 at αα = 0.10, so there is statistically significant evidence to conclude that the population mean decibel level at the library has changed since the plug in station was built.
- The data suggest the population mean has not significantly changed from 70 at αα = 0.10, so there is statistically significant evidence to conclude that the population mean decibel level at the library has not changed since the plug in station was built.
- The data suggest that the population mean decibal level has not significantly changed from 70 at αα = 0.10, so there is statistically insignificant evidence to conclude that the population meandecibel level at the library has changed since the plug in station was built.

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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