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- From Mathematics, Statistics
- Due on 01 Mar, 2015 07:30:00
- Asked On 28 Feb, 2015 08:52:59
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STAT 200 Week 7 Homework

Lane et al.

2. The formula for a regression equation is Y’ = 2X + 9. a. What would be the predicted score for a person scoring 6 on X? b. If someone’s predicted score was 14, what was this person’s score on X?

6. For the X,Y data below, compute: a. r and determine if it is significantly different from zero. b. the slope of the regression line and test if it differs significantly from zero. c. the 95% confidence interval for the slope.

x |
y |

4 |
6 |

3 |
7 |

5 |
12 |

11 |
17 |

10 |
9 |

14 |
21 |

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The expected frequencies are calculated by the number of scores by the proportion. The final column shows the observed num...

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Homework Week7
Q.2. The formula for a regression equation is Y’ = 2X + 9.
a. What would be the predicted score for a person scoring 6 on X?
The predicted score =2*6+9=21
b. If someone’s predicted score was 14, what was this person’s score on X?
The persons score on X =(14-9)/2=2.5
Q.6. For the X, Y data below, compute:
a. r and determine if it is significantly different from zero.
r=0.656 and the it is significantly different from zero.
b. the slope of the regression line and test if it differs significantly from zero.
The regression equation is
Y = 3.81 + 0.833 X
Predictor Coef SE Coef T P
Constant 3.808 4.227 0.90 0.419
X 0.8331 0.4791 1.74 0.157
The slope of the regression is 0.8331 and the p value is 0.157>0.05 therefore it is not significantly differ from zero.
c. the 95% confidence interval for the slope.
The 95% confidence interval for the slope is (-0.497155842, 2.163260395)
Q.5. At a school pep rally, a group of...

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