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Mathematics, 10.03.2020 02:31 silasjob09
According to a Pew Research Center study, in May 2011, 35% 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 300 community college students at random and finds that 120 of them have a smart phone. In testing the hypotheses H0: p = 0.35 versus Ha: p > 0.35, she calculates the test statistic as Z = 1.82. Assume the significance level is ? = 0.10.
Which of the following is an appropriate conclusion for the hypothesis test?
There is enough evidence to show that more than 35% of community college students own a smart phone (P?value = 0.034).
There is enough evidence to show that more than 35% of community college students own a smart phone (P?value = 0.068).
There is not enough evidence to show that more than 35% of community college students own a smart phone (P?value = 0.966).
There is not enough evidence to show that more than 35% of community college students own a smart phone (P?value = 0.034).
Does secondhand smoke increase the risk of a low weight birth? A baby is "low birth weight" if it weighs less than 5.5 pounds at birth. According to the National Center of Health Statistics, about 7.8% of all babies born in the U. S. are categorized as low birth weight. Researchers randomly select 1200 babies whose mothers had extensive exposure to secondhand smoke during pregnancy. 10.4% of the sample are categorized as low birth weight.
Answer the following:
Which of the following are the appropriate null and alternative hypotheses for this research question.
H0: p = 0.078; Ha: p ? 0.078
H0: p = 0.078; Ha: p > 0.078
H0: p = 0.104; Ha: p ? 0.104
H0: ? = 0.104; Ha: ? > 0.104
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