Pew Research surveyed respondents by telephone, drawing a random sample of landlines and another random sample of cell phones. For those numbers that were valid, they report the following: Land Cell Total No 552 42 594 Answer/Busy Voicemail 3347 2843 6190 Contact 8399 8612 17,011 Total 12,298 11,497 23,795 Are the results they find independent of the telephone type? a) Under the usual null hypothesis, what are the expected values? b) Compute the x2 chi squared statistic. c) How many degrees of freedom does it have? d) What do you conclude?

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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Pew Research surveyed respondents by telephone, drawing a
random sample of landlines and another random sample of cell
phones. For those numbers that were valid, they report the
following:
Land
Cell
Total
No
552
42
594
Answer/Busy
Voicemail
3347
2843
6190
Contact
8399
8612
17,011
Total
12,298
11,497
23,795
Are the results they find independent of the telephone type?
a) Under the usual null hypothesis, what are the expected values?
b) Compute the x2 chi squared statistic.
c) How many degrees of freedom does it have?
d) What do you conclude?
Transcribed Image Text:Pew Research surveyed respondents by telephone, drawing a random sample of landlines and another random sample of cell phones. For those numbers that were valid, they report the following: Land Cell Total No 552 42 594 Answer/Busy Voicemail 3347 2843 6190 Contact 8399 8612 17,011 Total 12,298 11,497 23,795 Are the results they find independent of the telephone type? a) Under the usual null hypothesis, what are the expected values? b) Compute the x2 chi squared statistic. c) How many degrees of freedom does it have? d) What do you conclude?
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