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According to recent research, about 15% of all adults nationally who use the internet use Twitter...
Suppose that at a particular college, a random sample found that 25 out of 100 students...
Suppose that at a particular college, a random sample found that 25 out of 100 students who use the internet use Twitter. Does this provide evidence that the true proportion of students at this college who use Twitter is higher than the nationally stated 15%? Use a significance level of 0.05 and the p-value to give your decision. The correct hypotheses to use are: Ho: p = 0.15 HA: p > 0.15 Blank #1: Report the test statistic to two...
According to a report by the PEW Research Center, 85% of adults under 30 feel optimistic...
According to a report by the PEW Research Center, 85% of adults under 30 feel optimistic about the economy, but the optimism is shared by only 45% of those who are over 50 (Newsweek, September 13, 2010). A research analyst would like to construct 95% confidence intervals for the proportion patterns in various regions of the country. She uses the reported rates by the PEW Research Center to determine the sample size that would restrict the margin of error to...
A sample of 262 adults is selected. The adults are classified according to their voter registration...
A sample of 262 adults is selected. The adults are classified according to their voter registration status and their preferred source of current events information. The results are given in the contingency table below. What is the relative frequency of adults in the sample who are registered to vote and prefer to obtain their information through television? Round your answer to two decimal places. Preferred Source of Information Television Newspapers Radio Internet Sites Registered 36 36 27 25...
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 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...
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...
One of the questions in the Pew Internet & American Life Project asked adults if they...
One of the questions in the Pew Internet & American Life Project asked adults if they used the Internet at least occasionally (Pew website, October 23, 2012). The results showed that 454 out of 478 adults aged 18-29 answered Yes; 741 out of 833 adults aged 30 - 49 answered Yes, 1058 out of 1644 adults aged 50 and over answered Yes. User-table Round your answers to four decimal places. 3. Develop a point estimate of the proportion of adults...
According to a recent poll, 27% of adults in a certain area have high levels of...
According to a recent poll, 27% of adults in a certain area have high levels of cholesterol. They report that such elevated levels "could be financially devastating to the regions healthcare system" and are a major concern to health insurance providers. Assume the standard deviation from the recent studies is accurate and known. According to recent studies, cholesterol levels in healthy adults from the area average about 205mg/dL, with a standard deviation of about 30mg/dL, and are roughly Normally distributed....
According to a Pew Research Center study, in May 2011, 32% of all American adults had...
According to a Pew Research Center study, in May 2011, 32% 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 the Internet). A communications professor at a university believes this percentage is higher among community college students. She selects 344 community college students at random and finds that 132 of them have a smart phone. Then in testing the hypotheses:...
According to a recent poll, 29% of adults in a certain area have high levels of...
According to a recent poll, 29% of adults in a certain area have high levels of cholesterol. They report that such elevated levels 'could be financially devastating to the regions healthcare system and are a major concern to health insurance providers. Assume the standard deviation from the recent studies is accurate and known. According to recent studies, cholesterol levels in healthy adults from the area average about 206 mg/dL, with a standard deviation of about 25 mg/dL, and are roughly...
According to a Pew Research Center study, in May 2011, 39% of all American adults had...
According to a Pew Research Center study, in May 2011, 39% 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 317 community college students at random and finds that 143 of them have a smart phone. Then in testing the hypotheses: H0: p = 0.39 versus Ha: p > 0.39, what...
Suppose that at a particular college, a random sample found that 25 out of 100 students who use the internet use Twitter. Does this provide evidence that the true proportion of students at this college who use Twitter is higher than the nationally stated 15%? Use a significance level of 0.05 and the p-value to give your decision. The correct hypotheses to use are: Ho: p = 0.15 HA: p > 0.15 Blank #1: Report the test statistic to two...
According to a report by the PEW Research Center, 85% of adults under 30 feel optimistic about the economy, but the optimism is shared by only 45% of those who are over 50 (Newsweek, September 13, 2010). A research analyst would like to construct 95% confidence intervals for the proportion patterns in various regions of the country. She uses the reported rates by the PEW Research Center to determine the sample size that would restrict the margin of error to...
One of the questions in the Pew Internet & American Life Project asked adults if they used the Internet at least occasionally (Pew website, October 23, 2012). The results showed that 454 out of 478 adults aged 18-29 answered Yes; 741 out of 833 adults aged 30 - 49 answered Yes, 1058 out of 1644 adults aged 50 and over answered Yes. User-table Round your answers to four decimal places. 3. Develop a point estimate of the proportion of adults...
According to a Pew Research Center study, in May 2011, 32% 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 the Internet). A communications professor at a university believes this percentage is higher among community college students. She selects 344 community college students at random and finds that 132 of them have a smart phone. Then in testing the hypotheses:...
According to a recent poll, 29% of adults in a certain area have high levels of cholesterol. They report that such elevated levels 'could be financially devastating to the regions healthcare system and are a major concern to health insurance providers. Assume the standard deviation from the recent studies is accurate and known. According to recent studies, cholesterol levels in healthy adults from the area average about 206 mg/dL, with a standard deviation of about 25 mg/dL, and are roughly...
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