The Highway Safety Department wants to study the driving habits of individuals. A sample of 81...
The Highway Safety Department wants to study the driving habits of individuals. A sample of 81 cars traveling on the highway revealed an average speed of 67 miles per hour with a standard deviation of 9 miles per hour. The confidence interval found out to be 64.36 to 69.64. What is the correct interpretation of the 95% CI?
A. The highway speed is between 64.36 to 69.64 mph 95% of the time.
B. We are 95% confident that speed on highway for all cars is between 64.36 to 69.64 mph.
C. 95% of all cars have a speed between 64.36 to 69.64 mph on highway.
D. We are 95% confident that average speed on highway for all cars is between 64.36 to 69.64 mph.
E. The highway average speed is between 64.36 to 69.64 mph 95% of the time.
Homework Answers
D. We are 95% confident that average speed on highway for all cars is between 64.36 to 69.64 mph.
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The Highway Safety Department wants to study the driving habits
of individuals. A sample of 81...
The Highway Safety Department wants to study the driving habits of individuals. A sample of 81...
The Highway Safety Department wants to study the driving habits of individuals. A sample of 81 cars traveling on the highway revealed an average speed of 67 miles per hour with a standard deviation of 9 miles per hour. a. Compute the standard error of the mean. b. Determine a 99% confidence interval estimate for the speed of all cars.
(3 points) The Highway Safety Department wants to study the driving habits of individuals. A sample...
(3 points) The Highway Safety Department wants to study the
driving habits of individuals. A sample of 28 cars traveling on a
particular stretch of highway revealed an average speed of 69.9
miles per hour with a standard deviation of 4.2 miles per hour.
Round to 4 decimal places.
1.Calculate a 95% confidence interval for the true mean speed of
all cars on this particular stretch of highway.
( , )
2. What sample size is needed to estimate the...
(3 points) The Highway Safety Department wants to study the driving habits of individuals. A sample...
(3 points) The Highway Safety Department wants to study the driving habits of individuals. A sample of 30 cars traveling on a particular stretch of highway revealed an average speed of 66.1 miles per hour with a standard deviation of 8.5 miles per hour. Round to 4 decimal places. 1.Calculate a 95% confidence interval for the true mean speed of all cars on this particular stretch of highway. 2. What sample size is needed to estimate the true average speed...
(3 points) The Highway Safety Department wants to study the driving habits of individuals. A sample...
(3 points) The Highway Safety Department wants to study the driving habits of individuals. A sample of 43 cars traveling on a particular stretch of highway revealed an average speed of 66 miles per hour with a standard deviation of 3.6 miles per hour. Round to 4 decimal places. 1. Calculate a 95% confidence interval for the true mean speed of all cars on this particular stretch of highway. (64.892 ,67.108 ) 2. What sample size is needed to estimate...
(5 points) The Highway Safety Department wants to study the driving habits of individuals. A sample...
(5 points) The Highway Safety Department wants to study the driving habits of individuals. A sample of 38 cars traveling on a particular stretch of highway revealed an average speed of 68.9 miles per hour with a standard deviation of 5.9 miles per hour. Round to 4 decimal places. 1.Calculate a 99% confidence interval for the true mean speed of all cars on this particular stretch of highway. ( , ) 2. Based on the confidence interval do you think...
(3 points) The Highway Safety Department wants to study the driving habits of individuals. A sample...
(3 points) The Highway Safety Department wants to study the driving habits of individuals. A sample of 43 cars traveling on a particular stretch of highway revealed an average speed of 67.7 miles per hour with a standard deviation of 7.2 miles per hour. Round to 4 decimal places. 1.Calculate a 90% confidence interval for the true mean speed of all cars on this particular stretch of highway. 2. What sample size is needed to estimate the true average speed...
(3 points) The Highway Safety Department wants to study the driving habits of individuals. A sample...
(3 points) The Highway Safety Department wants to study the driving habits of individuals. A sample of 49 cars traveling on a particular stretch of highway revealed an average speed of 68.7 miles per hour with a standard deviation of 9.8 miles per hour. Round to 4 decimal places. 1.Calculate a 99% confidence interval for the true mean speed of all cars on this particular stretch of highway. ( , ) 2. What sample size is needed to estimate the...
(3 points) The Highway Safety Department wants to study the driving habits of individuals. A sample...
