In a July 23, 2009, Harris Interactive Poll, 1015 advertisers were asked about their opinions of Twitter. The percentage distribution of their responses is shown in the following table. Opinion A: Twitter is something that is just at its infancy, and its use will grow exponentially over the next few years B: Twitter is something that mostly young people and the media will use, but it will not move more into the mainstream C: Twitter is already over, and it is time to find the next best thing D: I do not know enough about Twitter to have an opinion Opinion A: Twitter is something that is just at its infancy, and its use will grow exponentially over the next few years Percentage 45 B: Twitter is something that mostly young people and the media will use, but it will not move more into the mainstream C: Twitter is already over, and it is time to find the next best thing D: I do not know enough about Twitter to have an opinion 21 Assume that these percentages hold true for the 2009 population of advertisers. Recently 800 randomly selected advertisers were asked the same question. The following table lists the num- ber of advertisers in this sample who gave each response. 17 17 Frequency 374 183 127 116 Test at the 2.5% level of significance whether the current distribution of opinions is different from that for 2009.
In a July 23, 2009, Harris Interactive Poll, 1015 advertisers were asked about their opinions of Twitter. The percentage distribution of their responses is shown in the following table. Opinion A: Twitter is something that is just at its infancy, and its use will grow exponentially over the next few years B: Twitter is something that mostly young people and the media will use, but it will not move more into the mainstream C: Twitter is already over, and it is time to find the next best thing D: I do not know enough about Twitter to have an opinion Opinion A: Twitter is something that is just at its infancy, and its use will grow exponentially over the next few years Percentage 45 B: Twitter is something that mostly young people and the media will use, but it will not move more into the mainstream C: Twitter is already over, and it is time to find the next best thing D: I do not know enough about Twitter to have an opinion 21 Assume that these percentages hold true for the 2009 population of advertisers. Recently 800 randomly selected advertisers were asked the same question. The following table lists the num- ber of advertisers in this sample who gave each response. 17 17 Frequency 374 183 127 116 Test at the 2.5% level of significance whether the current distribution of opinions is different from that for 2009.
Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter12: Probability
Section12.3: Conditional Probability; Independent Events; Bayes' Theorem
Problem 82E
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Transcribed Image Text:In a July 23, 2009, Harris Interactive Poll, 1015 advertisers were asked about their opinions
of Twitter. The percentage distribution of their responses is shown in the following table.
Opinion
A: Twitter is something that is just at its infancy, and its use will grow exponentially
over the next few years
B: Twitter is something that mostly young people and the media will use, but it will
not move more into the mainstream
C: Twitter is already over, and it is time to find the next best thing
D: I do not know enough about Twitter to have an opinion
Opinion
A: Twitter is something that is just at its infancy, and its use will grow
exponentially over the next few years
B: Twitter is something that mostly young people and the media will use,
but it will not move more into the mainstream
Percentage
45
Assume that these percentages hold true for the 2009 population of advertisers. Recently 800
randomly selected advertisers were asked the same question. The following table lists the num-
ber of advertisers in this sample who gave each response.
C: Twitter is already over, and it is time to find the next best thing
D: I do not know enough about Twitter to have an opinion
21
17
17
Frequency
374
183
127
116
Test at the 2.5% level of significance whether the current distribution of opinions is different
from that for 2009.
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