This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: When constructing a confidence interval for the difference in two population means, it is ... (Read 214 times)

bclement10

  • Hero Member
  • *****
  • Posts: 560
on: Jul 24, 2018
When constructing a confidence interval for the difference in two population means, it is appropriate to use the pooled standard error only when
 a. the population standard deviations can be assumed to be equal.
  b. the sample standard deviations are exactly equal.
  c. the population means can be assumed to be equal.
  d. the sample means are exactly equal.

Question 2

Contradicting some previous research, a new study finds that frequent use of painkillers does not substantially increase a healthy man's risk of developing hypertension. The study finds that the observed difference between the two groups was not statistically significant. Explain in your own words what that means.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

pami445

  • Sr. Member
  • ****
  • Posts: 303
Reply #1 on: Jul 24, 2018
Answer to Question 1

A

Answer to Question 2

The sample proportions of men that developed hypertension may actually have been (slightly) different between the two groups, but the relative size of this difference was not large enough to convince us that this may indicate a difference in the population. The (small) difference that was observed was a difference that is observed rather often, if indeed there is no difference between the two groups.


bclement10

  • Hero Member
  • *****
  • Posts: 560
Reply #2 on: Jul 24, 2018
Thank you!


pami445

  • Sr. Member
  • ****
  • Posts: 303
Reply #3 on: Jul 24, 2018
Always glad to help...


« previous next »
 

Did you know?

The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.

Did you know?

The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.

Did you know?

Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.

Did you know?

It is important to read food labels and choose foods with low cholesterol and saturated trans fat. You should limit saturated fat to no higher than 6% of daily calories.

Did you know?

In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

The Dugong is an endangered species; the largest remaining population is found in Australian waters The Dugong is an endangered species; the largest remaining population is found in Australian waters
A genetic bottleneck reduces a population temporarily to very low levels, removing much of its genet A genetic bottleneck reduces a population temporarily to very low levels, removing much of its genet
Population Losses in the South, 1920–1930 Population Losses in the South, 1920–1930
Relationship Between Income per Capita and Population Growth Relationship Between Income per Capita and Population Growth
Difference Between Solar and Sidereal Day Difference Between Solar and Sidereal Day
Constructing a Three-Point Recombination Map Constructing a Three-Point Recombination Map
Video: The Vestibular System

For a complete list of videos, visit our video library