b2201_Quiz02

b2201_Quiz02 - (6 pages; revised 10/05/09) Page 1 of 2201...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
(6 pages; revised 10/05/09) Page 1 of 2201 Quiz 02 Louisiana State University EXST 2201 Quiz 02 Fall 2009 Name: _________________________ Section: __________ Score: __________ Due: In Lab Week of October 12 (100 pts) Directions : Put your answer (letter) in the associated blank. You may use any book and talk to any person. You do not have to show your work to get credit. 1. Suppose a random sample of size 34 is obtained from a population with population mean 30 and population standard deviation 4. A. What is the shape of the sampling distribution of the sample average? …………………………………………………. _____ (5 pts) a) Unknown shape b) Bell shaped c) Block shaped d) Horn shaped B. What is the mean of the sampling distribution of the sample average? …………………………………………………. _____ (5 pts) a) 0.88 b) 8.50 c) 30 d) 120 C. What is the standard error of the sampling distribution of the sample average? …………………………………………………. _____ (5 pts) a) 0.118 b) 1.133 c) 0.686 d) 0.882 D. What is the probability the sample average is greater than 30.2 ? ……… _____ (5 pts) a) 0.2514 b) 0.3859 c) 0.7486 d) 0.6147 E. What is the probability the sample average is less than or equal to 30.6 ? …………………………………………… _____ (5 pts) a) 0.1909 b) 0.6423 c) 0.5768 d) 0.8078
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
(6 pages; revised 10/05/09) Page 2 of 2201 Quiz 02 2. A simple random sample of size n is drawn from a population with. x-bar = 59.2 sigma = 3.8 A. What is the point estimate of the population mean? _____ (5 pts) a) 3.8 b) 55.4 c) 59.2 d) 15.6 B. What is the 90% CI estimate of the mean if n is 45 ? _____ (5 pts) a) (58.3, 60.1) b) (59.1, 59.3) c) (58.1, 60.3) d) (58.3, 60.4) C. What is the 90% CI estimate of the mean if n is 55 ? _____ (5 pts) a) (58.4, 60.4) b) (58.2, 60.2) c) (58.4, 60.0) d) (59.1, 59.3) D. Increasing n causes the confidence interval to become? _____ (5 pts) a) No change. b) Wider. c) Narrower. d) Taller. 3. A simple random sample of size n is drawn from a population with. x-bar = 35.1 s = 8.7 A. For a 95% confidence interval and a sample size 20, what is the critical value? _____ (5 pts) a) 1.645 b) 1.725 c) 1.96 d) 2.093 B. What is the 90% CI estimate of the mean if n is 40 ? _____ (5 pts) a) (32.4, 37.8) b) (32.8, 37.4)
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 10/10/2010 for the course STAT 1001 taught by Professor Mckenna during the Fall '09 term at LSU.

Page1 / 6

b2201_Quiz02 - (6 pages; revised 10/05/09) Page 1 of 2201...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online