Health Sciences 3801A/B Lecture Notes - Lecture 3: Confidence Interval
1 Jun 2016
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A) calculate the regression line predicting visitors on the basis of halloween (x: ***not the same as in reading 1 more # at the end in the notes, (slope, (constant) M (halloween) = 6. 5: **change table in readings, graph . Predicted visitors (line of best fit ) = 44. 2 + 4. 9 (halloween) Problem if you change a pt. , slope is likely to change or if one collects an extra data pt. Broken line a little wiggle room. B) calculate the standard error" of the slope of halloween . Top (numerator) not explained, i. e. how much of the variability of y is unexplained (uncertainty) Uncertainty assoc. w/ the slope" of the line. Standard error" of the slope i. e. how much wiggle" room. Friday, january 30, 2015: a confidence interval is a range of values w/ a given probability of including the true slope (i. e. average slope that you would obtain if you repeated your analysis innumerable times)
