Author Question: A researcher wants to use a paired sample to determine whether the mean number of hours spent ... (Read 125 times)

crobinson2013

  • Hero Member
  • *****
  • Posts: 535
A researcher wants to use a paired sample to determine whether the mean number of hours spent exercising per week for married men differs from the mean number of hours spent exercising per week for married women.
 
  Identify the variable for the proposed hypothesis test.
  A) Gender
  B) Difference between mean hours of exercise per week for married men and mean hours of exercise per week for married women
  C) Marital status
  D) Hours of exercise per week

Question 2

For each of 200 randomly selected cities, Pete compared data for the number of churches in the city (x) and the number of homicides in the past decade (y).
 
  He calculated the linear correlation coefficient and was surprised to find a strong positive linear correlation for the two variables. Does this suggest that when a city builds new churches this will tend to cause an increase in the number of homicides? Why do you think that a strong positive linear correlation coefficient was obtained?



adf223

  • Sr. Member
  • ****
  • Posts: 304
Answer to Question 1

D

Answer to Question 2

The positive linear correlation coefficient suggests that cities with a lot of churches also tend to have a high number of homicides. However, the fact that there is a correlation does not imply that there is causation. It is unlikely that building new churches would lead to an increase in the number of homicides. It is more likely that the correlation between the two variables is explained by their association with another variable (called a lurking variable), population. Larger cities tend to have both more churches and more homicides than small cities.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

Did you know?

Signs and symptoms that may signify an eye tumor include general blurred vision, bulging eye(s), double vision, a sensation of a foreign body in the eye(s), iris defects, limited ability to move the eyelid(s), limited ability to move the eye(s), pain or discomfort in or around the eyes or eyelids, red or pink eyes, white or cloud spots on the eye(s), colored spots on the eyelid(s), swelling around the eyes, swollen eyelid(s), and general vision loss.

Did you know?

About 80% of major fungal systemic infections are due to Candida albicans. Another form, Candida peritonitis, occurs most often in postoperative patients. A rare disease, Candida meningitis, may follow leukemia, kidney transplant, other immunosuppressed factors, or when suffering from Candida septicemia.

Did you know?

Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

Did you know?

Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.

For a complete list of videos, visit our video library