ZuoTi.Pro
Question

30 people are selected randomly from a certain town. If their mean age is 32.2 and...

30 people are selected randomly from a certain town. If their mean age is 32.2 and standard deviation is 8.5,find a 95% confidence interval for the true mean age ,u, of everyone in the town

math   Statistics-And-Probability   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Answer #1

0 0
Add a comment
Know the answer?
Add Answer to:
30 people are selected randomly from a certain town. If their mean age is 32.2 and...
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. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions

  • 50 people are selected randomly from a certain town. If their mean age is 60.5 and...

    50 people are selected randomly from a certain town. If their mean age is 60.5 and o=4, find a 95% confidence interval for the true mean age, u, of everyone in the town. Show all work!

  • 4. The mean age of 50 randomly selected teachers in southern California was 42.5. If it...

    4. The mean age of 50 randomly selected teachers in southern California was 42.5. If it is known from other studies that the standard deviation of ages of all teachers is 8.75, (a) (2 points) Find the critical value a/2 or ta/2 that properly applies in this problem for 95% confidence interval. 05 (b) (2 points) Find the 95% confidence interval for the mean age of all teachers in southern California. Page (b) (e) (2 points) Find the margin of...

  • 3. The mean age of sample of 100 cars from a certain manufacturer is found to...

    3. The mean age of sample of 100 cars from a certain manufacturer is found to be eleven years. If the sample standard deviation of car ages is 5 years, give a 99% confidence interval for the mean age of cars from this manufacturer. 4. The sample standard deviation of the ages of a random sample of 40 television sets in a neighborhood is 3 years. Find a 95% confidence interval for the standard deviation of the entire population of...

  • In a certain management study, 15 randomly selected managers were found to spend a mean of...

    In a certain management study, 15 randomly selected managers were found to spend a mean of 2.40 hours each day on paperwork with a standard deviation of 1.30 hours. Construct a 90% Confidence Interval for the mean time spent on paperwork by all managers. State the meaning of the interval in the context of the problem. Use the given data to construct a confidence interval at the requested level: x = 125, n = 317, confidence level 95% (Hint: Refer...

  • A survey of 25 randomly selected customers found that their average age was 31.84 years with...

    A survey of 25 randomly selected customers found that their average age was 31.84 years with a standard deviation of 9.84 years. What would the critical value t* be for a 95% confidence interval with 99 degrees of freedom? What would the margin of error be for a 95% confidence interval for this data (with the sample size of 25)? Construct a 95% confidence interval for the mean age of all customers for this data (with the sample size of...

  • an economics professor randomly selected 100 millionaires in the united states. the average age of these...

    an economics professor randomly selected 100 millionaires in the united states. the average age of these millionaires was 54.8 years with a standard deviation of 7.9 years. what is the 95% confidence interval for the mean age, of all united states millionaires. A.) A confidence interval for the mean using a table value from the standard normal distribution B.) A confidence interval for the mean using a table value from the t distribution C.) A confidence interval for a proportion...

  • 2. In a random sample of 26 people, the mean commute time to work was 32.2...

    2. In a random sample of 26 people, the mean commute time to work was 32.2 minutes and the standard deviation was 7.1 minutes. Assume the population is normally distributed and use a t-distribution to construct a 80% confidence interval for the population mean "u". What is the margin of error of "u"? Interpret the results.

  • Randomly selected 17 student cars have ages with a mean of 7.9 years and a standard...

    Randomly selected 17 student cars have ages with a mean of 7.9 years and a standard deviation of 3.6 years, while randomly selected 18 faculty cars have ages with a mean of 5 years and a standard deviation of 3.5 years. Construct a 95% confidence interval estimate of the difference μs−μf, where μs is the mean age of student cars and μf is the mean age of faculty cars.

  • Confidence Intervals: A group of 50 randomly selected JWU students have a mean age of 20.5...

    Confidence Intervals: A group of 50 randomly selected JWU students have a mean age of 20.5 years. Assume the population standard deviation is 1.5 years. Construct a 99% confidence interval for the JWU population mean age. State your answer. (Zc 2.57) 1. 2. Construct a 90% confidence interval for the population mean, . Assume the population has a 2 normal distribution. A random sample of 20 JWU college students has mean annual earnings of 0 $3310 with a standard deviation...

  • A sample of 36 randomly selected students has a mean test score of 83.4 with a...

    A sample of 36 randomly selected students has a mean test score of 83.4 with a standard deviation of 8.92. Assume the population has a normal distribution. Find the margin of error, and then find the 95% confidence interval for the population mean.

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT