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To determine a target audience for a new email package, a computer company surveyed a large sample of potential customers, asking each whether he or she uses email on a regular basis. (The company considered "a regular basis" to be at least three times a week.) The customers were classified according to two variables: age ("Under 18", "18-35", "36-54", or "55+") and email use ("On a regular basis" or "Not on a regular basis"). The respective observed frequencies are written in the cells of the contingency table below. In addition, three of the cells have blanks beneath the observed frequencies. Fill in these blanks with the frequencies expected if the two variables, email use and age, are independent. Round your answers to two or more decimal places. Send data to Excel Age (in years) ? Under 18 18-35 36-54 55+ Total On a 130 135 31 120 regular 416 basis Not on a 161 168 65 190 Email use regular 584 basis Total 291 303 96 310 1000

To determine a target audience for a new email package, a computer company surveyed a large sample of potential customers, asking each whether he or she uses email on a regular basis. (The company considered "a regular basis" to be at least three times a week.) The customers were classified according to two variables: age ("Under 18", "18-35", "36-54", or "55+") and email use ("On a regular basis" or "Not on a regular basis"). The respective observed frequencies are written in the cells of the contingency table below. In addition, three of the cells have blanks beneath the observed frequencies. Fill in these blanks with the frequencies expected if the two variables, email use and age, are independent. Round your answers to two or more decimal places. Send data to Excel Age (in years) ? Under 18 18-35 36-54 55+ Total On a 130 135 31 120 regular 416 basis Not on a 161 168 65 190 Email use regular 584 basis Total 291 303 96 310 1000

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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To determine a target audience for a new email package, a computer company surveyed a large sample of potential customers, asking each whether he or she uses email on a regular basis. (The company considered "a regular basis" to be at least three times a week.) The customers were classified according to two variables: age ("Under 18", "18-35", "36-54", or "55+") and email use ("On a regular basis" or "Not on a regular basis"). The respective observed frequencies are written in the cells of the contingency table below. In addition, three of the cells have blanks beneath the observed frequencies. Fill in these blanks with the frequencies expected if the two variables, email use and age, are independent. Round your answers to two or more decimal places. Contingency Table: | Email Use | Age (in years) | | | | | | |-----------------------|----------------|----------------|---------|-------|------|--------| | | Under 18 | 18-35 | 36-54 | 55+ | Total| | On a regular basis | 130 | 135 | 31 | 120 | 416 | | Not on a regular basis| 161 | 168 | 65 | 190 | 584 | | Total | 291 | 303 | 96 | 310 | 1000 | Please refer to the contingency table to calculate expected frequencies if needed.
Transcribed Image Text:To determine a target audience for a new email package, a computer company surveyed a large sample of potential customers, asking each whether he or she uses email on a regular basis. (The company considered "a regular basis" to be at least three times a week.) The customers were classified according to two variables: age ("Under 18", "18-35", "36-54", or "55+") and email use ("On a regular basis" or "Not on a regular basis"). The respective observed frequencies are written in the cells of the contingency table below. In addition, three of the cells have blanks beneath the observed frequencies. Fill in these blanks with the frequencies expected if the two variables, email use and age, are independent. Round your answers to two or more decimal places. Contingency Table: | Email Use | Age (in years) | | | | | | |-----------------------|----------------|----------------|---------|-------|------|--------| | | Under 18 | 18-35 | 36-54 | 55+ | Total| | On a regular basis | 130 | 135 | 31 | 120 | 416 | | Not on a regular basis| 161 | 168 | 65 | 190 | 584 | | Total | 291 | 303 | 96 | 310 | 1000 | Please refer to the contingency table to calculate expected frequencies if needed.
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