Questions from Statistics

Q: What does the square of the correlation coefficient, r2, tell

What does the square of the correlation coefficient, r2, tell us about a best-fit line?

Q: What type of hypothesis test would be used to test the claim

What type of hypothesis test would be used to test the claim in Exercise 5: left-tailed, right-tailed, or two-tailed?

Q: What is multiple regression? When is it useful?

What is multiple regression? When is it useful?

Q: Data showed a strong correlation between exposure to second-hand smoke

Data showed a strong correlation between exposure to second-hand smoke and the measured amount of cotinine in the body. Follow-up experiments ruled out coincidence as an explanation for this correlati...

Q: If causality has been established beyond reasonable doubt, then we can

If causality has been established beyond reasonable doubt, then we can be 100% confident that the causality is real.

Q: The time it takes to run a marathon is affected by the

The time it takes to run a marathon is affected by the amount of time spent training for it.

Q: Lower back pain can be reduced by exposing the back to a

Lower back pain can be reduced by exposing the back to a magnet.

Q: Drinking greater amounts of alcohol decreases a person’s reaction time.

Drinking greater amounts of alcohol decreases a person’s reaction time.

Q: People who meditate more are likely to have higher incomes.

People who meditate more are likely to have higher incomes.

Q: When some people climb to higher altitudes without supplemental oxygen, they

When some people climb to higher altitudes without supplemental oxygen, they tend to experience increased physiological problems, such as headaches or disorientation. Briefly describe how the higher a...