In an initial survey designed to estimate the percentage of time air-express cargo loaders are idle,...
In an initial survey designed to estimate the percentage of time air-express cargo loaders are idle, an analyst found that loaders were idle in 8 of the 45 observations. a. What is the estimated percentage of idle time? (Round your answer to 2 decimal places. Omit the "%" sign in your response.) Estimated percentage of idle time % b. Based on the initial results, approximately how many observations would you require to estimate the actual percentage of idle time...
Problem 7-11 How many observations should a time study analyst plan for in an operation that has a standard deviation of 1.4 minutes per piece if the goal is to estimate the mean time per piece to within .3 minute with a confidence of 95.5 percent? (Do not round intermediate calculations. Round up your final answer to the next whole number.) Number of observations
Problem 7-11 How many observations should a time study analyst plan for in an operation that...
#470. Confidence Intervals A survey is carried out at a university to estimate the percentage of undergraduate students who drive to campus to attend classes. If the SD of the population was 25%, then how many people would we need to poll to get a 90% confidence interval with a 2% margin of error? Remember that our answer is about actual people -- to answer this question you must round number to your up the nearest whole number (if you...
How many observations should a time study analyst plan for in an operation that has a standard deviation of 1.8 minutes per piece if the goal is to estimate the mean time per piece to within .4 minute with a confidence of 95.5 percent? (Do not round intermediate calculations. Round up your final answer to the next whole number.)
Confidence is 99 percent. Please help.
Problem 7-15 A job in an insurance office involves telephone conversations with policyholders. The office manager estimates that about half of the employee's time is spent on the telephone. How many observations are needed in a work sampling study to estimate that time percentage to within 7 percent and have a confidence of 990 percent? (Round z values to 2 decimal places. Do not round other intermediate calculations. Round your final answer to the...
In a study of government financial aid for college students, it becomes necessary to estimate the percentage of full-time college students who earn a bachelor's degree in four years or less. Find the sample size needed to estimate that percentage. Use a 0.05 margin of error and use a confidence level of 90%. Complete parts (a) through (c) below. a. Assume that nothing is known about the percentage to be estimated. n= (Round up to the nearest integer.) b. Assume prior studies...
A job in an insurance office involves telephone conversations with policyholders. The office manager estimates that about half of the employee's time is spent on the telephone. How many observations are needed in a work sampling study to estimate that time percentage to within 6 percent and have a confidence of 95.5 percent? (Round z values to 2 decimal places. Do not round other intermediate calculations. Round your final answer to the nearest whole number.) Number of observations
A survey is being planned to determine the mean amount of time corporation executives watch television. A pilot survey indicated that the mean time per week is 12 hours, with a standard deviation of 3.5 hours. It is desired to estimate the mean viewing time within one-quarter hour. The 90% level of confidence is to be used. How many executives should be surveyed? (Round your z-score to 2 decimal places and round your final answer to the next whole number.)
A survey is being planned to determine the mean amount of time corporation executives watch television. A pilot survey indicated that the mean time per week is 13 hours, with a standard deviation of 2.0 hours. It is desired to estimate the mean viewing time within one-quarter hour. The 95% level of confidence is to be used. (Use z Distribution Table.) How many executives should be surveyed? (Round your z-score to 2 decimal places and round up your final answer...
1). The Fox TV network is considering replacing one of its prime-time crime investigation shows with a new family-oriented comedy show. Before a final decision is made, network executives commission a sample of 500 viewers. After viewing the shows, 150 indicated they would watch the new show and suggested it replace the crime investigation show. Estimate the value of the population proportion. (Round your answers to 3 decimal places.) Develop a 90% confidence interval for the population proportion. (Round your...