America's young people are heavy Internet users; 87% of Americans ages 12 to 17 are Internet...
America's young people are heavy Internet users; 87% of Americans ages 12 to 17 are Internet users (The Cincinnati Enquirer, February 7, 2006). MySpace was voted the most popular website by 9% in a sample survey of Internet users in this age group. Suppose 1,550 youths participated in the survey. What is the margin of error, and what is the interval estimate of the population proportion for which MySpace is the most popular website? Use a 95% confidence level and round your answers to 3 decimals. For interval estimate Enter your answer using parentheses and a comma, in the form (n1,n2). Do not use commas in your numerical answer (i.e. use 1200 instead of 1,200, etc.)
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America's young people are heavy Internet users; 87% of
Americans ages 12 to 17 are Internet...
eBook Fewer young people are driving. In 1983, 87% of 19-year-alds had a driver's license. Twenty-five...
eBook Fewer young people are driving. In 1983, 87% of 19-year-alds had a driver's license. Twenty-five years later that percentage had dropped to 75% (University of Michigan Transportation Research Institute website, April 7, 2012). Suppase these results are based ana random sample of 1200 19-year-olds in 1983 and again in 2008. . At 95% confidence, what is the margin of emor and the interval estimate of the number of 19-year-old drivers in 1983? Round your intermediate answers to four decimal...
According to the Canadian Internet Use Survey conducted by Statistics Canada in 2018, 74% of Canadian...
According to the Canadian Internet Use Survey conducted by Statistics Canada in 2018, 74% of Canadian seniors (65 and over) used the Internet on a daily or near-daily basis. A market researcher wishes to estimate, the current (Summer 2020) proportion of all Canadian seniors who use the Internet on a regular basis. (a) How large should the sample size be so that a 96 % confidence interval for the proportion of all Canadian seniors who use the Internet on a...
Although older Americans are most afraid of crime, it is young people who are more likely to be t...
Although older Americans are most afraid of crime, it is young people who are more likely to be the actual victims of crime. It seems that older people are more cautious about the people with whom they associate. A national survey showed that 10% of all people ages 16-19 have been victims of crime.† At Jefferson High School, a random sample of n = 66 students (ages 16-19) showed that r = 9 had been victims of a crime. Note:...
The average expenditure on Valentine's Day was expected to be $100.89 (USA Today, February 13, 2006)....
The average expenditure on Valentine's Day was expected to be $100.89 (USA Today, February 13, 2006). Do male and female consumers differ in the amounts they spend? The average expenditure in a sample survey of 48 male consumers was $139.5, and the average expenditure in a sample survey of 37 female consumers was $65.76. Based on past surveys, the standard deviation for male consumers is assumed to be $35, and the standard deviation for female consumers is assumed to be...
Many employers are concerned about employees wasting time by surfing the Internet and e-mailing friends during...
Many employers are concerned about employees wasting time by surfing the Internet and e-mailing friends during work hours. The article "Who Goofs Off 2 Hours a Day? Most Workers, Survey Says" summarized data from a large sample of workers.† Suppose that the CEO of a large company wants to determine whether the mean wasted time during an 8-hour workday for employees of her company is less than the mean of 120 minutes reported in the article. Each person in a...
photos for each question are all in a row (1 point) In the following questions, use...
photos for each question are all in a row
(1 point) In the following questions, use the normal distribution to find a confidence interval for a difference in proportions pu - P2 given the relevant sample results. Give the best point estimate for p. - P2, the margin of error, and the confidence interval. Assume the results come from random samples. Give your answers to 4 decimal places. 300. Use 1. A 80% interval for pı - P2 given that...
SYNOPSIS The product manager for coffee development at Kraft Canada must decide whether to introduce the...
SYNOPSIS The product manager for coffee development at Kraft Canada must decide whether to introduce the company's new line of single-serve coffee pods or to await results from the product's launch in the United States. Key strategic decisions include choosing the target market to focus on and determining the value proposition to emphasize. Important questions are also raised in regard to how the new product should be branded, the flavors to offer, whether Kraft should use traditional distribution channels or...
eBook Fewer young people are driving. In 1983, 87% of 19-year-alds had a driver's license. Twenty-five years later that percentage had dropped to 75% (University of Michigan Transportation Research Institute website, April 7, 2012). Suppase these results are based ana random sample of 1200 19-year-olds in 1983 and again in 2008. . At 95% confidence, what is the margin of emor and the interval estimate of the number of 19-year-old drivers in 1983? Round your intermediate answers to four decimal...
According to the Canadian Internet Use Survey conducted by Statistics Canada in 2018, 74% of Canadian seniors (65 and over) used the Internet on a daily or near-daily basis. A market researcher wishes to estimate, the current (Summer 2020) proportion of all Canadian seniors who use the Internet on a regular basis. (a) How large should the sample size be so that a 96 % confidence interval for the proportion of all Canadian seniors who use the Internet on a...
The average expenditure on Valentine's Day was expected to be $100.89 (USA Today, February 13, 2006). Do male and female consumers differ in the amounts they spend? The average expenditure in a sample survey of 48 male consumers was $139.5, and the average expenditure in a sample survey of 37 female consumers was $65.76. Based on past surveys, the standard deviation for male consumers is assumed to be $35, and the standard deviation for female consumers is assumed to be...
photos for each question are all in a row
(1 point) In the following questions, use the normal distribution to find a confidence interval for a difference in proportions pu - P2 given the relevant sample results. Give the best point estimate for p. - P2, the margin of error, and the confidence interval. Assume the results come from random samples. Give your answers to 4 decimal places. 300. Use 1. A 80% interval for pı - P2 given that...
SYNOPSIS The product manager for coffee development at Kraft Canada must decide whether to introduce the company's new line of single-serve coffee pods or to await results from the product's launch in the United States. Key strategic decisions include choosing the target market to focus on and determining the value proposition to emphasize. Important questions are also raised in regard to how the new product should be branded, the flavors to offer, whether Kraft should use traditional distribution channels or...
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