Author Question: For a normal distribution, a positive value of z indicates that a. all the observations must have ... (Read 58 times)

james

  • Hero Member
  • *****
  • Posts: 573
For a normal distribution, a positive value of z indicates that
 a. all the observations must have had positive values.
   b. the area corresponding to the z is either positive or negative.
   c. the sample mean is smaller than the population mean.
   d. the sample mean is larger than the population mean.

Question 2

Student advisors are interested in determining if the variances of the scores of day students and night students are the same. The following samples are drawn: Day Night n1 = 25 n2 = 31 s1 = 9.8 s2 = 14.7 Test the equality of the variances of the populations. Let  = .05.



akpaschal

  • Sr. Member
  • ****
  • Posts: 342
Answer to Question 1

d

Answer to Question 2

Since F = 2.25 > 2.21 (p-value is between .02 and .05), reject H0.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.

Did you know?

Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.

Did you know?

Tobacco depletes the body of vitamins A, C, and E, which can result in any of the following: dry hair, dry skin, dry eyes, poor growth, night blindness, abscesses, insomnia, fatigue, reproductive system problems, sinusitis, pneumonia, frequent respiratory problems, skin disorders, weight loss, rickets, osteomalacia, nervousness, muscle spasms, leg cramps, extremity numbness, bone malformations, decayed teeth, difficulty in walking, irritability, restlessness, profuse sweating, increased uric acid (gout), joint damage, damaged red blood cells, destruction of nerves, infertility, miscarriage, and many types of cancer.

Did you know?

Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.

Did you know?

Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.

For a complete list of videos, visit our video library