Question

The traffic commissioner wants to know the average speed of all vehicles driving on River Rd....

The traffic commissioner wants to know the average speed of all vehicles driving on River Rd. Police use radar to observe the speeds for a sample of 20 vehicles on River Rd.

For the vehicles in the sample, the average speed is 31.3 miles per hour with standard deviation 7.0 mph.

Construct and interpret a 98% confidence interval estimate of the true population average speed of all vehicles on River Rd. Use a 98% confidence level.

X = ________________________________________________________________________

population parameter:  = ________________________________________________________________

random variable X = ____________________________________________________________________ We are

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

Conclusion:- we are 98% confidence that population average speed of all vehicles on River Rd is between 9.3258 to 17.2742.

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Police recorded the average speed of cars driving on a busy street by a school. For...
Police recorded the average speed of cars driving on a busy street by a school. For a sample of 36 ​speeds, it was determined that the average amount over the speed limit for the 36 speeds was 12.3 mph with a standard deviation of 9 mph. The 95 ​% confidence interval estimate for this sample is 9.25 mph to 15.35 mph. ​a) What is the margin of error for this​ problem? ​b) What size sample is needed to reduce the...
The Newark Police Department is attempting to estimate the average rate of speed on Broad Street...
The Newark Police Department is attempting to estimate the average rate of speed on Broad Street after 8:00 PM. With hidden radar, the speed of a random selection of 25 vehicles was measured, which yielded a sample mean of 42 mph and a standard deviation of 6 mph. a. Estimate the standard error of the mean. b. Using the same data, estimate the 95% and 99% confidence intervals for the sample mean
USDOT wants to know if drivers are driving faster than the posted speed limit of 65...
USDOT wants to know if drivers are driving faster than the posted speed limit of 65 miles per hour. The speeds of a sample of randomly selected drivers are compared to 65 mph limit. The appropriate test to see if drivers are exceeding 65 would be a: a. One sample t-test. b. Independent samples t-test. c. Matched (or dependent) paired samples t-test. d. A one-way chi-square.
Chief Grady wants to know whether the mean speed of vehicles on a particular stretch of...
Chief Grady wants to know whether the mean speed of vehicles on a particular stretch of Pat Bay Highway exceeds the posted speed limit of 90 km per hour. He has a sample of 35 car speeds with a mean speed of 93 km per hour and a sample standard deviation of 4 km per hour. Chief Grady wishes to estimate the true mean speed of all vehicles passing this stretch of Pat Bay Highway using a 95% confidence interval....
A tire company wants to know how long a tire lasts on average. Suppose they know...
A tire company wants to know how long a tire lasts on average. Suppose they know that the population variance for tire life is 1,000,000.  A sample of 400 tires yields the average life of tire as 27,000 miles.             Construct and interpret a 98% confidence interval for population mean.   
The Highway Safety Department wants to study the driving habits of individuals. A sample of 40...
The Highway Safety Department wants to study the driving habits of individuals. A sample of 40 cars traveling on a particular stretch of highway revealed an average speed of 69.9 miles per hour with a standard deviation of 5.8 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...
The Highway Safety Department wants to study the driving habits of individuals. A sample of 40...
The Highway Safety Department wants to study the driving habits of individuals. A sample of 40 cars traveling on a particular stretch of highway revealed an average speed of 69.9 miles per hour with a standard deviation of 5.8 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...
The National Highway Traffic Safety Administration indicated that 284 people died between 1990 and 2007 as...
The National Highway Traffic Safety Administration indicated that 284 people died between 1990 and 2007 as a result of an injury caused by an airbag. Newer airbags open at a speed proportional to the speed of an impact. Older models open at a constant speed, up to 200mph, equal to the force of a heavyweight knockout punch. A random sample of 40 older-model airbags was obtained and tested. The average opening speed for each older-model airbag was 173.88. Airbag opening...
1. Let z denote a random variable having a normal distribution with μ = 0 and...
1. Let z denote a random variable having a normal distribution with μ = 0 and σ = 1. Determine each of the following probabilities. (Round all answers to four decimal places.) (c) P(0.40 < z < 0.85) = (d) P(−0.85 < z < −0.40) = (e) P(−0.40 < z < 0.85) = 2. Three friends (A, B, and C) will participate in a round-robin tournament in which each one plays both of the others. Suppose that P(A beats B)...
Do all the following problems. I. Choose the best answer for each multiple choice. Please use...
Do all the following problems. I. Choose the best answer for each multiple choice. Please use CAPITAL letters to indicate your answer and write neatly. (30 points) 1. ____ 4.____ 7. ____ 10.____ 13. ____ 2. ____ 5.____ 8. ____ 11.____ 14. ____ 3. ____ 6.____ 9. ____ 12.____ 15. ____ Whenever the population standard deviation is unknown and the population has a normal or near-normal distribution, which distribution is used in developing an interval estimation? A. standard distribution B....
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT