Question

A study of the ages of motorcyclists killed in crashes involves the random selection of 132...

A study of the ages of motorcyclists killed in crashes involves the random selection of 132

drivers with a sample mean of 32.95 years. Assume that the population standard deviation is 9.4 years. a) Find the critical value zα /2 for a 94% confidence interval

b) Construct and interpret the 94% confidence interval estimate of the mean age of all motorcyclists killed in crashes. Use the z-table method.

c) Use TI84/83 calculator method.
d) Write a conclusion about the confidence interval.

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

Homework Answers

Answer #1

A.

= 1.881

B.

C.

Follow the below stop to calculate the confidence interval:

Press [STAT]->Calc->7. Z-interval [ENTER]

D.

Therefore, based on the data provided, the 94% confidence interval for the population mean is 31.411<μ<34.489, which indicates that we are 94% confident that the true population mean age of all motorcyclists killed in crashes is contained by the interval (31.411,34.489).

Please upvote if you have liked my answer, would be of great help. Thank you.

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
A study of the ages of motorcyclists killed in crashes involves the random selection of 149...
A study of the ages of motorcyclists killed in crashes involves the random selection of 149 drivers with a mean of 33.24years. Assuming that sigmaσequals=8.2 ​years, construct and interpret a 90​% confidence interval estimate of the mean age of all motorcyclists killed in crashes.
A study of the ages of motorcyclists killed in crashes involves the random selection of 143...
A study of the ages of motorcyclists killed in crashes involves the random selection of 143 drivers with a mean of 38.01 years. Assuming that sigmaequals8.8 ​years, construct and interpret a 99​% confidence interval estimate of the mean age of all motorcyclists killed in crashes.What is the 99​% confidence interval for the population mean u​?
Randomly selected statistics students of the author participated in an experiment to test their ability to...
Randomly selected statistics students of the author participated in an experiment to test their ability to determine when 60 seconds has passed. Forty students yielded a sample mean of 57.3 sec. Assume that the population standard deviation is σ = 8.5 sec. a) Find the critical value zα /2 for a 82% confidence interval b) Construct a 82% confidence interval estimate of the population mean of all statistics students. Use the z-table method. c) Use TI84/83 calculator method. d) Write...
The following data lists the ages of a random selection of actresses when they won an...
The following data lists the ages of a random selection of actresses when they won an award in the category of Best? Actress, along with the ages of actors when they won in the category of Best Actor. The ages are matched according to the year that the awards were presented. Complete parts? (a) and? (b) below. Actress(years) 31 31 31 32 36 28 29 40 31 35 Actor (years) 60 34 38 40 29 35 51 35 38 40...
The following data lists the ages of a random selection of actresses when they won an...
The following data lists the ages of a random selection of actresses when they won an award in the category of Best​ Actress, along with the ages of actors when they won in the category of Best Actor. The ages are matched according to the year that the awards were presented. Complete parts​ (a) and​ (b) below. Actress left parenthesis years right parenthesisActress (years) 2626 2727 3030 2626 3434 2424 2727 3838 3131 3333 Actor left parenthesis years right parenthesisActor...
Randomly selected 30 student cars have ages with a mean of 7 years and a standard...
Randomly selected 30 student cars have ages with a mean of 7 years and a standard deviation of 3.6 years, while randomly selected 23 faculty cars have ages with a mean of 5.9 years and a standard deviation of 3.5 years. 1. Use a 0.01 significance level to test the claim that student cars are older than faculty cars. (a) The test statistic is (b) The critical value is (c) Is there sufficient evidence to support the claim that student...
(1 point) Randomly selected 14 student cars have ages with a mean of 8 years and...
(1 point) Randomly selected 14 student cars have ages with a mean of 8 years and a standard deviation of 3.6 years, while randomly selected 19 faculty cars have ages with a mean of 6 years and a standard deviation of 3.3 years. 1. Use a 0.01 significance level to test the claim that student cars are older than faculty cars. (a) The test statistic is (b) The critical value is (c) Is there sufficient evidence to support the claim...
Randomly selected 130 student cars have ages with a mean of 7.9 years and a standard...
Randomly selected 130 student cars have ages with a mean of 7.9 years and a standard deviation of 3.4 years, while randomly selected 65 faculty cars have ages with a mean of 5.7 years and a standard deviation of 3.3 years. 1. Use a 0.02 significance level to test the claim that student cars are older than faculty cars. The test statistic is The critical value is Is there sufficient evidence to support the claim that student cars are older...
Randomly selected 17 student cars have ages with a mean of 7 years and a standard...
Randomly selected 17 student cars have ages with a mean of 7 years and a standard deviation of 3.6 years, while randomly selected 20 faculty cars have ages with a mean of 5.6 years and a standard deviation of 3.7 years. 1. Use a 0.05 significance level to test the claim that student cars are older than faculty cars. (a) The test statistic is (b) The critical value is (c) Is there sufficient evidence to support the claim that student...
A sample of 17 randomly selected student cars have ages with a mean of 7.8 years...
A sample of 17 randomly selected student cars have ages with a mean of 7.8 years and a standard deviation of 3.6 years, while a sample of 22 randomly selected faculty cars have ages with a mean of 5.6 years and a standard deviation of 3.3 years. 1. Use a 0.05 significance level to test the claim that student cars are older than faculty cars. (a) The test statistic is 1.9619 (b) The critical value is 1.688 (c) Is there...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT