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10) A sample of 50 cars on a section of the interstate indicated that the average...
(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...
Exhibit 8-3 A random sample of 81 automobiles traveling on a section of an interstate showed...
Exhibit 8-3 A random sample of 81 automobiles traveling on a section of an interstate showed an average speed of 60 mph. The distribution of speeds of all cars on this section of highway is normally distributed, with a standard deviation of 13.5 mph. Refer to Exhibit 8-3. If the sample size was 25 (other factors remain unchanged), the interval for μ would _____. Group of answer choices become wider become zero become narrower not change
1. A random sample of 400 automobiles traveling on an interstate showed an average speed of...
1. A random sample of 400 automobiles traveling on an interstate showed an average speed of 100 mph. From past information, it is known that the standard deviation of the population is 45 mph. What is the confidence interval given a 90% confidence level? a) b) c) d) 95.6 < p < 104.4 96.3< 103.7 94.2 < u < 105.8 92.2 < u < 107.8
(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 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...
4. (12 pts) The speed limit on a highway is 70 miles per hour. A sample...
4. (12 pts) The speed limit on a highway is 70 miles per hour. A sample of 8 cars are clocked at 69 mph, with a sample standard deviation of 5 miles per hour. Can we say, with at least 90 percent confidence that the average speed on the road is above 65? tcale = tarit Can we be at least 90 percent confidence that the average speed >70?
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.
(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 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 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 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...
1. A random sample of 400 automobiles traveling on an interstate showed an average speed of 100 mph. From past information, it is known that the standard deviation of the population is 45 mph. What is the confidence interval given a 90% confidence level? a) b) c) d) 95.6 < p < 104.4 96.3< 103.7 94.2 < u < 105.8 92.2 < u < 107.8
(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 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...
4. (12 pts) The speed limit on a highway is 70 miles per hour. A sample of 8 cars are clocked at 69 mph, with a sample standard deviation of 5 miles per hour. Can we say, with at least 90 percent confidence that the average speed on the road is above 65? tcale = tarit Can we be at least 90 percent confidence that the average speed >70?
(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...
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