reading quiz 11

Question 1

Statistical power is defined as the probability that the results of an experiment will:

Answer 1

allow rejection of H0 if the independent variable has a real effect.

Question 2

According to the textbook, experiments with power as high as ____ are desirable but rarely seen in the behavioral sciences.

Answer 2

.80

Question 3

According to the textbook, a power analysis can be particularly useful in the following two circumstances:

Answer 3

• interpreting results when the null hypothesis is retained
• initially designing an experiment to determine the number of participants required

Question 4

true or false

Holding other factors constant, increasing the sample size (N) will increase power.

Answer 4

True

Question 5

true or false

Holding other factors constant, increasing the size of the real effect will increase power.

Answer 5

True

Question 6

true or false

The textbook provides an example in which, despite having 100% pluses in the sample, the sample is too small to allow rejection of H0 using the sign test.

Answer 6

True

Question 7

As the power of an experiment increases, the probability of making a Type II error ___________________.

Answer 7

decreases

Question 8

Power + Beta = ___.

Answer 8

1

Question 9

Power _________ with more stringent alpha levels (e.g., using alpha = .01 instead of alpha = .05).

Answer 9

decreases

Question 10

You conduct a small, single experiment and are unable to reject H0. Of the following, the most plausible interpretation is that _________________________.

Answer 10

there may have been inadequate power to detect a small but real effect