According to a Pew Research Center study, in May 2011, 30% of all American adults had a smart phone (one which the user can use to read email and surf the Internet). A communications professor at a university believes this percentage is higher among community college students. She selects 441 community college students at random and finds that 140 of them have a smart phone. Then in testing the hypotheses:
H0: p = 0.3 versus
Ha: p > 0.3,
what is the test statistic?
z = . (Please round your answer to two decimal places.)
This is the right tailed test .
The null and alternative hypothesis is
H0 : p =0.30
Ha : p >0.30
= x / n = 140/441=0.32
P0 = 0.30
1 - P0 = 0.70
Test statistic = z
=
- P0 / [
P0
* (1 - P0 ) / n]
= 0.32-0.30/ [(0.30*0.70)
/ 441]
= 0.92
According to a Pew Research Center study, in May 2011, 30% of all American adults had...
According to a Pew Research Center study, in May 2011, 30% of all American adults had a smart phone (one which the user can use to read email and surf the Internet). A communications professor at a university believes this percentage is higher among community college students. She selects 280 community college students at random and finds that 90 of them have a smart phone. Then in testing the hypotheses: H0: p = 0.3 versus Ha: p > 0.3, what...
According to a Pew Research Center study, in May 2011, 30% of all American adults had a smart phone (one which the user can use to read email and surf the Internet). A communications professor at a university believes this percentage is higher among community college students. She selects 422 community college students at random and finds that 140 of them have a smart phone. Then in testing the hypotheses: H 0 : p = 0.3 versus H a :...
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According to a Pew Research Center study, in May 2011, 37% of all American adults had a smart phone (one which the user can use to read email and surf the Internet). A communications professor at a university believes this percentage is higher among community college students. She selects 465 community college students at random and finds that 176 of them have a smart phone. Then in testing the hypotheses: H0: p = 0.37 versus Ha: p > 0.37, what...
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According to a Pew Research Center study, in May 2011, 31% of all American adults had a smart phone (one which the user can use to read email and surf the Internet). A communications professor at a university believes this percentage is higher among community college students. She selects 352 community college students at random and finds that 129 of them have a smart phone. In testing the hypotheses: H0: p = 0.31 versus Ha: p > 0.31, she calculates...
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According to a Pew Research Center study, in May 2011, 31% of all American adults had a smart phone (one which the user can use to read email and surf the Internet). A communications professor at a university believes this percentage is higher among community college students. She selects 352 community college students at random and finds that 129 of them have a smart phone. In testing the hypotheses: H0: p = 0.31 versus Ha: p > 0.31, she calculates...
According to a Pew Research Center study, in May 2011, 33% of all American adults had a smart phone (one which the user can use to read email and surf the Internet). A communications professor at a university believes this percentage is higher among community college students. She selects 349 community college students at random and finds that 138 of them have a smart phone. In testing the hypotheses: H0: p = 0.33 versus Ha: p > 0.33, she calculates...