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

Author Question: Sunlight makes everyone feel better.. To test this claim, 30 college students receive special lights ... (Read 111 times)

skymedlock

  • Hero Member
  • *****
  • Posts: 561
Sunlight makes everyone feel better.. To test this claim, 30 college students receive special lights for their bedrooms that slowly turn on in the morning with imitation sunlight. The experiment takes place in January, when it is still dark out in the morning. Prior to participation, the students fill out a questionnaire to measure their general mood. The average score was 2.73 . After three weeks with the special light they fill in the questionnaire again. The average score this time was 3.13 . The standard deviation of the differences was 0.822 . Calculate a 95 confidence interval for the difference in average mood scores (after  before).
 a. (0.14, 0.66)
  b. (0.09, 0.71)
  c. (0.19, 0.61)
  d. None of the above

Question 2

In each situation, indicate whether it would make more sense to find a confidence interval for the population parameter or to conduct a hypothesis test for a specific null value. If your answer is a hypothesis test, specify the null value that you would test. A high school teacher is interested to know if students who take a foreign language will get higher grades if their final exam is an oral exam instead of a written exam. The following year he asks all of the Spanish teachers to give their students an oral exam at the end of the course. The average exam score in the previous years was 68 (out of a possible 100 points).



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

samiel-sayed

  • Sr. Member
  • ****
  • Posts: 337
Answer to Question 1

B

Answer to Question 2

Hypothesis test; the null value would be a mean score of 68 .




skymedlock

  • Member
  • Posts: 561
Reply 2 on: Jul 24, 2018
Thanks for the timely response, appreciate it


cdmart10

  • Member
  • Posts: 332
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

 

Did you know?

The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.

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?

All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.

Did you know?

Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.

Did you know?

According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.

For a complete list of videos, visit our video library