reading quiz 13

Question 1

four answers

To use the single-sample t test, the following values must be known:

Answer 1

• the population mean
• the sample size
• the sample standard deviation
• the sample mean

Question 2

The sample standard deviation, divided by the square root of N, results in the _____________________________.

Answer 2

estimated standard error of the mean

Question 3

The _____________ for any statistic is the number of scores that are free to vary when calculating that statistic.

Answer 3

degrees of freedom

Question 4

three answers

Which of the following statements are true regarding the t distribution?

Answer 4

• The shape of the distribution varies by the number of degrees of freedom.
• The t distribution is symmetrical around a mean of zero.
• The t distribution approaches the shape of a normal curve as the number of degrees of freedom increases.

Question 5

The degrees of freedom for a single-sample t test are calculated as __________________.

Answer 5

N - 1

Question 6

When conducting hypothesis testing with a single-sample t test, if |tobt| ≥ |tcrit|, you would _________________________.

Answer 6

reject the null hypothesis

Question 7

two answers

For the sampling distribution of X-bar to be considered normal, at least one of two conditions must be met. Select the two conditions from the four below.

Answer 7

• N ≥ 30
• The population of raw scores must be normal.

Question 8

Cohen’s d is used to ___________________________.

Answer 8

determine the magnitude of a real effect

Question 9

The 95% confidence interval is an interval such that ________________________.

Answer 9

the probability is .95 that the interval contains the population value

Question 10

As the size of the real effect increases, the value of Cohen’s d __________________.

Answer 10

increases as well