chap1-4 - Stat-315 Applied Probability and Statistics...

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

View Full Document Right Arrow Icon
Stat-315 Applied Probability and Statistics Midterm 1 (Fall 2009) Name: Score: Students are required to finish the exam in class within two hours independently. Cheating is NOT allowed. Any forms of cheating or attempt to cheat is a serious offense which may lead to dismissal! Calculators (including TI-calculators) and two formula sheets are allowed. Please follow the steps to perform a test of hypothesis with either the critical value approach or the p-value approach. 1. ( 25 pts ) Disks of polycarbonate plastic from a supplier are analyzed for scratch and shock resistance. The results from 100 disks are summarized below: shock resistance high low scratch high 60 15 resistance low 20 5 Let A denote the event that a disk has low shock resistance, and B denote the event that a disk has high scratch resistance. Determine (a) The number of disks in A B and A B . ( 3 pts each ) (b) P ( A ), P ( A B ) and P ( B | A ). ( 3 pts each ) (c) Are events A and B independent? ( 5pts ) Justify your answer. ( 5pts ) 1
Background image of page 1

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

View Full DocumentRight Arrow Icon
2. ( 10 pts
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 02/05/2012 for the course ST 315 taught by Professor Staff during the Fall '11 term at S. Alabama.

Page1 / 5

chap1-4 - Stat-315 Applied Probability and Statistics...

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