MATH_221_SAMPLE_MODULE_2_UPDATED_SU_10

MATH_221_SAMPLE_MODULE_2_UPDATED_SU_10 - r = 1 appears not...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
MATH_221_SAMPLE_MODULE_2_SU_10 Exercise 1 A. Interpret the Correlation Coefficient Step 1 Retrieve or Copy the Given Data
Background image of page 1

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

View Full DocumentRight Arrow Icon
Step 2 Formula the Worksheet Click an empty cell such as A8 . With the above cell selected, enter the following formula: =CORREL(A2:A7,B2:B7) Use Ctrl + Shift + Enter to have the formula return a value. Observe the result. If the result is between 80 and 100 % , then there is a strong positive correlation.  We also conclude that as the weight increases, systolic blood pressure as increases. Exercise 2 A. Interpret the Correlation Coefficient
Background image of page 2
Notice that the above data appears to have a linear trend with a positive slope ( upward from left  to right ) .  Hence the answer cannot be a negative value.  The data set does not appear to be in a perfect linear form hence 
Background image of page 3

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

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5

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

View Full DocumentRight Arrow Icon
Background image of page 6
Background image of page 7

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

View Full DocumentRight Arrow Icon
Background image of page 8
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: r = 1 appears not to be the answer. The best answer appears to be r = 0.84 . Exercise 3 A. Interpret the Correlation Coefficient The data set appears to be in a perfect linear form with a decreasing slope, hence r = - 1 . Exercise 1 B. Find the Regression Equation Step 1 Retrieve or Copy the Given Data Step 2 Formula the Worksheet Highlight the cell range A32 : B32 . With the above region highlighted, enter the following formula: =LINEST(B2:B31,A2:A31) Use Ctrl + Shift + Enter to have the formula return the values. 0.555528219 25.02880809 This represents a line of best fit equal to: y = mx + b or y = 0.56x + 25.03...
View Full Document

This document was uploaded on 04/05/2011.

Page1 / 8

MATH_221_SAMPLE_MODULE_2_UPDATED_SU_10 - r = 1 appears not...

This preview shows document pages 1 - 8. Sign up to view the full document.

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