Math 63- Homework 7 Sections 8.1-8.3 Name: Due: Wednesday, November 8, 2017 @ 6:
ID: 3357161 • Letter: M
Question
Math 63- Homework 7 Sections 8.1-8.3 Name: Due: Wednesday, November 8, 2017 @ 6:15PM Page lors- z hieeded to construct a confidence interval with confidence level Kound to 2 decimal places. Please draw, label, and shade the graph to receive full credit Total: 52 points 2 points each) l) Find the critical value za/ 2) A college admissions officer takes a simple random sample of 100 entering freshmen and computes their mean mathematics SAT scores to be 462. Assume the population standard deviation is 115. a) What is the appropriate point estimate? (circle one) x or p or s b) Find the value of point estimate. Round the answer io the neacsse whole number. Construct and interpret a 90% confidence interval for the mean Mathematics SAT score for entering freshman class. Round the answers to the nearest whole number. c) d) Find the margin of error.Explanation / Answer
1. Here we need to find z value for 92% CI
Which means we need to find P(-z<Z<z)=0.92
Using standard normal table we get P(-1.751<z<1.751)=0.92
Hence critical value for 92% CI is 1.751.