(3 points) The Highway Safety Department wants to study the driving habits of individuals. A sample of 43 cars traveling on a particular stretch of highway revealed an average speed of 67.7 miles per hour with a standard deviation of 10 miles per hour. Round to 4 decimal places. 1. Calculate a 90% confidence interval for the true mean speed of all cars on this particular stretch of highway. (65.135 , 70.265 ) 2. What sample size is needed to...
HW09: Problem 3 Problem Value: 3 point(s). Problem Score: 0%. Attempts Remaining: 3 attempts. (3 points) The Highway Sa...
HW09: Problem 3 Problem Value: 3 point(s). Problem Score: 0%. Attempts Remaining: 3 attempts. (3 points) The Highway Safety Department wants to study the driving habits of individuals. A sample of 26 cars traveling on a particular stretch of highway revealed an average speed of 67.3 miles per hour with a standard deviation of 6.1 miles per hour. Round to 4 decimal places. 1.Calculate a 99% confidence interval for the true mean speed of all cars on this particular stretch...
51. Safety research Under ideal conditions, if a person driving a car slams on the brakes and ski...
51. Safety research Under ideal conditions, if a person driving a car slams on the brakes and skids to a stop, the length of the skid marks (in feet) is given by the formula L0.000 013 3xy2 where x is the weight of the car (in pounds) and y is the speed of the car (in miles per hour). What is the average length of the skid marks for cars weighing between 2,000 and 3,000 pounds and traveling at speeds...
(3 points) The Highway Safety Department wants to study the
driving habits of individuals. A sample of 28 cars traveling on a
particular stretch of highway revealed an average speed of 69.9
miles per hour with a standard deviation of 4.2 miles per hour.
Round to 4 decimal places.
1.Calculate a 95% confidence interval for the true mean speed of
all cars on this particular stretch of highway.
( , )
2. What sample size is needed to estimate the...
(3 points) The Highway Safety Department wants to study the driving habits of individuals. A sample of 30 cars traveling on a particular stretch of highway revealed an average speed of 66.1 miles per hour with a standard deviation of 8.5 miles per hour. Round to 4 decimal places. 1.Calculate a 95% confidence interval for the true mean speed of all cars on this particular stretch of highway. 2. What sample size is needed to estimate the true average speed...
(3 points) The Highway Safety Department wants to study the driving habits of individuals. A sample of 43 cars traveling on a particular stretch of highway revealed an average speed of 66 miles per hour with a standard deviation of 3.6 miles per hour. Round to 4 decimal places. 1. Calculate a 95% confidence interval for the true mean speed of all cars on this particular stretch of highway. (64.892 ,67.108 ) 2. What sample size is needed to estimate...
(3 points) The Highway Safety Department wants to study the driving habits of individuals. A sample of 43 cars traveling on a particular stretch of highway revealed an average speed of 67.7 miles per hour with a standard deviation of 7.2 miles per hour. Round to 4 decimal places. 1.Calculate a 90% confidence interval for the true mean speed of all cars on this particular stretch of highway. 2. What sample size is needed to estimate the true average speed...
(3 points) The Highway Safety Department wants to study the driving habits of individuals. A sample of 43 cars traveling on a particular stretch of highway revealed an average speed of 67.7 miles per hour with a standard deviation of 10 miles per hour. Round to 4 decimal places. 1. Calculate a 90% confidence interval for the true mean speed of all cars on this particular stretch of highway. (65.135 , 70.265 ) 2. What sample size is needed to...
HW09: Problem 3 Problem Value: 3 point(s). Problem Score: 0%. Attempts Remaining: 3 attempts. (3 points) The Highway Safety Department wants to study the driving habits of individuals. A sample of 26 cars traveling on a particular stretch of highway revealed an average speed of 67.3 miles per hour with a standard deviation of 6.1 miles per hour. Round to 4 decimal places. 1.Calculate a 99% confidence interval for the true mean speed of all cars on this particular stretch...
51. Safety research Under ideal conditions, if a person driving a car slams on the brakes and skids to a stop, the length of the skid marks (in feet) is given by the formula L0.000 013 3xy2 where x is the weight of the car (in pounds) and y is the speed of the car (in miles per hour). What is the average length of the skid marks for cars weighing between 2,000 and 3,000 pounds and traveling at speeds...
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