Unit 2-4

# Unit 2-4 - Density Curves Can be created by smoothing...

This preview shows pages 1–6. Sign up to view the full content.

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

View Full Document
Density Curves Can be created by smoothing histograms ALWAYS on or above the horizontal axis Has an area of exactly one underneath it Describes the proportion of observations that fall within a range of values Is often a description of the overall distribution Uses μ & σ to represent the mean & standard deviation
z score Standardized score Creates the standard normal density curve Has μ = 0 & σ = 1 σ μ - = x z

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

View Full Document
What do these z scores mean? -2.3 1.8 6.1 -4.3 2.3 σ below the mean 1.8 σ above the mean 6.1 σ above the mean 4.3 σ below the mean
Landfill. He must take a test to see if he is qualified for the job. The test has a normal distribution with μ = 45 and σ = 3.6. In order to qualify for the job, a person can not score lower than 2.5 standard deviations below the mean. Jonathan scores 35 on this test. Does he get the job? No, he scored 2.78 SD below the mean

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.

## This note was uploaded on 12/09/2011 for the course STATS 221 taught by Professor Nielson during the Fall '10 term at BYU.

### Page1 / 11

Unit 2-4 - Density Curves Can be created by smoothing...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online