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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-
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...
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...
Hi. Please help with these 4 problems. I keep getting the incorrect answer and i dont...
Hi. Please help with these 4 problems. I keep getting the incorrect answer and i dont know what I am doing wrong :( Thank you in advance. 1) You want to obtain a sample to estimate a population proportion. Based on previous evidence you believe the population proportion is approximately p= 0.31. You would like to be 90% confident that your estimate is within 2.5% of the true population proportion. How large of a sample size required. I got 932...
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...
Minimum sample sizes. a. A market researcher wishes to determine the proportion of American women who...
Minimum sample sizes. a. A market researcher wishes to determine the proportion of American women who shop online. The results must be accurate at the 90% level of confidence with a maximum error of 2%. Calculate the minimum sample size needed to meet these requirements, given that a previous study estimated that 59% of American women shop online. b. Emma is assigned the task of finding the mean number of hours students sleep per night. Her results must be at...
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-
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...
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...
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...
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Question 501 pts
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