Density curve

397 views

Published on

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
397
On SlideShare
0
From Embeds
0
Number of Embeds
136
Actions
Shares
0
Downloads
3
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Density curve

  1. 1. Density Curve
  2. 2. What is a Density Curve? • A smooth curve that can be drawn over a histogram if you have a large number of observations • It is above the x-axis and the area between the curve and the x-axis its area is always 1 • These “curves” may be straight lines • A Uniform Density Curve looks like a rectangle
  3. 3. Normal Distribution • Normal Distribution - data that fits a normal (bell shaped) curve • We can utilize a z-score formula to help determine the population mean, standard deviation or the z-score if you have a sample mean or one piece of data • We can also utilize a z-score to find the percentile ranking of a piece of data
  4. 4. 68-95-99.7 Rule If data is Normal the 68-95-99.7 Rule applies This rule states that 68% of the data fall within 1 standard deviation 95% of the data fall within 2 standard deviations 99.7% of the data fall within 3 standard deviations

×