Hanging Toilet Paper: Suppose that you plan to take a random sample of hanging toilet paper rolls in your town, with the goal of estimating the proportions of rolls that are hung so that the paper comes out over the top, as opposed to coming out underneath. You want to determine how many rolls to sample for a 95% confidence interval to have a margin of error no larger than ±.06. The population standard deviation of rolls that are hung so the paper comes out over the top is .43. Determine the necessary sample size.

Q: The CDC collects biometric data on the US population. A sample of 39 US citizens' heights are…

A: Provided information is ; Sample size(n)= 39 Sample mean(x¯) = 63 Sample standard deviation(s) = 14…

Q: A random sample of 64 business students required an average of 100 minutes to complete a statistics…

A: Given that, Mean = 100 Standard deviation = 20 Sample size = 64 95% confidence level

Q: Suppose the NCES would like to re-do their study. If they want a 95% confidence interval with a…

A:

Q: 9.61 What is the difference between a null hypothesis, Ho, and an alternative hypothesis, H¡? 9.62…

A: Here we need to differentiate four terms in a pair i.e, null hypothesis and alternative hypothesis…

Q: The values listed below are waiting times (in minutes) of customers at two different banks. At Bank…

A: From the provided information, Sample size (n) = 10 Confidence level = 99% Level of significance (α)…

Q: A manager needs to know the proportion of employees who have insurance. He selects 200 employees and…

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Q: You want to purchase a house. The average cost for a random sample of 10 houses in the local area is…

A: Given,   Sample size = 10 Sample mean = 110000 Population standard deviation = 2000   Since the…

Q: You randomly select 20 cars of the same model that were sold at a car dealership and determine the…

A: Answer:- Given, Sample size, n = 20  Sample mean, X¯= 9.75  Sample standard deviation, S = 2.39…

Q: From a simple random sample of 400 of the 1,395 colleges in our population, it was found that…

A: Given : 1395 colleges in our population  Population Size (N) = 1395 400 colleges selected randomly…

Q: Suppose we want to estimate the average weight of an adult male in a certain county. A random…

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Q: services is shown below. What is the margin of error for a 95% confidence interval for the average…

A: It is given that Sample size n = 61 Sample mean = 7.50 Sample SD s = 1.84 The critical value of t at…

Q: A learn-to-type software program claims that it can improve your typing skills. To test the claim…

A: We make the following table for the difference from the given information  Typing Speeds (in Words…

Q: Intellectual development (Perry) scores were determined for 21 students in a first-year,…

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Q: Neiman Marcus, a high end retailer, is interested in an opening a shop in Little Rock. Before they…

A: From the provided information, Sample size (n) = 100 Sample mean (x̄) = 50000 Standard deviation (s)…

Q: 2. A random sample of 85 group leaders, supervisors, and similar personal revealed that a person…

A: Introduction: The approach to determining the population distribution average is by utilizing a…

Q: you plan to dive to san antonio from college station to visit your friend lupita. that friend is…

A: The summary of statistics is, The degree of freedom is,

Q: The standard deviation for the amount of trash that Americans generate per day is 1.3 pounds. You…

A: The normal distribution is symmetric in nature having parameters μ and σ.The mean, mode, and median…

Q: Sales of trumpets in a day is modeled as Normal. A random sample of 36 days is looked at. The sample…

A:

Q: About 130,000 high school students took the AP Statistics exam in 2010. The free-response section of…

A: We have to find confidence interval for given data..

Q: The Statistics Games are played by a large number of teams across the county. Teams raise money to…

A: We have given that,  Sample mean (x̄) = $ 375, standard deviation (s) = $ 32 and sample size (n) =…

Q: A random sample of 64 business students required an average of 50.7 minutes to complete a statistics…

A: Margin of Error E = z(alpha/2) * s / sqrt(n)Lower Bound = X - z(alpha/2) * s / sqrt(n)Upper Bound =…

Q: igh school soccer league there are a total of 256 players.

A: Given that Total players in high school soccer league (n) = 256 players The mean height of the…

Q: 7 out of 70 students said they were comfortable with “working in a workplace with a lot of…

A: Given that  57 out of 70 students said they were comfortable with “working in a workplace with a lot…

Q: For a 95% confidence interval, what value will you use for t*? Group of answer choices 1.960 2.030…

A: There are two types of houses, houses with a view of a nearby lake and houses with no view of the…

Q: A learn-to-type software program claims that it can improve your typing skills. To test the claim…

A: Before After 52 47 44 42 40 46 50 43 46 34 38 50

Q: Sam computed a 90% confidence interval for mean from a specific random sample size n. He claims that…

A: Given Information: Sam computed a 90% confidence interval for mean from a specific random sample of…

Q: In a random survey of 510 college students, 342 indicated that they have student loan debt.  A…

A: It is given that a random survey of 510 college students, 342 indicated that they have student loan…

Q: Suppose we know that a confidence interval for a population proportion is (0.572, 0.662), with a…

A:

Q: Suppose that the true population standard deviation (this assumption is made only for this question,…

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Q: Suppose you are interested in studying regional differences in crime rates. You take a random…

A:

Q: A researcher wants to estimate the average amount of money a person spends on buying lottery tickets…

A: Given: Let X be the amount of money a person spends on buying lottery tickets each week Sample size…

Q: company manufactures a certain over-the-counter drug. The company samples 80 pills and finds that…

A: We have given that  Sample size n = 80 Sample mean = 325.5 Standard deviation s=10.3 90%confidence…

Q: Suppose we want a 99% confidence interval for the average amount spent on books by freshmen in their…

A: Standard Deviation = σ = 31 Margin of Error = E = 3 Confidence Level = 99 Significance Level =…

Q: Insurance Company A claims that its customers pay less for car insurance, on average than customers…

A: Formula :  test statistic for equal variance t test is

Q: Insurance Company A claims that its customers pay less for car insurance, on average, than customers…

A: For the people who buy insurance from Company A,Sample size, Mean, Sd, For the people who buy…

Q: Collette is self-employed, selling items at Home Interior parties. She wants to estimate the average…

A: Given: Sample size (n) = 35 Sample mean x¯=34.70 Population standard deviation σ=4.85 Confidence…

Q: researchers are concerned about the impact of students working while they are enrolled in classes,…

A: It is given that sample mean is 7.1 hours and the standard deviation is 5 hours.

Q: Assume that you have a normally distributed variable with known standard variance. How many standard…

A: We have given a normally distributed variable with known standard variance.Confidence level (c) =…

Q: Intellectual development (Perry) scores were determined for 21 students in a first-year,…

A: Given data :  n = 21 Average  students  = 3.27 SD = 0.40 9% of CI

Q: You want to conduct a study to estimate the percentage of robberies in Texas that result in arrests.…

A: From the provided information,Margin of error (E) = 0.04Confidence level = 80%As proportion estimate…