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Telephone Calls A researcher knew that before cell phones, a person made on average 2.8 calls per day. He believes that the number of calls made per day today is higher. He selects a random sample of 33 individuals who use a cell phone and asks them to keep track of the number of calls that they made on a certain day. The mean was 3.1. At a=0.10, is there enough evidence to support the researcher's claim? The standard deviation for the population found by a previous study is 0.9. Assume that the variable is normally distributed. Use the critical value method with tables.

Telephone Calls A researcher knew that before cell phones, a person made on average 2.8 calls per day. He believes that the number of calls made per day today is higher. He selects a random sample of 33 individuals who use a cell phone and asks them to keep track of the number of calls that they made on a certain day. The mean was 3.1. At a=0.10, is there enough evidence to support the researcher's claim? The standard deviation for the population found by a previous study is 0.9. Assume that the variable is normally distributed. Use the critical value method with tables.

MATLAB: An Introduction with Applications
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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critical value p vaule and z value
Telephone Calls A researcher knew that before cell phones, a person made on average 2.8 calls per day. He believes that the number of calls made per day today is higher. He selects a random sample of 33 individuals who use a cell phone and asks them to keep track of the number of calls that they made on a certain day. The mean was 3.1. At a=0.10, is there enough evidence to support the researcher's claim? The standard deviation for the population found by a previous study is 0.9. Assume that the variable is normally distributed. Use the critical value method with tables.
Transcribed Image Text:Telephone Calls A researcher knew that before cell phones, a person made on average 2.8 calls per day. He believes that the number of calls made per day today is higher. He selects a random sample of 33 individuals who use a cell phone and asks them to keep track of the number of calls that they made on a certain day. The mean was 3.1. At a=0.10, is there enough evidence to support the researcher's claim? The standard deviation for the population found by a previous study is 0.9. Assume that the variable is normally distributed. Use the critical value method with tables.
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