ZuoTi.Pro
Question

You are in an Intro Psych class of 137 students. You ask 25 of your classmates...

You are in an Intro Psych class of 137 students. You ask 25 of your classmates their age and calculate a mean of 18.2 and a sample standard deviation of 1.5. Calculate the standard error and report the 80% and 99% confidence intervals for the estimated average age of the class

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:
You are in an Intro Psych class of 137 students. You ask 25 of your classmates...
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

  • Students in an introductory statistics class were asked to report the age of their mothers when...

    Students in an introductory statistics class were asked to report the age of their mothers when they were born. Summary statistics include Sample size: 28 students Sample mean: 29.643 years Sample standard deviation: 4.564 years a. Calculate the standard error of this sample mean. b. Determine and interpret a 90% confidence interval for the mother’s mean age (at student’s birth) in the population of all students at this university. c. How would a 99% confidence interval compare to the 90%...

  • Students in an introductory statistics class were asked to report the age of their mothers when...

    Students in an introductory statistics class were asked to report the age of their mothers when they were born. Summary statistics include Sample size: 28 students Sample mean: 29.643 years Sample standard deviation: 4.564 years a. Calculate the standard error of this sample mean. b. Determine and interpret a 90% confidence interval for the mother’s mean age (at student’s birth) in the population of all students at this university. c. How would a 99% confidence interval compare to the 90%...

  • random sample of 28 students at the university showed an average age of 25 years and...

    random sample of 28 students at the university showed an average age of 25 years and a sample standard deviation of 2 years. Calculate the margin of error for a confidence interval for age at the 98% level of confidence O 1.235 O : 1.645 ○ :0.945 O 0.888

  • The age of a students in a class is a normal random variable. There are 80...

    The age of a students in a class is a normal random variable. There are 80 students in our class. I select 9 students randomly and calculate the mean of their ages (sample mean). I repeat this experiment 1,000,000 times. Then I calculate the mean and standard deviation of the 1,000,000 sample means that I measured; the calculated values are 22 and 4, respectively. What is the probability that the age of a randomly selected student in the class is...

  • The age of a students in a class is a normal random variable. There are 80...

    The age of a students in a class is a normal random variable. There are 80 students in our class. I select 9 students randomly and calculate the mean of their ages (sample mean). I repeat this experiment 1,000,000 times. Then I calculate the mean and standard deviation of the 1,000,000 sample means that I measured; the calculated values are 22 and 4, respectively. What is the probability that the age of a randomly selected student in the class is...

  • One college class had a total of 90 students. The average score for the class on...

    One college class had a total of 90 students. The average score for the class on the last exam was 86.3 with a standard deviation of 4.4. A random sample of 39 students was selected. a. Calculate the standard error of the mean. b. What is the probability that the sample mean will be less than 88​? c. What is the probability that the sample mean will be more than 87​? d. What is the probability that the sample mean...

  • find the following confidence intervals Near the beginning of the semester, you administered a survey to...

    find the following confidence intervals Near the beginning of the semester, you administered a survey to 10 students. Suppose we wanted to use your sample to calculate the mean age of college students. If your sample mean is 20.4 years and sample standard deviation is 1.27 years, then what are the following confidence intervals? (Round your answers to three decimal places.) 80% CI: LCL = years. 80% CI: UCL = years. 90% CI: LCL = years. 90% CI: UCL =...

  • 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 student conducted a survey among 100 current and former students in a particular class. The...

    A student conducted a survey among 100 current and former students in a particular class. The students asked (hypothetically, of course) how much money would it take to successfully bribe the instructor? One answer came back as "If you have to ask, you can't afford it". Among the remaining 99 answers, the average amount was $250,420 with a standard deviation of $48,097. Calculate the 90% confidence interval for the average amount students think it would take to successfully bribe the...

  • Fifty students are enrolled in an Economics class. After the first examination, a random sample of...

    Fifty students are enrolled in an Economics class. After the first examination, a random sample of five papers was selected. The grades were 60, 70, 75, 80, 90. a. Calculate the estimate of the standard error of the mean. b. What assumption must be made before we can determine an interval for the mean grade of all the students in the class? Explain why? c. Assume the assumption of part(b) is met. Provide a 90% confidence interval for the 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