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

Author Question: In order to estimate the average time spent per student on the computer terminals at a local ... (Read 90 times)

krzymel

  • Hero Member
  • *****
  • Posts: 548
In order to estimate the average time spent per student on the computer terminals at a local university, data were collected for a sample of 81 business students over a one-week period. Assume the population standard deviation is 1.8 hours. If the sample mean is 9 hours, then the 95 confidence interval is
 a. 7.04 to 10.96 hours.
   b. 7.36 to 10.64 hours.
   c. 7.80 to 10.20 hours.
   d. 8.61 to 9.39 hours.

Question 2

In a sample of 400 people, 250 indicated that they prefer domestic wines, while 140 said they prefer European wines, and 10 indicated no preference. We want to use the sign test to determine if there is evidence of a significant difference in the preferences for the two types of wine. Hint: Use the continuity correction factor.
 a. Provide the hypotheses to be tested.
  b. Compute the mean.
  c. Compute the standard deviation.
  d.. At  = .05, test to determine if there is evidence of a significant difference in the preferences for the two types of wine.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

ktidd

  • Sr. Member
  • ****
  • Posts: 319
Answer to Question 1

d

Answer to Question 2

a. H0: p = .5
Ha: p  .5
b. 195
c. 9.874
d.. Test Statistic z = 5.52; p-value < .05, therefore reject H0 and conclude that there is a significant difference in the preferences for the two types of wine.




krzymel

  • Member
  • Posts: 548
Reply 2 on: Jun 24, 2018
Excellent


juliaf

  • Member
  • Posts: 344
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

 

Did you know?

Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.

Did you know?

There are more nerve cells in one human brain than there are stars in the Milky Way.

Did you know?

More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.

Did you know?

One way to reduce acid reflux is to lose two or three pounds. Most people lose weight in the belly area first when they increase exercise, meaning that heartburn can be reduced quickly by this method.

Did you know?

The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

For a complete list of videos, visit our video library