Exhibit 16-4 In a Laboratory Experiment, Data Were Gathered on the Life

question 1

Multiple Choice

Exhibit 16-4
In a laboratory experiment, data were gathered on the life span (y in months) of 33 rats, units of daily protein intake (x₁) , and whether or not agent x₂ (a proposed life extending agent) was added to the rats diet (x₂ = 0 if agent x₂ was not added, and x₂ = 1 if agent was added.) From the results of the experiment, the following regression model was developed. = 36 + 0.8x₁ - 1.7x₂
Also provided are SSR = 60 and SST = 180.
-Refer to Exhibit 16-4. If we want to test for the significance of the model, the critical value of F at 95% confidence is

• A)8.62
• B)3.35
• C)2.92
• D)2.96

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Definitions:

Dys-

A prefix denoting difficult, painful, or abnormal.

Enamel

The hard, protective outer covering of the crown of a tooth, made of mineralized substances.

Cementum

A specialized, calcified substance covering the root of a tooth, playing a vital role in tooth stability by anchoring the tooth to the jawbone through the periodontal ligament.

Dentin

The hard, dense, bony tissue forming the bulk of a tooth beneath the enamel.