Answered step by step
Verified Expert Solution
Link Copied!

Question

1 Approved Answer

Intro to statistics class. Please answer questions a, b e and f! Sokal and Rohlf (1981) describe an experiment that utilized a multi-level nested design.

Intro to statistics class. Please answer questions a, b e and f!

image text in transcribed
Sokal and Rohlf (1981) describe an experiment that utilized a multi-level nested design. Three treatments (Control, Compound 217, and Compound 217 plus sugar) were randomly assigned to six rats such that each treatment was administered to two rats. After a set period of time, multiple preparations were made on the liver of each rat (the data set you will use is a subset of the original data, in our data subset there are two preparations per rat). Two readings were then made on each preparation of the glycogen content, measured in what Sokal and Rohlf (1981) call \"arbitrary units\". Note that the rats are the experimental units; preparations and readings constitute two levels of subsampling. The following table provides an EMS column appropriate for this experiment. Note that at the top level the treatments (Factor A) is a xed effects factor. (a) (b) (C) (d) (e) (D Source df EMS A a - 1 6%, + 616% + cdo+ bchA/(a l) B (within A) I a(b 1) of, + do + cdo C (within B) ab(c l) of, + dog D (within C) abc(d 1) 63, State a model compatible with the EMS table above. (Recall model = model equation + model assumptions.) What set of null and alternative hypotheses would test for treatment effects? What set of null and alternative hypotheses would test if there is greater variation in glycogen content among rats than within rats? There is one more set of testable hypotheses; state this set. Using the data subset posted on our course's CourseLink website, obtain the appropriate AN OVA table for testing the three sets of hypotheses in (b) with the assistance of R's aov() function. The initial output may have some errors in how one or more F statistic values were calculated; if so, describe the nature of the errors and correct them for your nal ANOVA table. Draw appropriate conclusions from the results of your tests above. Estimate the three variance components in the model, and calculate the percentage that each contributes to the sum of the variance components. Suppose the researchers who had conducted the experiment had published their test for treatment effects using the F statistic originally provided by R to (alas, the reviewers did not catch the mistake). Subsequently, in a published Letter to the Editor, the researchers were accused of committing pseudoreplication in their test for treatment effects. Briey explain why this is a valid criticism. (This should only take one or two sentences.)

Step by Step Solution

There are 3 Steps involved in it

Step: 1

blur-text-image

Get Instant Access to Expert-Tailored Solutions

See step-by-step solutions with expert insights and AI powered tools for academic success

Step: 2

blur-text-image

Step: 3

blur-text-image

Ace Your Homework with AI

Get the answers you need in no time with our AI-driven, step-by-step assistance

Get Started

Recommended Textbook for

WebAssign For Calculus An Applied Approach

Authors: Ron Larson

10th Edition

1337879584, 9781337879583

More Books

Students also viewed these Mathematics questions

Question

Personal role: This consists of service to family and friends.

Answered: 1 week ago

Question

The role of life: It consists of your own service to yourself.

Answered: 1 week ago