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RUIZ KUIGIT This Question: 1 pt 4 of 7 (0 complete) You want to do a...
You want to construct a confidence interval for the mean hours of sleep for all college...
You want to construct a confidence interval for the mean hours of sleep for all college students and you want to find the appropriate sample size for some constraints outlined below. Assume you know the population standard deviation (σ) is 1.45 hours. (a) Estimate the sample size required to be 95% confident that the sample mean is within 0.2 hours of the population mean for college students. The minimum sample size is ___ students. (b) Estimate the sample size required...
part 1. You want to obtain a sample to estimate how much parents spend on their...
part 1. You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you believe the population standard deviation is approximately σ=63.5σ=63.5 dollars. You would like to be 95% confident that your estimate is within 1 dollar(s) of average spending on the birthday parties. How many parents do you have to sample? n= part 2. In a survey, 10 people were asked how much they spent on their child's last...
Question 5 3 pts You want to estimate o for the population of waiting times for...
Question 5 3 pts You want to estimate o for the population of waiting times for hospital emergency rooms. You want to be 99% confident that the sample standard deviation is within 1% of o. A Find the minimum sample size. n = B. Which has a bigger impact on the sample size requirement? i. Changing the confidence level to 90% or ii. Changing the margin of error to be within 10% of o or iii. Neither has a greater...
You want to find a sample to estimate how much couples will spend on their first...
You want to find a sample to estimate how much couples will spend on their first date. Based on previous study, you believe the population standard deviation is approximately o = 26.3 dollars. You would like to be 90% confident that your estimate is within 1 dollar(s) of average spending on their first date. How many couples do you have to sample? n-
7. You want to estimate the mean weight loss of people one year after using a...
7. You want to estimate the mean weight loss of people one year after using a popular weight-loss (1 point) program being advertised on TV. How many people on that program must be surveyed if we want to be 95% confident that the sample mean weight loss is within 0.25 ib of the true population mean? Assume that the population standard deviation is known to be 10.6 lb. 6907 0 4865 O 84 O6906 3. Given the standard deviation of...
This Question: 1 pt 6 of 14 (0 complete) This Quiz: 14 pts possi A binomial...
This Question: 1 pt 6 of 14 (0 complete) This Quiz: 14 pts possi A binomial experiment is given. Decide whether you can use the normal distribution to approximate the binomial distribution. If you can find the mean and standard deviation. If you cannot, explain why. A survey of adults found that 64% have used a multivitamin in the past 12 months. You randomly select 40 adults and ask them if they have used a multivitamin in the past 12...
R=5 please use z table for distribution question (a) A researcher plans to carry out a...
R=5
please use z table for distribution question
(a) A researcher plans to carry out a study to estimate the proportion of residents in a city who have travelled abroad last year. If he wants to be 95% confident that the estimate is accurate to within (2.73 + ) %, find the minimum sample size that is required. (3 marks) A researcher plans to carry out a study to estimate the mean age of teachers in a city. If he...
Suppose you are interested in finding out how happy the students are at UNR. You design...
Suppose you are interested in finding out how happy the students are at UNR. You design a survey that probes aspects of an individual’s emotional life, and using this survey are able to compute an accuracy index score ranging from 0 (completely miserable) to 100 (nauseatingly happy). You know that the standard deviation of the population (sigma) equals 8; however you do not know, and want to know, what the mean of the population (mu) is. Rather than give the...
A professor's sample estimated the standard deviation of missing assignments to be 3. You are researching...
A professor's sample estimated the standard deviation of missing assignments to be 3. You are researching the average missing assignments. You want to know how many people you should survey if you want to know, at a 90% confidence level, that the sample mean amount of missing assignments is within 1 assignments of the true mean number of missing assignments. Use a calculator to find the z- value that you should you use to calculate the 90% confidence level. Round...
please answer questions 7,9,10 A certain small town has a population of 5000 residents. You want to calculate a c...
please answer questions 7,9,10
A certain small town has a population of 5000 residents. You want to calculate a confidence interval for the average number of gallons of gas bought per month by the residents of this town. You want to be 95% confident that the true value of the population mean is within your interval, and you need to have a margin of error no higher than 10 gallons per month. Based on your previous research in similar towns,...
Question 5 3 pts You want to estimate o for the population of waiting times for hospital emergency rooms. You want to be 99% confident that the sample standard deviation is within 1% of o. A Find the minimum sample size. n = B. Which has a bigger impact on the sample size requirement? i. Changing the confidence level to 90% or ii. Changing the margin of error to be within 10% of o or iii. Neither has a greater...
You want to find a sample to estimate how much couples will spend on their first date. Based on previous study, you believe the population standard deviation is approximately o = 26.3 dollars. You would like to be 90% confident that your estimate is within 1 dollar(s) of average spending on their first date. How many couples do you have to sample? n-
7. You want to estimate the mean weight loss of people one year after using a popular weight-loss (1 point) program being advertised on TV. How many people on that program must be surveyed if we want to be 95% confident that the sample mean weight loss is within 0.25 ib of the true population mean? Assume that the population standard deviation is known to be 10.6 lb. 6907 0 4865 O 84 O6906 3. Given the standard deviation of...
This Question: 1 pt 6 of 14 (0 complete) This Quiz: 14 pts possi A binomial experiment is given. Decide whether you can use the normal distribution to approximate the binomial distribution. If you can find the mean and standard deviation. If you cannot, explain why. A survey of adults found that 64% have used a multivitamin in the past 12 months. You randomly select 40 adults and ask them if they have used a multivitamin in the past 12...
R=5
please use z table for distribution question
(a) A researcher plans to carry out a study to estimate the proportion of residents in a city who have travelled abroad last year. If he wants to be 95% confident that the estimate is accurate to within (2.73 + ) %, find the minimum sample size that is required. (3 marks) A researcher plans to carry out a study to estimate the mean age of teachers in a city. If he...
please answer questions 7,9,10
A certain small town has a population of 5000 residents. You want to calculate a confidence interval for the average number of gallons of gas bought per month by the residents of this town. You want to be 95% confident that the true value of the population mean is within your interval, and you need to have a margin of error no higher than 10 gallons per month. Based on your previous research in similar towns,...
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