Author Question: There is a greater risk of making which error with a directional hypothesis? a. Concluding that ... (Read 33 times)

colton

  • Hero Member
  • *****
  • Posts: 627
There is a greater risk of making which error with a directional hypothesis?
 
  a. Concluding that there is a difference between groups when there really is no difference
  b. Concluding that there is no difference between groups when there is an inverse relationship
  c. Concluding that there is no difference between groups when there really is a difference
  d. Rejecting the null hypothesis when the measurement error is moderate

Question 2

Level of significance, sample size, power, and effect size are the four components of:
 
  a. decision theory.
  b. exploratory analysis.
  c. inference.
  d. power analysis.



hanadaa

  • Sr. Member
  • ****
  • Posts: 339
Answer to Question 1

ANS: A
In a one-tailed test of significance, the hypothesis is directional. One-tailed statistical tests are uniformly more powerful than two-tailed tests, decreasing the possibility of a Type II error (saying there is no difference when there really is). This means the likelihood of a Type I error (saying there is a difference when there really is not) increases.
Concluding that there is no difference between groups when there is an inverse relationship is a Type II error.
Concluding that there is no difference between groups when there is an inverse relationship describes a Type II error.
Rejecting the null hypothesis when the measurement error is moderate would be true of both directional and nondirectional hypotheses.

Answer to Question 2

ANS: D
Cohen identified four parameters of a power analysis: the level of significance, sample size, power, and effect size.
The four components do not constitute decision theory.
Exploratory analysis is a preliminary step in the analysis of data.
Inference is the conclusion or judgment based on evidence.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.

Did you know?

Lower drug doses for elderly patients should be used first, with titrations of the dose as tolerated to prevent unwanted drug-related pharmacodynamic effects.

Did you know?

Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.

Did you know?

Coca-Cola originally used coca leaves and caffeine from the African kola nut. It was advertised as a therapeutic agent and "pickerupper." Eventually, its formulation was changed, and the coca leaves were removed because of the effects of regulation on cocaine-related products.

Did you know?

To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.

For a complete list of videos, visit our video library