Answered: An IT consultancy in Singapore that…

Name: An IT consultancy in Singapore that offers telephony solutions to smal
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Description: An IT consultancy in Singapore that offers telephony solutions to small businesses claims that its new call handling software will enable clients to increase suc cessful inbound calls by an average of 75 calls per week. For a random sample of 25 smal

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.3: Measures Of Spread

Problem 1GP

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An IT consultancy in Singapore that offers telephony solutions to small businesses claims that its new call handling software will enable clients to increase suc cessful inbound calls by an average of 75 calls per week. For a random sample of 25 small-business users of this software, the average increase in successful inbound calls was 70.2 and the sample standard deviation was 8.4 calls. Test, at the 5% level, the null hypothesis that the population mean increase is at least 75 calls. Assume a normal distribution.

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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