5_Ch_1_Data_Analysis

5_Ch_1_Data_Analysis - DATA ANALYSIS Example 2 Suppose a...

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

View Full Document Right Arrow Icon
DATA ANALYSIS Example 2. Suppose a student has the following scores on tests: 65, 86, 79, and 92. What are the mean, median, and standard deviation for these scores? 1 2 1 n i n i x x x x Mean Average x n n = + + ⋅⋅⋅ + = = = = 65 86 79 92 + + + 80.5 4 x = = Median : (1) order numbers from smallest to largest. (2) if odd number of results, median is middle number. (3) If even number of results, median is average of two middle numbers. 79 86 82.5 2 Median + = = 65 79 86 92 + + +
Background image of page 1

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

View Full Document Right Arrow Icon
( 29 1 The larger terms like: the bigger the standard deviation (or error). x x - Standard deviation is a quantitative measure of how spread out the results are. For example, if all the results are the same the standard deviation is 0. If all the results are very different the standard deviation is large. Problem: errors can’t cancel, but are accumulative: ( 29 2 1 So is used. x x - ( 29 0.5 2 1 Standard deviation 1 n i i x x s n = - = = - ( 29 ( 29 ( 29 ( 29
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.

{[ snackBarMessage ]}

Page1 / 7

5_Ch_1_Data_Analysis - DATA ANALYSIS Example 2 Suppose a...

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