In order to conduct a study of percentage of nation's asthmatics who are allergic to sulfites,...
In order to conduct a study of percentage of nation's asthmatics who are allergic to sulfites, a random sample of how many asthmatics should be selected to ensure a margin of error of at most five percentage points, for a 90% confidence interval?
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In order to conduct a study of percentage of nation's asthmatics
who are allergic to sulfites,...
Hays Medical Center wants to estimate the percentage of adults who exercise at least 1 hour...
Hays Medical Center wants to estimate the percentage of adults who exercise at least 1 hour per week. How large a sample should be selected in order to estimate this proportion with a 90% confidence level and a margin of error of at most 5%? (Assume no preliminary estimate of p-hat is available.)
Question 15: (10 points) Suppose a consumer advocacy group would like to conduct a survey to...
Question 15: (10 points) Suppose a consumer advocacy group would like to conduct a survey to find the proportion p of consumers who bought the newest generation of a PlayStation player were happy with their purchase. a) How large a sample n should they take to estimate p with 2% margin of error and 90% confidence? b) The advocacy group took a random sample of 1000 consumers who recently purchased this PlayStation player and found that 300 were happy with...
College officials want to estimate the percentage of students who carry a gun, knife, or other...
College officials want to estimate the percentage of students who carry a gun, knife, or other such weapon. How many randomly selected students must be surveyed in order to be 98% confident that the sample percentage has a margin of error of 2 percentage points? (a) Assume that there is no available information that could be used as an estimate of ?̂ p^. n= (b) Assume that another study indicated that 7%7% of college students carry weapons. n=
Mean Income of NYC Household Heads: Suppose researchers want to conduct a study on the mean...
Mean Income of NYC Household Heads: Suppose researchers want to conduct a study on the mean income of NYC household heads. From previous studies they know that the standard deviation in the population is approximately $30,000. 1) How large should a simple random sample be to estimate mean income with a standard error of $1,000? Show all main steps of your calculation. (No points will be given to an answer of only a final number provided even if the number...
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....
Hours after a governor was indicted on several counts of fraud and extortion, two reputable research...
Hours after a governor was indicted on several counts of fraud and extortion, two reputable research firms polled citizens from the region asking whether they thought the governor should resign. The first poll revealed that 60% people in the region felt the governor should resign; it had a margin of error of plus or minus 4.8 percentage points. The other poll reported that 55% people in the region felt the governor should resign; it had a margin of error of...
In preparing a report on the economy, we need to estimate the percentage of businesses that...
In preparing a report on the economy, we need to estimate the
percentage of businesses that plan to hire additional employees in
the next 60 days.
a) How many randomly selected employers must we contact in
order to create an estimate in which we are 99% confident with a
margin of error of 99%?
b) Suppose we want to reduce the margin of error to 44%. What
sample size will suffice?
c) Why might it not be worth the effort...
A political candidate has asked you to conduct a poll to determine what percentage of people...
A political candidate has asked you to conduct a poll to determine what percentage of people support him. If the candidate only wants a 2% margin of error at a 90% confidence level, what size of sample is needed?
4. (5 pts.) A pilot study of 270 Canadian people last year had 221 who thought...
4. (5 pts.) A pilot study of 270 Canadian people last year had 221 who thought that doctor-assisted suicide should be permitted. We want to estimate the current proportion of Canadian people who think that doctor-assisted suicide should be permitted to within 3 percentage points with a 90% confidence interval. How large a sample is needed?
The following summary of a statistical study gives a sample statistic and margin of error. Find...
The following summary of a statistical study gives a sample statistic and margin of error. Find the confidence interval and answer any additional questions. A poll is conducted the day before a state election for senator. There are only two candidates running for this office. The poll results show that 60% of the voters favor the republican candidate, with a margin of error of 2 percentage points. Should the Republican candidate expect to win? Why or why not? The confidence...
Question 15: (10 points) Suppose a consumer advocacy group would like to conduct a survey to find the proportion p of consumers who bought the newest generation of a PlayStation player were happy with their purchase. a) How large a sample n should they take to estimate p with 2% margin of error and 90% confidence? b) The advocacy group took a random sample of 1000 consumers who recently purchased this PlayStation player and found that 300 were happy with...
Hours after a governor was indicted on several counts of fraud and extortion, two reputable research firms polled citizens from the region asking whether they thought the governor should resign. The first poll revealed that 60% people in the region felt the governor should resign; it had a margin of error of plus or minus 4.8 percentage points. The other poll reported that 55% people in the region felt the governor should resign; it had a margin of error of...
In preparing a report on the economy, we need to estimate the
percentage of businesses that plan to hire additional employees in
the next 60 days.
a) How many randomly selected employers must we contact in
order to create an estimate in which we are 99% confident with a
margin of error of 99%?
b) Suppose we want to reduce the margin of error to 44%. What
sample size will suffice?
c) Why might it not be worth the effort...
4. (5 pts.) A pilot study of 270 Canadian people last year had 221 who thought that doctor-assisted suicide should be permitted. We want to estimate the current proportion of Canadian people who think that doctor-assisted suicide should be permitted to within 3 percentage points with a 90% confidence interval. How large a sample is needed?
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