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

Author Question: An advertising firm conducts 3 different campaigns, each in 14 different cities, to promote a ... (Read 57 times)

luminitza

  • Hero Member
  • *****
  • Posts: 555
An advertising firm conducts 3 different campaigns, each in 14 different cities, to promote a certain product, and tracks the product sales attributable to each campaign in each city. Determine whether the study is observational or designed.
 
  A) observational B) designed

Question 2

An educator wanted to look at the study habits of university students.
 
  As part of the research, data was collected for three variables - the amount of time (in hours per week) spent studying, the amount of time (in hours per week) spent playing video games and the GPA - for a sample of 20 male university students. As part of the research, a 95 confidence interval for the average GPA of all male university students was calculated to be: (2.95, 3.10). Which of the following statements is true?
  A) In construction of the confidence interval, a t-value with 19 degrees of freedom was used.
  B) In construction of the confidence interval, a t-value with 20 degrees of freedom was used.
  C) In construction of the confidence interval, a z-value with 20 degrees of freedom was used.
  D) In construction of the confidence interval, a z-value was used.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

voltaire123

  • Sr. Member
  • ****
  • Posts: 301
Answer to Question 1

B

Answer to Question 2

A




luminitza

  • Member
  • Posts: 555
Reply 2 on: Jul 24, 2018
Thanks for the timely response, appreciate it


meganmoser117

  • Member
  • Posts: 303
Reply 3 on: Yesterday
Wow, this really help

 

Did you know?

Cyanide works by making the human body unable to use oxygen.

Did you know?

Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.

Did you know?

Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.

Did you know?

The oldest recorded age was 122. Madame Jeanne Calment was born in France in 1875 and died in 1997. She was a vegetarian and loved olive oil, port wine, and chocolate.

Did you know?

Patients who have undergone chemotherapy for the treatment of cancer often complain of a lack of mental focus; memory loss; and a general diminution in abilities such as multitasking, attention span, and general mental agility.

For a complete list of videos, visit our video library