See attached file for full problem description. 16. A study of 305 computer chips found that 244 chips functioned properly. Develop a 99 percent confidence interval for the population proportion of properly functioning computer chips. 17. A correctional institution would like to report the mean amount of money spent per d
You plan to conduct a survey to find what proportion of the workforce has two or more jobs. You decide on the 95 percent confidence level and state that the estimated proportion must be within 2 percent of the population proportion. A pilot survey reveals that 5 of the 50 sampled hold two or more jobs. How many in the workforce
**RELEVANT DEPENDENT AND INDEPENDENT VARIABLES **SAMPLE SIZE DETERMINATION AND SURVEY INSTRUMENTS Please help with the following. Team B's proposal paper: ABC Company, a large grocery retailer located on the east coast, is experiencing a significant reduction in employees furthering their education and earning advanced
A well known bank credit card firm wishes to estimate the proportion of credit card holders who carry a nonzero balance at the end of the month and incur and interest charge. Assume that the desired margin of error is .03 at 98% confidence. (a) How large a sample should be selected if it is anticipated that roughly 70% of th
Find the appropriate minimum sample size: You want to be 95% confident that the sample variance is within 40% of the population variance. Sample size must be an integer.
Find the minimum sample size you should use to assure that your estimate of p-hat will be within the required margin of error around the population p: margin of error = 0.001, confidence level = 92%, p-hat and q-hat are unknown.
What are the elements that affect determination of sample size?
Bea asks Brian the sample size and the timeframe. Brian responds, 140,000 Suppose the bank has one million customers in the USA (where the survey is conducted) With a 95% confidence level and a margin of error of 3%, what would you recommend the minimum sample size to be? This is the minimum sample size. In practi
The Democrat and Chronicle reported that 25% of the flights arriving at the San Diego airport during the first five months of 2001 were late (Democrat and Chronicle, July 23, 2001). Assume the population proportion is p = .25 a. Show the sampling distribution of p, the proportion of late flights in a sample of 1000 flights.
The standard error of the mean for a sample of 100 is 30. In order to manipulate the standard error of the mean to be 15, we would: A. increase the sample size to 200 B. increase the sample size to 400 C. decrease the sample size to 50 D. decrease the sample size to 25.
A) A nutritionist wants to estimate the mean amount of cholesterol in a certain variety of chicken eggs. She wants to be within 14 mg. with 99% confidence. It is believed that the standard deviation is 25 mg. How large a sample of eggs should she use? B) A nurseryman wants to estimate how many poinsettias he will need for Ch
Why is it important to determine an appropriate sample size and how can you determine what sample size you should use to ensure that your population mean (mu) is within your confidence interval?
A sample of 12 homes sold last week in St. Paul, Minnesota, is selected. Can we conclude that as the size of the home (reported below in thousands of square feet) increases, the selling price (reported in $ thousands) also increases? Home Size Selling (thousands Price of square feet) ($ thousands)
Problem (see attached): 1) An Entomologist wishes to estimate the average development time of the citrus red mite correct to within .5 day. From previous experiments it is known that standard deviation is in the neighborhood of 4 days. How large a sample should the entomologist take to be 95% confident of her estimate.
Using the large database of survey responses (this is your sample - see attached), you will begin testing hypotheses. Complete the following: 6. Determine the required sample size if you need to estimate the number of workers in the United States who are highly satisfied with their job and you want the estimate to be within
Assume the following data represent a population of 50 values. Values equal to 1 indicate that a particular attribute is present, a value equal to 0 indicates the attribute is not present. 1 1 1 1 1 1 1 1 0 0 0 1 1 0 0 1 1 1 0 1 0 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 0 1 1 0 1 1 1 1 1 1 1 1 1 a. Compute the population pro
The house of representatives has a very controversial bill that will be going to vote. To help formulate his strategy on how to get the bill passed, the chairman of the committee that has been studying the bill wishes to know if there is a division between Democrats and Republicans on the issue or if there is some other basis fo
Z= .49 confidence level e= 10.00 desired margin of error 0= 500 population standard deviation I can't make the Greek letter for the last one so I used o which is the close to the o with a line I need to know what the sample size will be with this information.
Question: Hockey-r-us" a store specializing in sales of hockey equipment, wants to find out the average age of all it's customers. A random sample 25 customers reveals an average age of 38 years, with a standard deviation of six years. How large of a sample should be constructed to be 90% confident that the sampling error is o
In an election campaign, the party vying for an upset polls a sample of 100 voters. The party finds that 60 of 100 clearly express the intention of voting in favour of the party polling. How many voters should be sampled if the party wants to estimate the population proportion with a sampling error of 5% or less? (Use confidence
Executives of a supermarket chain are interested in the amount of time that customers spend in the stores during shopping trips. The executives hire a statistical consultant and ask her to determine the mean shopping time of customers at the supermarkets. The consultant will collect a random sample of shopping times at the super
Suppose that a researcher is interested in estimating the mean systolic blood pressure of executives of major corporations. He plans to use the blood pressures of a random sample of executives of major corporations to estimate the population mean. Assuming that the standard deviation of the population of systolic blood pressures
A coin-operated coffee machine made by BIG Corporation was designed to discharge a mean of eight ounces of coffee per cup. If it dispenses more that that on average, the corporation may lose money, and if it dispenses less, the customers may complain. BIG Corporation would like to estimate the mean amount of coffee dispensed
A consumer advocacy group is doing a large study on car rental practices. Among other things, the consumer group would like to estimate the mean monthly mileage of cars rented in the U.S. over the past year. The consumer group plans to choose a random sample of monthly U.S. rental car mileages and then estimate using the mean o
A personality test has a subsection designed to assess the "honesty" of the test-taker. Suppose that you're interested in the mean score, mu, on this subsection among the general population. You decide that you'll use the mean of a random sample of scores on this subsection to estimate mu. What is the minimum sample size needed
A coin-operated coffee machine made by BIG Corporation was designed to discharge a mean of eight ounces of coffee per cup. If it dispenses more that that on average, the corporation may lose money, and if it dispenses less, the customers may complain. BIG Corporation would like to estimate the mean amount of coffee, M , disp
Assume the following data represent a population of 50 values. Values equal to 1 indicate that a particular attribute is present, a value equal to 0 indicates the attribute is not present. 1 1 1 1 1 1 1 1 0 0 0 1 1 0 0 1 1 1 0 1 0 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 0 1 1 0 1 1 1 1 1 1 1 1 1 a. How would you compute the popu
Question 4 (20 Points): A marketing survey is to be planned to estimate the proportion of all customers who would subscribe to a new pay-per-view service that a cable TV plans to offer. The sample size for the survey is to be decided to estimate this proportion within a margin of error 2 percentage of points using a 95% confiden
A survey of shoppers is planned to determine what percentage use credit cards. Prior surveys suggest that 59% use credit cards. The required margin of error is 0.02 at 95% confidence. What is the minimum sample size required to assure that your sample proportion "p" will be within the required margin of error, around the popul
A survey of shoppers is planned to determine what percentage use credit cards. Prior surveys suggest that 59% use credit cards. The required margin of error is 0.02 at 95% confidence. What is the minimum sample size required to assure that your sample proportion "p" will be within the required margin of error around the popul