# hw5ans - Statistics 500 Fall 2009 Solutions to Homework 5 1...

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

Statistics 500 – Fall 2009 Solutions to Homework 5 1 1. Diagnostics for the diet and longevity study (a) Independence: look at the study design. Treatments were randomly assigned to individual mice; longevity was measured on individual mice. So, e.u. = mouse is the same as the o.u. = mouse. No obvious problem with lack of independence. (b) Equal variances: a variety of diagnostic methods (e.g. residual vs predicted value plot, box plots of the observations in each group, or calculation of the within group s.d.) or tests (Levene’s test) are acceptable. All groups have similar variabilities. No problem with equal variances. (c) Normality: If you pool the residuals, then plot a histogram or quantile-quantile plot, you see some deviations from normality: there are some especially small values. If you look at each group separately, you see some groups that seem normal and others that do not. I think there is a problem with normality. Other well justified answers were accepted. 3 0 3 5 4 0 4 5 -2 5 -1 5 -5 0 5 1 0 P re d i c te d R e sid u a l -3 -2 -1 0 1 2 3 -2 5 -1 5 -5 0 5 1 0 T h e o re ti c a l Q u a n tile s S a m p le Q u a n tile s 2) Marker effects in a genome-wide study (a) 10 Markers: numbered 1-10 Here are my computations: marker pvalue adjP 7 0.000 0.004 9 0.000 0.013 1 0.001 0.046 5 0.002 0.046 3 0.002 0.040 6 0.003 0.053 2 0.004 0.050 8 0.004 0.051 4 0.005 0.052 10 0.005 0.047

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

View Full Document
Statistics 500 – Fall 2009 Solutions to Homework 5 2 63 0.008 0.071 73 0.009 0.072 24 0.010 0.073
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern