{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

# 09_13_1ans - STAT 400 Examples for(1 Fall 2011 5 Suppose...

This preview shows pages 1–2. Sign up to view the full content.

STAT 400 Examples for 09/13/2011 (1) Fall 2011 5. Suppose that on Halloween 6 children come to a house to get treats. A bag contains 8 plain chocolate bars and 7 nut bars. Each child reaches into the bag and randomly selects 1 candy bar. Let X denote the number of nut bars selected. a) Is the Binomial model appropriate for this problem? No . Without replacement Trials are not independent. b) Find the probability that exactly 2 nut bars were selected. 15 005 5 70 21 6 15 4 8 2 7 , C C C = 0.2937 . barb2sw barb2se 7 8 nut plain barb2down barb2down 2 4 OR 10 5 11 6 12 7 13 8 14 6 15 7 2 6 C 0.2937 . Hypergeometric Distribution : N = population size, S = number of “successes” in the population, N S = number of “failures” in the population, n = sample size. X = number of "successes" in the sample when sampling is done without replacement. Then n x n x N S N S X C C C N S N S n x n x x - - = - -

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 3

09_13_1ans - STAT 400 Examples for(1 Fall 2011 5 Suppose...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online