« previous next »

Author Question: To study the effects of aging, Professor Drake compares the reaction times of 60-year-olds with ... (Read 140 times)

Arii_bell

  • Hero Member
  • *****
  • Posts: 596
on: Jun 22, 2018
To study the effects of aging, Professor Drake compares the reaction times of 60-year-olds with those of 30-year-olds. She tests all younger subjects in the morning, and all older subjects in the afternoon.
 
  She concludes that aging causes a decline in the speed of responses. This study lacks ________ because of potential ________.
  A) external validity; demand characteristics
  B) external validity; confounds
  C) internal validity; demand characteristics
  D) internal validity; confounds

Question 2

Which of the following could be considered a limitation to the experimental method?
 
  A) The laboratory settings can be very artificial.
  B) The researcher can't make causal statements.
  C) The researcher has very little control over what happens in the study.
  D) The researcher can't manipulate the independent variable.


lkanara2

  • Sr. Member
  • ****
  • Posts: 329
Reply #1 on: Jun 22, 2018
Answer to Question 1

Answer: D

Answer to Question 2

Answer: A


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

For pediatric patients, intravenous fluids are the most commonly cited products involved in medication errors that are reported to the USP.

Did you know?

A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.

Did you know?

The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

Did you know?

Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

Did you know?

Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.

Water striders serve as a model organism for the study of sexual conflict between males and females. Water striders serve as a model organism for the study of sexual conflict between males and females.
Each year, the leaders of the world’s eight most powerful nations meet in a secluded place to make ... Each year, the leaders of the world’s eight most powerful nations meet in a secluded place to make ...
Press with (A) fingertips into GB-30; or (B) with thumb into GB-30; press 2–3 times. Press with (A) fingertips into GB-30; or (B) with thumb into GB-30; press 2–3 times.
Thiamine pyrophosphate in the pyruvate decarboxylase reaction Thiamine pyrophosphate in the pyruvate decarboxylase reaction
Chelsea Donahue has a​ 20-year home mortgage of ​78,000 at​ 7.50% interest and will pay ... Chelsea Donahue has a​ 20-year home mortgage of ​78,000 at​ 7.50% interest and will pay ...
The effects of a single crossover in a paracentric inversion heterozygote The effects of a single crossover in a paracentric inversion heterozygote
Video: Language Areas Animation

For a complete list of videos, visit our video library