In a sample of 850 U.S. adults, 173 of them reported that they prefer working out at the gym with a trainer. Assume the sample is randomly selected from a normally distributed population. a) Find the sample proportion b) Find the sample standard deviation c) Construct a 99% confidence interval for the population proportion and interpret.

Q: Given that 200 items of 800 are defective, construct the following confidence intervals for the…

A:

Q: d) Compute the margin of error, E. 1. At Abraham Lincoln High School an achievement test is…

A: d) Suppose µ is the population mean score for Abraham Lincoln High School.

Q: Find the 95% confidence interval for the standard deviation of the weight of ten-gallon drums of…

A:

Q: A sample of 20 part-time workers had mean annual earnings of $3120 with a standard deviation of…

A: As the population standard deviation is not known, we will use t distribution. df = n-1= 20-1=19…

Q: A survey of several 8 to 11 year olds recorded the following amounts spent on a trip to the mall:…

A: The amounts spent on a trip to the mall is 19.36,29.95,7.82,8.36,21.07,14.06,22.22

Q: According to a survey, 66% of all students in the U. S. own a laptop. For a simple random sample of…

A:

Q: John wanted to know the percentage of Plug-in Hybrid Elective Vehicle (or PHEV) on the road in the…

A: From the above given data the following solution is provided below:

Q: The weights of four randomly chosen bags of horse carrots, each bag labeled 20 pounds, were 20.2,…

A: Given: Sample size (n) = 4 20.2 19.7 20.9 20 Confidence level = 0.95

Q: Researchers randomly selected 50 males between the ages of 25 and 44 years to participate in a…

A: The given 95% confidence interval for the proportion of all males between 25 and 44 years old with…

Q: According to a survey, 66% of all students in the U. S. own a laptop. For a simple random sample of…

A:

Q: 95%confidence interval estimate of the population standard deviation 64 60 60 56 60 54 61 60 61 70…

A: given data : 64,60,60,56,60,54,61,60,61,70

Q: The weights of four randomly chosen bags of horse carrots, each bag labeled 20 pounds, were 20.4,…

A: given that,sample data: (20.4 , 19.9 , 20.8 , 20 )sample mean, x =20.275standard deviation, s…

Q: A survey of several 9 to 11 year olds recorded the following amounts spent on a trip to the mall:…

A: From the provided information,Sample size (n) = 7Confidence level = 95%

Q: A random sample of 500 items reveals that 325 of the items have the attribute of interest. a. What…

A: Solution: a. Let X be the number of items have the attribute of interest and n be the sample number…

Q: A national air traffic control system handled an average of 47,809 flights during 29 randomly…

A:

Q: 1. The following sample of solar intensity measurements (watts/m2) was collected randomly on…

A: Given data indicates the solar intensity measurements on different days in the country. (a) The…

Q: ) Which distribution table will be used to find the critical value and why? A.) t-table because…

A:

Q: A sample of 50 employees is found to have a mean of $32474 and a standard deviation of $1334. A)…

A:

Q: Use the following information to construct a 90%,95%,& 99% confidence interval : Sample Mean: 111.7…

A:

Q: Of 1005 adults in a certain country responding to a​ poll, 47% said they always or often read…

A: (a)   Obtain the 95% confidence interval for the population proportion of adults in the country who…

Q: In a sample of 81 U.S. adults aged 18-24 who celebrate Halloween, the mean amount spent on a costume…

A: a) We are estimating the population mean amount spent on a costume by U.S. adults aged 18-24 who…

Q: Suppose that Randy is an analyst for the bicyling industry and wants to estimate the asking price of…

A: The summary of the statistics is The degree of freedom is, Critical values: The t-critical values…

Q: Listed in the accompanying data table are student evaluation ratings of courses and​ professors,…

A: (a) Obtain the 98% confidence interval estimate for the population standard deviation of 93 course…

Q: The weights of four randomly chosen bags of horse carrots, each bag labeled 20 pounds, were 20.5,…

A:

Q: Assume that a sample is used to estimate a population proportion p. Find the margin of error M.E.…

A: Proportion is almost similar to the concept of probability. Proportion is a fraction of population…

Q: In a previous study, it was found that p̂= .73 for a particular sample. Suppose we would like to…

A: Given information Error = 0.01 Confidence level = 0.98

Q: Consider the following sample information randomly selected from two populations. Sample 1: n1 =250,…

A:

Q: Construct a 90% confidence interval to estimate the population mean when x = 122 and s = 34 for the…

A: df = n-1 = 20-1 = 19

Q: The following dataset shows the AP History scores of 10 students: 3, 4, 3, 2, 3, 5, 2, 4, 1, 2 a)…

A: We have given that  Data : 3, 4, 3, 2, 3, 5, 2, 4, 1, 2 Sample size n = 10 I want to find mean and…

Q: 2) The principal randomly selected six students to take an aptitude test. Their scores were: 71.3…

A: We have given the data of test scores of randomly selected students to take an aptitude test.…

Q: Consider the following random sample from a normal population: 14,10,13,16,12,18,15, and 11. What is…

A: Here, x x-x (x-x)2 14 0.375 0.1406 10 -3.625 13.141 13 -0.625 0.3906 16 2.375 5.6406 12…

Q: nstruct a 99% confidence interval to estimate the average number of flights per day handled by the…

A: One sample t - interval is applicable here. ============================