The mayor of a large metropolitan city wants to estimate the average IQ of the city's residents within an error margin of 3 at a confidence level of 90%. At least how many people does s/he need to sample? Assume a population standard deviation of 15. 68 96 25 153
Added by Jason G.
Close
Step 1
Step 1: Calculate the Z-value for a 90% confidence level. Show more…
Show all steps
Your feedback will help us improve your experience
Christopher Dzorkpata and 66 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
"The major of large metropolitan city wants estimate the average IQ of the city' $ residents within an error margin of 3 at confidence level of 90%. How large sample required? Assume population standard deviation of 15_"
Gerald H.
A population's standard deviation is 15. We want to estimate the population mean with a margin of error of 3, with a 90% level of confidence. How large a sample is required. (Round your intermediate calculations to 2 decimals places and round your answer up to the next whole number.) Sample required is
Ivan K.
Find the sample size required to estimate the population mean. See the preceding exercise, in which we can assume that $\sigma=15$ for the IQ scores. Attorneys are a group with IQ scores that vary less than the IQ scores of the general population. Find the sample size needed to estimate the mean IQ of attorneys, given that we want $98 \%$ confidence that the sample mean is within 3 IQ points of the population mean. Does the sample size appear to be practical?
Estimating Parameters and Determining Sample Sizes
Estimating a Population Mean
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