Professor Faulpelz Asks a Random Sample of High School Freshmen

question 18

Multiple Choice

Professor Faulpelz asks a random sample of high school freshmen about their TV viewing habits. Four years later, he obtains their final high school grade-point averages and compares these with the answers about TV viewing habits. He finds that students who watch a lot of TV get lower grades than those who don't. When it comes to high school GPA, the answers to the Faulpelz questionnaire on TV viewing habits:

• A) have predictive validity.
• B) are invalid because they are biased against students whose parents watch TV a lot.
• C) are invalid because there were no controls.
• D) are invalid because of convenience sampling.

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Definitions:

Iodobutane

An organic compound with the formula C4H9I, characterized as a butane molecule where one hydrogen atom has been replaced by an iodine atom.

Methanol

Methanol, a straightforward alcohol bearing the formula CH3OH, serves multiple purposes such as a solvent, antifreeze, fuel, and a foundational material for producing other chemicals.

E1 Reactions

A type of unimolecular nucleophilic substitution reaction where the rate-determining step involves the loss of a leaving group to form a carbocation intermediate.

Alkyl Halides

Organic compounds containing a halogen atom (chlorine, bromine, fluorine, or iodine) bonded to an alkyl group.