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 to within 7 percent with a confidence of 95
percent? (Do not round intermediate calculations. Round up
your final answer to the next whole number.)
Number of observations
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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,...
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 60 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 5 points b. Based on the initial results, approximately how many observations would you require to estimate the actual percentage of idle time...
#470. Confidence Intervals A survey is carried out at a university to estimate the percentage of...
#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...
Problem 7-11 How many observations should a time study analyst plan for in an operation that has a standard deviation o...
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...
How many observations should a time study analyst plan for in an operation that has a...
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.)
The answer for number 74 plz. 73. A survey asked couples for the number of years...
The answer for number 74 plz.
73. A survey asked couples for the number of years they had known each other before their divorce. A preliminary random sample of 46 couples had a standard deviation of 4.346 years. How large a sample is needed to construct a 90 percent confidence interval for the mean time each couple knew each other before the divorce if the estimate is to be within .5 year of the actual time? 74. Using the data...
A survey is being planned to determine the mean amount of time corporation executives watch television....
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...
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.
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 0.02 margin of error and use a confidence level of 95%. 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.)
The state education commission wants to estimate the percentage of tenth grade students that have reading...
The state education commission wants to estimate the percentage of tenth grade students that have reading skills at or below the eighth grade level. In an earlier study, the population percentage was estimated to be 22%. How large a sample would be required in order to estimate the percentage of tenth graders reading at or below the eighth grade level at the 95% confidence level with an error of at most 2%? (Round your answer up to the next integer)...
Students in a statistics class are conducting a survey to estimate the mean pe numbers in...
Students in a statistics class are conducting a survey to estimate the mean pe numbers in the bones. number of units students at their college are enrolled in. The students collect a part es points random sample of 47 students. The mean of the sample is 12.3 units. The Part 2: 5 points sample has a standard deviation of 1.9 units. 20 points What is the 95% confidence interval for the average number of units that students in their college...
Confidence is 99 percent. Please help. Problem 7-15 A job in an insurance office involves telephone...
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 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 60 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 5 points b. Based on the initial results, approximately how many observations would you require to estimate the actual percentage of idle time...
#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...
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...
The answer for number 74 plz.
73. A survey asked couples for the number of years they had known each other before their divorce. A preliminary random sample of 46 couples had a standard deviation of 4.346 years. How large a sample is needed to construct a 90 percent confidence interval for the mean time each couple knew each other before the divorce if the estimate is to be within .5 year of the actual time? 74. Using the data...
The state education commission wants to estimate the percentage of tenth grade students that have reading skills at or below the eighth grade level. In an earlier study, the population percentage was estimated to be 22%. How large a sample would be required in order to estimate the percentage of tenth graders reading at or below the eighth grade level at the 95% confidence level with an error of at most 2%? (Round your answer up to the next integer)...
Students in a statistics class are conducting a survey to estimate the mean pe numbers in the bones. number of units students at their college are enrolled in. The students collect a part es points random sample of 47 students. The mean of the sample is 12.3 units. The Part 2: 5 points sample has a standard deviation of 1.9 units. 20 points What is the 95% confidence interval for the average number of units that students in their college...
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...
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