A laptop manufacturer finds that the average time it takes an employee to load a laptop...
A laptop manufacturer finds that the average time it takes an employee to load a laptop with software is 30 minutes with a standard deviation 7 minutes. Suppose you take a random sample of 81 employees. The standard deviation of the sample mean is:
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A laptop manufacturer finds that the average time it takes an
employee to load a laptop...
company that manufactures bookcases finds that the average time it takes an employee to build a...
company that manufactures bookcases finds that the average time it takes an employee to build a bookcase is 10hours with a standard deviation of 3 hours. A random sample of 64 employees is taken. What is the likelihood that the sample mean will be 11 hours or more?
A manufacturer of power tools claims that the average amount of time required to assemble their...
A manufacturer of power tools claims that the average amount of time required to assemble their top-of-the-line table saw is 80 minutes with a standard deviation of 40 minutes. Suppose a random sample of 64 purchasers of this table saw is taken. The probability that the sample mean will be greater than 88 minutes is __________. What type of problem is this? Poisson Random variable Sample mean Sample proportion Normal
A manufacturer of power tools claims that the average amount of time required to assemble their...
A manufacturer of power tools claims that the average amount of time required to assemble their top-of-the-line table saw is 80 minutes with a standard deviation of 40 minutes. Suppose a random sample of 64 purchasers of this table saw is taken. The probability that the sample mean will be greater than 88 minutes is __________. You should use the finite population correction factor for this problem. True False
A manufacturer of power tools claims that the average amount of time required to assemble their...
A manufacturer of power tools claims that the average amount of time required to assemble their top-of-the-line table saw is 80 minutes with a standard deviation of 40 minutes. Suppose a random sample of 64 purchasers of this table saw is taken. The probability that the sample mean will be greater than 88 minutes is __________. Which parameters in the problem do the data values (80, 40, 64, 88) represent?
A car manufacturer has determined it takes an average time of 58 minutes to produce a...
A car manufacturer has determined it takes an average time of 58 minutes to produce a car. The population standard deviation is assumed to be 7 minutes. The company pays a bonus to the workers for every car produced in 49 minutes or less. Assuming that the production time is normally distributed, answer the following questions. Let X = production time of a randomly selected car. (Round all probabilities to four decimals and times to two decimals) a) What is...
A car manufacturer has determined it takes an average time of 51 minutes to produce a...
A car manufacturer has determined it takes an average time of 51 minutes to produce a car. The population standard deviation is assumed to be 7 minutes. The company pays a bonus to the workers for every car produced in 43 minutes or less. Assuming that the production time is normally distributed, answer the following questions. Let X- production time of a randomly selected car. (Round probabilities to four decimals and times to two decimals.) a) What is the probability...
The owner of an oil change shop would like to know the mean time it takes...
The owner of an oil change shop would like to know the mean time it takes to do an oil change at the shop. He takes a random sample of 16 cars that are serviced and finds a sample average of 20.5 minutes and a standard deviation of 7.4 minutes Construct a 90% confidence interval for the true mean time to do an oil change to a car. a) Lower Bound b) Upper Bound
A car manufacturer has determined it takes an average time of 53 minutes to produce a...
A car manufacturer has determined it takes an average time of 53 minutes to produce a car. The population standard deviation is assumed to be 7 minutes. The company pays a bonus to the workers for every car produced in 45 minutes or less. Assuming that the production time is normally distributed, answer the following questions. Let X = production time of a randomly selected car. (Round probabilities to four decimals and times to two decimals.) a) What is the...
An employee group for a retailer claims that the mean time spent by employees on a...
An employee group for a retailer claims that the mean time spent by employees on a personal phone call is less than 10 minutes per day. A random sample of 25 employees is taken and showed a mean of 9.2 minutes and a standard deviation of 2 minutes. Test the claim with a 5% significance level the time is less than 10 minutes.
An inexperienced on-line instructor would like to estimate the mean time that it takes her students...
An inexperienced on-line instructor would like to estimate the mean time that it takes her students to complete one of her tests. She takes a random sample of 30 test times and finds that the mean in the sample is 36 minutes with a standard deviation in the sample of 3 minutes. Which of the following would be the appropriate calculation for constructing a 98% confidence interval to estimate the mean test time for all of her students? 2.34.726 <u...
A car manufacturer has determined it takes an average time of 51 minutes to produce a car. The population standard deviation is assumed to be 7 minutes. The company pays a bonus to the workers for every car produced in 43 minutes or less. Assuming that the production time is normally distributed, answer the following questions. Let X- production time of a randomly selected car. (Round probabilities to four decimals and times to two decimals.) a) What is the probability...
An employee group for a retailer claims that the mean time spent by employees on a personal phone call is less than 10 minutes per day. A random sample of 25 employees is taken and showed a mean of 9.2 minutes and a standard deviation of 2 minutes. Test the claim with a 5% significance level the time is less than 10 minutes.
An inexperienced on-line instructor would like to estimate the mean time that it takes her students to complete one of her tests. She takes a random sample of 30 test times and finds that the mean in the sample is 36 minutes with a standard deviation in the sample of 3 minutes. Which of the following would be the appropriate calculation for constructing a 98% confidence interval to estimate the mean test time for all of her students? 2.34.726 <u...
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