This topic contains a solution. Click here to go to the answer

Author Question: Professor Johnston has found a strong positive correlation between wearing neckties and the ... (Read 85 times)

newbem

  • Hero Member
  • *****
  • Posts: 579
Professor Johnston has found a strong positive correlation between wearing neckties and the frequency of strokes (r = 0.89). He thinks that the necktie reduces blood flow to the brain, preventing the brain from receiving enough oxygen. Professor Johnston and his associates claim to have proven that wearing neckties causes strokes. What error has Professor Johnston made?
 
  a. An r = 0.89 is not a very large r-value.
  b. Professor Johnston is drawing a causal conclusion from correlational findings.
  c. Not everyone who wears a necktie wears it very tight.
  d. Professor Johnston should know that there are other ways for blood to reach the brain.

Question 2

If we calculate a correlation coefficient and we find that there is a relationship between the two variables, we
 
  a. know that the data must be interval or ratio.
  b. know, without referring to the study, that a correlational design was used.
  c. can conclude that changes in one variable cause changes in the other variable.
  d. cannot conclude that changes in one variable cause changes in the other variable.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

emilymalinowski12

  • Sr. Member
  • ****
  • Posts: 338
Answer to Question 1

B

Answer to Question 2

D




newbem

  • Member
  • Posts: 579
Reply 2 on: Jun 20, 2018
Excellent


triiciiaa

  • Member
  • Posts: 349
Reply 3 on: Yesterday
Wow, this really help

 

Did you know?

Adults are resistant to the bacterium that causes Botulism. These bacteria thrive in honey – therefore, honey should never be given to infants since their immune systems are not yet resistant.

Did you know?

Despite claims by manufacturers, the supplement known as Ginkgo biloba was shown in a study of more than 3,000 participants to be ineffective in reducing development of dementia and Alzheimer’s disease in older people.

Did you know?

Stevens-Johnson syndrome and Toxic Epidermal Necrolysis syndrome are life-threatening reactions that can result in death. Complications include permanent blindness, dry-eye syndrome, lung damage, photophobia, asthma, chronic obstructive pulmonary disease, permanent loss of nail beds, scarring of mucous membranes, arthritis, and chronic fatigue syndrome. Many patients' pores scar shut, causing them to retain heat.

Did you know?

The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.

Did you know?

Studies show that systolic blood pressure can be significantly lowered by taking statins. In fact, the higher the patient's baseline blood pressure, the greater the effect of statins on his or her blood pressure.

For a complete list of videos, visit our video library