In an advertising study done for Stoked magazine, a random sample of subscribers was selected. Each...
In an advertising study done for Stoked magazine, a random sample of subscribers was selected. Each subscriber in the sample was asked to recall advertisements in this month’s edition of the magazine. The average number of advertisements recalled by the sample members was 8.2, with a sample standard deviation of 3.6. Show the appropriate 95% confidence interval for the population mean number of advertisements recalled if the size of the sample is a. 15 b. 150
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In an advertising study done for Stoked magazine, a random
sample of subscribers was selected. Each...
A magazine published a study of subscribers' salaries. The 245 subscribers sampled had a mean salary...
A magazine published a study of subscribers' salaries. The 245 subscribers sampled had a mean salary of $116,784 and a standard deviation of $39,157.Suppose the goal of the study is to estimate the true mean salary of all subscribers. The magazine has 2,098 total subscribers. a. Estimate the mean with an approximate 95% confidence interval. The magazine estimates the true mean salary of each subscriber to be in the interval _____ to _______. (Round to the nearest dollar as needed.)
The results of a sample of 372 subscribers to Wired magazine shows the time spent using...
The results of a sample of 372 subscribers to Wired magazine shows the time spent using the Internet during the week. Previous surveys have revealed that the population standard deviation is 10.95 hours. What is the probability that another sample of 372 subscribers spends less than 19.00 hours per week using the Internet? Descriptive statistics Column1 count 372 mean 18.54 sample standard deviation 10.81 sample variance 116.75 minimum 2 maximum 38 range 36 standard error of the mean 0.56 confidence...
A study of women’s weights found that a randomly selected sample of 150 women had a...
A study of women’s weights found that a randomly selected sample of 150 women had a mean weight of 147.3 lb. Assuming that the population standard deviation is 19.6 lb., construct a 95% confidence interval estimate of the mean weight of all women. Choose the correct interval from below: Choose one • 10 points (144.211, 150.389) (140.611, 146.789) (144.667, 149.933) (144.163, 150.437)
An independent random sample is selected from an approximately normal population with an unknown standard deviation....
An independent random sample is selected from an approximately normal population with an unknown standard deviation. a) Given the sample mean = 24.3, sample standard deviation = 8.5, and sample size = 32, compute the standard error. The standard error = b) Using a confidence coefficient of 2.04, compute the confidence interval. The 95% confidence interval goes from to (Enter the smaller number first.) c) Based on the confidence interval above, which of the following values are plausible? (Choose all...
s. A random sample of 5 athletic students was selected, them. The sample data is listed as foows 41↓49-452446a- normal population, construct a 95% confidence interval for the then the resting hea...
s. A random sample of 5 athletic students was selected, them. The sample data is listed as foows 41↓49-452446a- normal population, construct a 95% confidence interval for the then the resting heart rate (unit beats per ach ore S (a) Assuming all athletic st e students. Your final result is Keep 3 decimals) (20 points) Based on this sample, a new study is designed to construct a 95% confidence interval for the averag (10 p resting heart rate for all...
Independent random samples were selected from two binomial populations, with sample sizes and the number of...
Independent random samples were selected from two binomial populations, with sample sizes and the number of successes given below. Population 1 2 500 500 120 147 Sample Size Number of Successes Construct a 95% confidence interval for the difference in the population proportions. (Use P, - Pg. Round your answers to four decimal places.) - 1087 to
Question 5. A random sample of 50 bottles of a brand of cough syrup is selected, and the alcohol content of each bottle...
Question 5. A random sample of 50 bottles of a brand of cough syrup is selected, and the alcohol content of each bottle is measured. Let μ be the mean alcohol content for the population of all bottles of the brand under consideration. The 95% confidence interval estimated from the data is (7.8 μ 9.4). (a) would a 90% confidence interval calculated from the same sample be wider or narrower? Explain. (b) Consider the statement: there is a 95% chance...
1. A sample size of n-20 is a simple random sample selected from a normally distributed...
1. A sample size of n-20 is a simple random sample selected from a normally distributed population. Find the critical value ta2 corresponding to a 95% confidence level. 2.093 O 2.086 02.861 1.960 2. Assume you want to construct a 90% confidence interval from sample of a distributed population. The sample size is 37. Find the critical value to2 1.687 2.719 1.688 O1.645 3. You are constructing a 95% confidence interval of a sample space consisting of n = 40...
2. 22 random samples were selected from a population that has a normal distribution. The sample...
2. 22 random samples were selected from a population that has a normal distribution. The sample (1 point) has a mean of 99 and a standard deviation of 5 . Construct a 95% confidence interval for the population standard deviation 76 < σ < 141 3.What are the critical values 2? and 2 that correspond to a 99% confidence level and a (lpom) sample size of 30? 13.121, 52.336 13.787, 53.672 14.257, 49.588 19.768, 39.087
A random sample of 20 healthy adults eating a traditional American diet is selected. They agree...
A random sample of 20 healthy adults eating a traditional American diet is selected. They agree to adopt a vegetarian diet for 1 month . Based on their 20 sample cholesterol change values, a 95% one-sample t confidence interval for the population mean change in blood cholesterol level after switching diet is reported as the interval -27.9 to -11.6 mg/dl. If we use a matched-pairs t confidence interval in some statistical software with the 20 sample cholesterol values at the...
An independent random sample is selected from an approximately normal population with an unknown standard deviation. a) Given the sample mean = 24.3, sample standard deviation = 8.5, and sample size = 32, compute the standard error. The standard error = b) Using a confidence coefficient of 2.04, compute the confidence interval. The 95% confidence interval goes from to (Enter the smaller number first.) c) Based on the confidence interval above, which of the following values are plausible? (Choose all...
s. A random sample of 5 athletic students was selected, them. The sample data is listed as foows 41↓49-452446a- normal population, construct a 95% confidence interval for the then the resting heart rate (unit beats per ach ore S (a) Assuming all athletic st e students. Your final result is Keep 3 decimals) (20 points) Based on this sample, a new study is designed to construct a 95% confidence interval for the averag (10 p resting heart rate for all...
Independent random samples were selected from two binomial populations, with sample sizes and the number of successes given below. Population 1 2 500 500 120 147 Sample Size Number of Successes Construct a 95% confidence interval for the difference in the population proportions. (Use P, - Pg. Round your answers to four decimal places.) - 1087 to
Question 5. A random sample of 50 bottles of a brand of cough syrup is selected, and the alcohol content of each bottle is measured. Let μ be the mean alcohol content for the population of all bottles of the brand under consideration. The 95% confidence interval estimated from the data is (7.8 μ 9.4). (a) would a 90% confidence interval calculated from the same sample be wider or narrower? Explain. (b) Consider the statement: there is a 95% chance...
1. A sample size of n-20 is a simple random sample selected from a normally distributed population. Find the critical value ta2 corresponding to a 95% confidence level. 2.093 O 2.086 02.861 1.960 2. Assume you want to construct a 90% confidence interval from sample of a distributed population. The sample size is 37. Find the critical value to2 1.687 2.719 1.688 O1.645 3. You are constructing a 95% confidence interval of a sample space consisting of n = 40...
2. 22 random samples were selected from a population that has a normal distribution. The sample (1 point) has a mean of 99 and a standard deviation of 5 . Construct a 95% confidence interval for the population standard deviation 76 < σ < 141 3.What are the critical values 2? and 2 that correspond to a 99% confidence level and a (lpom) sample size of 30? 13.121, 52.336 13.787, 53.672 14.257, 49.588 19.768, 39.087
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