Practice Exam 2

Practice Exam 2 - Statistics 224, lecture 1 (Bates) Midterm...

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

View Full Document Right Arrow Icon

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

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

Unformatted text preview: Statistics 224, lecture 1 (Bates) Midterm 2 2007-11-14 (p. 1) The xmp12.01 data set in the Devore6 package gives the palprebal fissure width (the width of the opening between the eyelids) and the occular surface area (OSA, the area of the exposed part of the eyeball) for several subjects. The experimenters wish to predict OSA from the fissure width. Questions 1 to 14 relate to this output. Palprebal fissure width (cm) Occular surface area (cm 2 ) 1 2 3 4 5 0.4 0.6 0.8 1.0 1.2 1.4 1.6 Fitted values Residuals-0.5 0.0 0.5 1 2 3 4 Standard normal quantiles Residuals-0.5 0.0 0.5-2-1 1 2 > summary(fm1 <- lm(OSA ~ palprebal, xmp12.01)) Call: lm(formula = OSA ~ palprebal, data = xmp12.01) Residuals: Min 1Q Median 3Q Max-0.60942 -0.19875 -0.01902 0.21727 0.66378 Coefficients: Estimate Std. Error t value Pr(>|t|) (Intercept)-0.3977 0.1680-2.367 0.0251 palprebal 3.0800 0.1506 20.453 <2e-16 Residual standard error: 0.308 on 28 degrees of freedom Multiple R-Squared: 0.9373, Adjusted R-squared: 0.935 F-statistic: 418.3 on 1 and 28 DF, p-value: < 2.2e-16 > confint(fm1) 2.5 % 97.5 % (Intercept) -0.7418897 -0.05358811 palprebal 2.7715014 3.38843310 > anova(fm1) Df Sum Sq Mean Sq F value Pr(>F) palprebal 1 39.686 39.686 418.32 < 2.2e-16 Residuals 28 2.656 0.095 > unlist(predict(fm1, list(palprebal = 1), se = TRUE)) fit se.fit df residual.scale 2.68222835 0.05676328 28.00000000 0.30800881 > qt(c(0.05, 0.025, 0.01, 0.005), df = 28, lower = FALSE) [1] 1.701131 2.048407 2.467140 2.763262 Statistics 224, lecture 1 (Bates) Midterm 2 2007-11-14 (p. 2) Data from the paper Evaluation of the Deuterium Dilution Technique Against the Test Weighing Procedure for the Determination of Breast Milk Intake ( Amer. J. Clinical Nutrition , 1983:996-1003) on the amount of milk ingested by each of 14 randomly selected infants is shown below. For each infant the milk intake at a feeding was measured by the Isotropic method and by the test-weighing method....
View Full Document

Page1 / 6

Practice Exam 2 - Statistics 224, lecture 1 (Bates) Midterm...

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