« previous next »

Author Question: What is pooled variance? a. The weighted average of the two sample variances. b. The variance of ... (Read 55 times)

humphriesbr@me.com

  • Hero Member
  • *****
  • Posts: 550
on: Jun 20, 2018
What is pooled variance?
 
  a. The weighted average of the two sample variances.
  b. The variance of the difference between the sample means.
  c. The sum of the two sample variances.
  d. The variance of the populations from which the samples were drawn.

Question 2

Suppose you tested two age groups on the number of details they could recall from a paragraph. The mean for the older group is 16, and the mean for the younger group is 14 . Further suppose that you fail to reject the null hypothesis for this independent samples t-test. Which of the following best accounts for the difference between these sample means?
 
  a. A math error has been made somewhere.
  b. The null hypothesis was incorrect to start with.
  c. The sample means probably came from different populations, and the difference is due to sampling error.
  d. The sample means probably came from the same population, and the difference is due to sampling error.


cat123

  • Sr. Member
  • ****
  • Posts: 310
Reply #1 on: Jun 20, 2018
Answer to Question 1

A

Answer to Question 2

D


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

Did you know?

Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.

Did you know?

Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

Did you know?

The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."

Did you know?

The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.

Ethnic Differences in Financial Support for College Based on a sample of 304 emerging adults aged 2 Ethnic Differences in Financial Support for College Based on a sample of 304 emerging adults aged 2
Average Global Temperature during the Phanerozoic Average Global Temperature during the Phanerozoic
Sample Teaching Plan for Hypertension Sample Teaching Plan for Hypertension
A medical assistant holds a specimen container to receive a biopsy sample. A medical assistant holds a specimen container to receive a biopsy sample.
The average percentages by polygraph exams The average percentages by polygraph exams
As a result of a hole in the graph, which of the following functions does not have an average ... As a result of a hole in the graph, which of the following functions does not have an average ...
Video: Evolutionary tree of life Animation

For a complete list of videos, visit our video library