Monica believes that the number of email accounts a person has depends on what area of the country they are from. They divide the country into 6 pieces. They then survey 45 people from Eastern, 43 people from Western US, 40 people from Central US, 35 people from Alaska, 39 people from Hawaii, and 47 people from the Territories. The value of the pooled standard deviation for each group is estimated as 2.7, and the overall average number of accounts is 14.21.

Monica believes that the number of email accounts a person has depends on what area of the country they are from. They divide the country into 6 pieces. They then survey 45 people from Eastern, 43 people from Western US, 40 people from Central US, 35 people from Alaska, 39 people from Hawaii, and 47 people from the Territories. The value of the pooled standard deviation for each group is estimated as 2.7, and the overall average number of accounts is 14.21.

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

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.4: Distributions Of Data

Problem 19PFA

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Question

Monica believes that the number of email accounts a person has depends on what area of the country they are from. They divide the country into 6 pieces. They then survey 45 people from Eastern, 43 people from Western US, 40 people from Central US, 35 people from Alaska, 39 people from Hawaii, and 47 people from the Territories.

The value of the pooled standard deviation for each group is estimated as 2.7, and the overall average number of accounts is 14.21.

They calculated the following: