John is assigned to do research to estimate the percentage of Europeans that attended party’s after...
John is assigned to do research to estimate the percentage of Europeans that attended party’s after Christmas . The results need to be within 3 percentage points with a 96% confidence level. There is not a previous estimate to work with. How many people must Jon survey?
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John is assigned to do research to estimate the percentage of
Europeans that attended party’s after...
In an initial survey designed to estimate the percentage of time air-express cargo loaders are idle,...
In an initial survey designed to estimate the percentage of time air-express cargo loaders are idle, an analyst found that loaders were idle in 8 of the 60 observations. a. What is the estimated percentage of idle time? (Round your answer to 2 decimal places. Omit the "%" sign in your response.) Estimated percentage of idle time 5 points b. Based on the initial results, approximately how many observations would you require to estimate the actual percentage of idle time...
#470. Confidence Intervals A survey is carried out at a university to estimate the percentage of...
#470. Confidence Intervals A survey is carried out at a university to estimate the percentage of undergraduate students who drive to campus to attend classes. If the SD of the population was 25%, then how many people would we need to poll to get a 90% confidence interval with a 2% margin of error? Remember that our answer is about actual people -- to answer this question you must round number to your up the nearest whole number (if you...
Find the sample size, n, needed to estimate the percentage of adults who have consulted fortune...
Find the sample size, n, needed to estimate the percentage of adults who have consulted fortune tellers. Use a 0.04 margin of error, use a confidence level of 98% and use results from a prior poll suggesting that 11% of adults have consulted fortune tellers. A student wants to estimate the mean score of all college students for a particular exam. First use the range rule of thumb to make a rough estimate of the standard deviation of those scores....
4. You have been hired by the Ford Motor Company to do market research, and you must estimate the percentage of households in which a vehicle is owned. How to be 99% confident that your sample a....
4. You have been hired by the Ford Motor Company to do market research, and you must estimate the percentage of households in which a vehicle is owned. How to be 99% confident that your sample a. Assume that a previous study suggested that vehicles are owned in 8S% of households (10pts) households mast you survey if you want percentage has a margin of erro rof three percentage points? b. Assume that instead of using randomly selected household readers of...
3. The Pew Research Center wishes to estimate the proportion of adults who are aware of...
3. The Pew Research Center wishes to estimate the proportion of adults who are aware of Instagram. How many adults must the marketing firm randomly survey if they want to be 96% confident that the proportion of adults who are aware of Instagram is within 3% of the true proportion of adults who are aware of Instagram? Enter answer 4 The mean age of a sample of 40 college students is 23.95 with a standard deviation of 2.55. Assume that...
Problem A: A market research director at LED Electronics wants to study women’s spending on electronics....
Problem A: A market research director at LED Electronics wants to study women’s spending on electronics. A survey of the store’s credit card holders is designed in order to estimate the proportion of women who purchase their electronics primarily from LED Electronics and the mean yearly amount of money that women spend on electronics. A previous survey found that the standard deviation for the amount women spend on electronics in a year is approximately $35. Cannot use PHstat or Excel...
6. How many randomly selected adults must be surveyed to estimate the percentage of adults in...
6. How many randomly selected adults must be surveyed to estimate the percentage of adults in ( point) the country who now use the Internet? Assume that you want to be 99% confident that the sample percentage is within 2 percentage points of the true population percentage and that you know nothing about the percentage of adults using the Internet. 16,577 O 4,145 O 2,401 O 613 (l point 7-A recent poll of 1800 people showed that 35% believe gas...
In an initial survey designed to estimate the percentage of time air-express cargo loaders are idle,...
In an initial survey designed to estimate the percentage of time air-express cargo loaders are idle, an analyst found that loaders were idle in 8 of the 45 observations. a. What is the estimated percentage of idle time? (Round your answer to 2 decimal places. Omit the "%" sign in your response.) Estimated percentage of idle time % b. Based on the initial results, approximately how many observations would you require to estimate the actual percentage of idle time...
significance level is .05 10. Towson University wants to estimate how many hours per week students work at paying jobs. How many students do they need to survey, in order to have an estimate, to wi...
significance level is .05
10. Towson University wants to estimate how many hours per week students work at paying jobs. How many students do they need to survey, in order to have an estimate, to within a half hour, the mean number of hours a TU student works per week? Assume that in a survey done five years ago, the sample standard deviation was.42 hours.
10. Towson University wants to estimate how many hours per week students work at paying...
6.1.31 Question Help | * Find the minimum sample size n needed to estimate μ for...
6.1.31 Question Help | * Find the minimum sample size n needed to estimate μ for the given values of c, σ, and E. cz 0.98, ơ-7.7, and E: 1 Assume that a preliminary sample has at least 30 members. n(Round up to the nearest whole number.) 6.1.47 Question Help People were polled on how many books they read the previous year. How many subjects are needed to estimate the number of books read the previous year within one book...
In an initial survey designed to estimate the percentage of time air-express cargo loaders are idle, an analyst found that loaders were idle in 8 of the 60 observations. a. What is the estimated percentage of idle time? (Round your answer to 2 decimal places. Omit the "%" sign in your response.) Estimated percentage of idle time 5 points b. Based on the initial results, approximately how many observations would you require to estimate the actual percentage of idle time...
#470. Confidence Intervals A survey is carried out at a university to estimate the percentage of undergraduate students who drive to campus to attend classes. If the SD of the population was 25%, then how many people would we need to poll to get a 90% confidence interval with a 2% margin of error? Remember that our answer is about actual people -- to answer this question you must round number to your up the nearest whole number (if you...
4. You have been hired by the Ford Motor Company to do market research, and you must estimate the percentage of households in which a vehicle is owned. How to be 99% confident that your sample a. Assume that a previous study suggested that vehicles are owned in 8S% of households (10pts) households mast you survey if you want percentage has a margin of erro rof three percentage points? b. Assume that instead of using randomly selected household readers of...
3. The Pew Research Center wishes to estimate the proportion of adults who are aware of Instagram. How many adults must the marketing firm randomly survey if they want to be 96% confident that the proportion of adults who are aware of Instagram is within 3% of the true proportion of adults who are aware of Instagram? Enter answer 4 The mean age of a sample of 40 college students is 23.95 with a standard deviation of 2.55. Assume that...
6. How many randomly selected adults must be surveyed to estimate the percentage of adults in ( point) the country who now use the Internet? Assume that you want to be 99% confident that the sample percentage is within 2 percentage points of the true population percentage and that you know nothing about the percentage of adults using the Internet. 16,577 O 4,145 O 2,401 O 613 (l point 7-A recent poll of 1800 people showed that 35% believe gas...
significance level is .05
10. Towson University wants to estimate how many hours per week students work at paying jobs. How many students do they need to survey, in order to have an estimate, to within a half hour, the mean number of hours a TU student works per week? Assume that in a survey done five years ago, the sample standard deviation was.42 hours.
10. Towson University wants to estimate how many hours per week students work at paying...
6.1.31 Question Help | * Find the minimum sample size n needed to estimate μ for the given values of c, σ, and E. cz 0.98, ơ-7.7, and E: 1 Assume that a preliminary sample has at least 30 members. n(Round up to the nearest whole number.) 6.1.47 Question Help People were polled on how many books they read the previous year. How many subjects are needed to estimate the number of books read the previous year within one book...
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