You work for a marketing firm that has a large number of clients in the automobile in the industry. You have been asked to estimate the proportion of households in Chicago that have two or more vehicles. You have been assigned to gather a random sample that could be used to estimate this proportion to within a 0.015 margin of error at a 80% confidence level.  A) with no prior research what sample size should you gather in order to obtain a 0.015 margin of error? B) your firm has decided that your plan is too expensive. You conduct a small preliminary sample, and you obtain a sample proportion of p=0.235. Using this new information, what sample size should you gather in order to obtain a 0.015 margin of error?

Q: According to a poll, 81% of California adults (409 out of 506 surveyed) feel that education is one…

A: Point estimate=0.81

Q: According to a study conducted by a statistical organization, the proportion of people who are…

A: n=100 p=0.72 The objective is to solve the given questions based on a study conducted by a…

Q: We wish to estimate what per cent of 18 to 25-year old's that own a Samsung phone. Out of 400…

A:

Q: The following sample data are from a normal population: 10, 8, 12, 15, 13, 11, 6, 5. What is the…

A: Given data is10,8,12,15,13,11,6,5sample size(n)=8sample mean(x¯)=10standard…

Q: What is the purpose of finding a confidence interval for a proportion?

A: A true (or population) proportion (denoted as p), by definition, is essentially determined as the…

Q: A 20-minute consumer survey mailed to 500 adults aged 25 to 34 included a $5 Starbucks gift…

A:

Q: What would the p-value be for a sample if the test statistic is 0.968 and the significance level is…

A: Given data: Test statistics = 0.968 The test is assumed to be right tailed test. Significance level…

Q: have the same sample means but different confidence intervals. What are the implications for Dr.…

A: Dr. Richard's research study includes 3 fertilizers used for crop Fertilizer Mean, Crop Yield…

Q: The internal auditing staff of a local manufacturing company performs a sample audit each quarter to…

A:

Q: Suppose we want to test whether there is a difference between the room rates of luxury hotels in New…

A: It is given that 20 random luxury hotels in new York and 30 random luxury hotels in L.A.

Q: In statistics, what is a Confidence Interval and how confidence intervals are used in research

A: We have define the confidence interval . Also we have find the its use in the research

Q: The U.S. Department of Transportation, National Highway Traffic Safety Administration, reported that…

A: From the provided information, Sample size (n) = 54 Out of which 35 involved an intoxicated driver.…

Q: You conduct a one-way ANOVA with 7 groups (or populations). At 0.01 significance level, you find at…

A: Given:

Q: One personality test available on the World Wide Web has a subsection designed to assess the…

A: We have given that Mean(µ) = 140 Sample mean (x̅) = 134 Standard deviations (s) = 28

Q: 1.Community college students conduct a survey at their college. They ask "Do you plan to transfer to…

A: We have given that,  Favorable cases (X) = 80 and sample size (N) = 100 Then,  We will find the 94%…

Q: people in the age group 18-29 and 1500 people in the age group 30-55. The sample proportions of…

A: Given : Given : n1 = 1000 n2 = 1500 confidence level,c=0.95 Significance…

Q: A union of restaurant and foodservice workers would like to estimate the mean hourly wage, u, of…

A:

Q: Part 1 of 3: You are given the following numbers and want to estimate the population mean. 5.2, 18,…

A: Here, there are 6 observations. That is, n = 6. The sample mean and sample standard deviation are…

Q: According to a poll, 77% of California adults (389 out of 506 surveyed) feel that education is one…

A: Given that the number of favorable cases Favorable Cases XX = 389389 Sample Size NN = 506506…

Q: In a random sample of 315 people 90 of them were smokers. Based on the above sample test whether the…

A:

Q: A doctor would like to estimate the mean difference in the number of hours of sleep for seniors in…

A: Random sample of 50 high school seniors  Random sample of 50 seniors from the colleges in his county…

Q: What is the confidence interval? Select the correct choice below and, if necessary, fill in the…

A: Mean = 56.64 Standard deviation = 14.598 n=100

Q: You conduct a one-way ANOVA with 12 groups (or populations). At 0.05 significance level, you find…

A: Given :

Q: use a sample to draw an inference about a population

A: The population is a set of all the possible observations about a specified characteristic of…

Q: What are two ways to get a narrower confidence interval for a proportion?

A: Two ways to get a narrower confidence interval for a proportion are:

Q: You receive a brochure from a large university. The brochure indicates that the mean class size for​…

A: Sample size is, Population mean is Confidence Level is The objective is to test the claim that the…

Q: Provide a scenario for which you would use an independent sample t test. Also, explain in your own…

A: Introduction :-  Here we have to explain  Condition where independent sample t test can be applied…

Q: We wish to estimate what percent of 18 to 25-year old's that own a Samsung phone. Out of 400…

A: Solution: Let X be the number of adults own a Samsung phone and n be the sample number of adults.…

Q: A marketing agency wanted to determine if a new commercial changed people's opinion about a company.…

A: Statistical hypothesis means the decision about a population parameter. Here we look at the data we…

Q: 12. A newspaper article stated that the US Supreme Court received 812 letters from around the…

A: Normality condition: As expected number of success and expected number of failures increasing then…

Q: On February 20, 2018 nebnews.com ran a story titled "Poll: Support for gun control hits record…

A:

Q: Researchers are interested in the average heart rate of male college students. Assume a random…

A: Here, the sample proportion, p^ is 0.65 =130200 and the sample size, n  is 200. Using standard…

Q: Suppose we wanted to estimate the mean room rate for luxury hotels in the Northeast. Assume that the…

A: Given that Population standard deviation =$35 95 % confidence interval Margin of Error=$10  We have…

Q: PROBLEM: A psychologist asks a random sample of 30 female adolescents and a separate, random sample…

A: Given:   Case Female Male 1 5.2 5 2 4.5 4.4 3 6.4 6.4 4 4.5 4.9 5 8.1 3.6 6 5.6 5.1…

Q: A union of restaurant and foodservice workers would like to estimate this year's mean hourly wage,…

A: Statistical hypothesis testing is an important method in inferential statistics. It is used to test…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.