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Middle Finger We measured from the from the knuckle to the tip of the middle finger Recorded that measurement to the nearest 8 th inch Possible bias: nail length Forearm Length We measured from the elbow to the very end of the forearm or the start of the wrist Recorded that measurement to the nearest 8 th inch Possible bias: misjudging where the forearm ends Wrist Circumference We measured the circumference of the wrist from the point just below where your thumb joins your hand We recorded that measurement to the nearest 8 th inch Possible bias: measuring in the wrong place, bracelets that may have gotten in the way

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Scatter Plot: Positive, linear, weak R 2 -14% of the change in height can determined by the change in middle finger length

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Scatter Plot: Positive, moderately weak, linear R 2 - 27% of the change in height can be determined from the change in wrist circumference

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Scatter Plot: Positive, Moderate, linear R 2 - 47% of the change of height can be determined by the change is forearm length

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Females: have a higher y-intercept but a smaller slope › R =.44 › Weak Scattered Males: have a lower y-intercept but a higher slope › R =.10 › Weak Scattered

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Females: Higher y- intercept but lower slope › R =.31 › Weak Linear Male: Lower y- intercept but higher slope › R =.24 › Weak Scattered

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Females: have a lower y-intercept but a higher slope. › R =.16 › Weak linear Males: have a higher y-intercept but a lower slope. › R =.54 › Weak Linear

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Forearm length was chosen as our best model because… › The residual plot is scattered › With an r =.687, it has the highest correlation › 47% of the change in height can be determined by the change in the length of the forearm

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Jimmy › Forearm length = 10.5 › 3.62(10.5)+32.1=Height › Height = 70.11 inches › Actual Height = 69.5 inches › Residual = -.61inches Colleen › Forearm length = 9.5 inches › 3.62(9.5)+32.1=Height › Height = 66.49 inches › Actual Height = 64 inches › Residual = -2.49 inches Brandon Forearm length = 10.25 3.62(10.25)+32.1=Height Height = 69.205 inches Actual Height = 71 inches Residual = 1.795 inches

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Ms. Arden › Forearm length = 9 inches › 3.62(9)+32.1=Height › Predicted Height = 64.68 inches Mr. Smith › Forearm length = 11 inches › 3.62(11)+32.1=Height › Predicted Height = 71.92 inches Ms. Wilson › Forearm length = 10 inches › 3.62(10)+32.1=Height › Predicted Height = 68.3 inches Mrs. Robinson › Forearm length = 10 inches › 3.62(10)+32.1=Height › Predicted Height = 68.3 inches We are somewhat confident in our predictions because even though this model had the highest correlation out of all of the others, its strength is still only moderate

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Not measuring the same for everyone Not knowing where to call the measurement from

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Best body part to predict height would be the forearm (based on our data) How you measure can change your data

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Week 3, Session Exploring Linear Fits

Week 3, Session Exploring Linear Fits

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