A business school placement director wants to estimate the mean annual salaries 5 years after students graduate. A random sample of 25 such graduates found a sample mean of 42 740 USD and a sample standard deviation of 4 780 USD. Find a 90% confidence interval for the population mean, assuming that the population distribution is normal.
Added by Christine B.
Step 1
We are given the sample mean ($\bar{x}$) as 42,740 USD, the sample standard deviation (s) as 4,780 USD, and the sample size (n) as 25. Show more…
Show all steps
Close
Your feedback will help us improve your experience
Lien Le and 57 other Intro Stats / AP Statistics educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Business school years after students' placement director wants to estimate the mean annual salaries of graduates. A random sample of 37 such graduates found a sample mean of $48,000 and a sample standard deviation of $8,500. Find a 95% confidence interval for the population mean, assuming that the population distributions are normal.
Keondre P.
A business school placement director wants to estimate the mean annual salaries 5 years after students graduate. A random sample of 15 such graduates found a sample mean of $42,740 and a sample standard deviation of $4,780. (a) Find the UCL and LCL of a 98% confidence interval for the population mean, assuming that the population distribution is normal. (b) What is the LCL? (answer in two decimal places) What is the UCL? (answer in two decimal places)
Lakshya H.
Annual starting salaries for college graduates with degrees in business administration are generally expected to be between $40,000 and $50,000. Assume that a 95% confidence interval estimate of the population mean annual starting salary is desired. What is the planning value for the population standard deviation (to the nearest whole number)? How large a sample should be taken if the desired margin of error is as shown below (to the nearest whole number)? a. $500? b. $200? c. $100?
Derek F.
Recommended Textbooks
Elementary Statistics a Step by Step Approach
The Practice of Statistics for AP
Introductory Statistics
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD