Chapter 21 Examples

Chapter 21 Examples - Chapter 21 Notes Examples Page 1 of 3...

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

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Chapter 21 Notes Examples Page 1 of 3 Example: USC Students From South Carolina Suppose the true proportion of USC students from SC is 0.71 (71%). Then, the sampling distribution of p for n = 137 is approximately normal with mean = p = 0.71 standard deviation = 039 . 137 2059 . 137 ) 29 . )( 71 . ( ) 1 ( = = = n p p Example: USC Students From South Carolina Compute and interpret a 95% confidence interval for the true proportion of USC students who are from SC. Lets say that this class is our sample. 79 out of 137 students are from SC. 58 . 137 79 = = p ) 66 . , 50 . ( 08 . 58 . ) 042 . ( 2 58 . 137 2436 . 2 58 . 137 ) 42 . )( 58 . ( 2 58 . ) 1 ( 2 = = = = = n p p p We are 95% confident that the true proportion of USC students who are from SC is at least 0.50 (50%) and at most 0.66 (66%). Example A bank randomly selected 250 checking account customers and found that 110 of them also had savings accounts at the same bank. Calculate the sample proportion of checking account customers who also have savings accounts....
View Full Document

This note was uploaded on 02/14/2011 for the course STAT 110 taught by Professor Johnson during the Fall '07 term at South Carolina.

Page1 / 3

Chapter 21 Examples - Chapter 21 Notes Examples Page 1 of 3...

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

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