Q7. Driving speed is on the QEW is known to be normally distributed. Find a 94%...
Q7. Driving speed is on the QEW is known to be normally distributed. Find a 94% confidence interval of the driving speed if the sample of 100 drivers show a sample mean of 104 Km/hr with a standard deviation of 10kms/hr. Also, comment on a report that says the Average driving speed is 100 km/hr.
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Q7. Driving speed is on the QEW is known to be normally
distributed. Find a 94%...
25> Consider a variable known to be Normally distributed with unknown mean μ and known standard...
25> Consider a variable known to be Normally distributed with unknown mean μ and known standard deviation σ-10. (a) what would be the margin of error of a 95% confidence interval for the population mean based on a random sample size of 25? The multiplier for a z confidence interval with a 95% confidence level is the critical value z. 1.960. (Enter your answer rounded to three decimal places.) margin of error 25 (b) What would be the margin of...
The speeds of vehicles on a highway with speed limit 90 km/h are normally distributed with...
The speeds of vehicles on a highway with speed limit 90 km/h are normally distributed with mean 104 km/h and standard deviation 6 km/h. (Round your answers to two decimal places.) (a) What is the probability that a randomly chosen vehicle is traveling at a legal speed? _______ % (b) If police are instructed to ticket motorists driving 110 km/h or more, what percentage of motorist are targeted? _______ %
The lifetime of an expensive filament is known to be normally distributed, to an excellent approximation,...
The lifetime of an expensive filament is known to be normally distributed, to an excellent approximation, but no other prior information is available. A random sample of 5 filaments has a sample mean lifetime of 968 hours and sample standard deviation of 27 hours. Find a two-sided 95% confidence interval estimate for the true mean lifetime of the filament a
The speeds of vehicles on a highway with speed limit 110 km/h are normally distributed with...
The speeds of vehicles on a highway with speed limit 110 km/h are normally distributed with mean 123 km/h and standard deviation 5 km/h. (Round your answers to two decimal places.) (a) What is the probability that a randomly chosen vehicle is traveling at a legal speed? (b) If police are instructed to ticket motorists driving 135 km/h or more, what percentage of motorist are targeted?
1. A projectile is measured to have a speed of 5280 um/ms. What is this speed...
1. A projectile is measured to have a speed of 5280 um/ms. What is this speed in mi/hr? (1 km 0.62137 mi, 1 hr 3600 s) 2. The mean of a normally distributed population is 420 and the standard deviation is 42 What percent of the population is larger than 397? 3. A random subset consisting of 52, 9V batteries is tested from a shipment. The mean voltage of these batteries is found to be 9.631 V, with a sample...
2. Suppose that the amount of time teenagers spend working at part-time jobs is normally distributed...
2. Suppose that the amount of time teenagers spend working at part-time jobs is normally distributed with a standard deviation of 20 minutes. A random sample of 100 observations is drawn, and the sample mean computed as 120 minutes. Determine the 95% confidence interval estimate of the population mean.
The life in hours of a certain type of lightbulb is normally distributed with a known...
The life in hours of a certain type of lightbulb is normally distributed with a known standard deviation of 10 hours. A random sample of 15 lightbulbs has a sample mean life of 1000 hours. What would the 99% lower-confidence bound L on the mean life be, rounded to the nearest integer?
Suppose the speeds of vehicles traveling on a highway are normally distributed and have a known...
Suppose the speeds of vehicles traveling on a highway are normally distributed and have a known population standard deviation of 7 miles per hour and an unknown population mean. A random sample of 32 vehicles is taken and gives a sample mean of 64 miles per hour Find the margin of error for the confidence interval for the population mean with a 98% confidence level Z005 Z0.025 Z0.0 Z0.005 0.10 1.282 1.645 1.960 2.326 2.576 You may use a calculator...
Suppose scores of a standardized test are normally distributed and have a known population standard deviation...
Suppose scores of a standardized test are normally distributed and have a known population standard deviation of 8 points and an unknown population mean. A random sample of 25 scores is taken and gives a sample mean of 93 points. Find the margin of error for a confidence interval for the population mean with a 98% confidence level. z0.10 z0.05 z0.025 z0.01 z0.005 1.282 1.645 1.960 2.326 2.576 You may use a calculator or the common z values above. Round...
The life in hours of a 75-watt light bulb is known to be normally distributed with...
The life in hours of a 75-watt light bulb is known to be normally distributed with σ = 25 hours. Suppose that you wanted the total width of the two-sided confidence interval on the mean life to be six hours at 95% confidence. What sample size should be used?
25> Consider a variable known to be Normally distributed with unknown mean μ and known standard deviation σ-10. (a) what would be the margin of error of a 95% confidence interval for the population mean based on a random sample size of 25? The multiplier for a z confidence interval with a 95% confidence level is the critical value z. 1.960. (Enter your answer rounded to three decimal places.) margin of error 25 (b) What would be the margin of...
The lifetime of an expensive filament is known to be normally distributed, to an excellent approximation, but no other prior information is available. A random sample of 5 filaments has a sample mean lifetime of 968 hours and sample standard deviation of 27 hours. Find a two-sided 95% confidence interval estimate for the true mean lifetime of the filament a
The speeds of vehicles on a highway with speed limit 110 km/h are normally distributed with mean 123 km/h and standard deviation 5 km/h. (Round your answers to two decimal places.) (a) What is the probability that a randomly chosen vehicle is traveling at a legal speed? (b) If police are instructed to ticket motorists driving 135 km/h or more, what percentage of motorist are targeted?
1. A projectile is measured to have a speed of 5280 um/ms. What is this speed in mi/hr? (1 km 0.62137 mi, 1 hr 3600 s) 2. The mean of a normally distributed population is 420 and the standard deviation is 42 What percent of the population is larger than 397? 3. A random subset consisting of 52, 9V batteries is tested from a shipment. The mean voltage of these batteries is found to be 9.631 V, with a sample...
2. Suppose that the amount of time teenagers spend working at part-time jobs is normally distributed with a standard deviation of 20 minutes. A random sample of 100 observations is drawn, and the sample mean computed as 120 minutes. Determine the 95% confidence interval estimate of the population mean.
Suppose the speeds of vehicles traveling on a highway are normally distributed and have a known population standard deviation of 7 miles per hour and an unknown population mean. A random sample of 32 vehicles is taken and gives a sample mean of 64 miles per hour Find the margin of error for the confidence interval for the population mean with a 98% confidence level Z005 Z0.025 Z0.0 Z0.005 0.10 1.282 1.645 1.960 2.326 2.576 You may use a calculator...
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