Exam 3

With an alpha level of .05one-tail, the value of tcrit = 1.645 when df = infinity.

Power DOES NOT DIFFER for different sizes of effect

Correlated groups and independent groups t tests DO NOT require population parameters

We never "accept" the null hypothesis, but instead "fail to reject" or "retain" it.

The value of zcrit for alpha = .05one-tail is ___________.

When the df = ∞, the t distribution _____.

The proper use of the t test requires that:

What are the two basic steps involved in anaylzing data?

The sampling distribution of a statistic gives (check all that apply):

In a correlated groups design

Which of the following apply to the sampling distribution of the mean?

We estimate the population standard deviation (σ) with what?

Data analysis involving statistical inference basically involves ______.

Power DOES NOT vary directly with sample size (N), real effect, and the alpha level

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

The sign test ignores MAGNITUDE of the difference scores and only considers DIRECTION

The sampling distribution of the mean is a distribution of sample mean scores

The Null Hypothesis is denoted as:

Cohen's d is:

Alpha is the probability of limiting a _____

The sampling distribution of the mean is the only sampling distribution used in inferential statistics.

If the alternative hypothesis states that alcohol affects short-term memory, the null hypothesis states _____.

The sampling distribution of a statistic _______.

The Alternative Hypothesis is denoted as:

Beta is the probability of limiting ___.

If alpha is changed from .05 to .01,

In an experiment, if the effect of the independent variable and alpha remain the sameand N increases:

σ_{\overline{x}} represents which one of the following?

A potential feature of the independent groups design is:

In the sign test (and in the binomial examples we have used), if the null hypothesis is true, then P

Power + Beta = _____.

When the ____ hypothesis is true, the sampling distribution of differences will havean average value of ___.

A teacher predicts quiz scores to INCREASE with time studied. This is an example of which type of hypothesis?

Power =

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

A 99% confidence interval will be narrower than a 95% confidence interval.

If alpha equals .05, and the probability level of your study is .04, you would:

Decision to retain H0 when it is false:

If zobt was 2.60 and zcrit was 2.58, one would:

In a sampling distribution, N = ______

The mean of the sampling distribution of the mean equals ____.

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

In an experiment, if the sample means differ significantly, then ____.

The central limit theorem states that the sampling distribution of the mean

The value of zcrit for alpha = .05two-tail is ___________.

The number of values that are free to vary in calculating a statistic is known as the:

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

Do we use a one or a two-tailed test with a nondirectional alternative hypothesis?

T is a ______ of distributions (curves).

If Ho is false the probability of making a correct decision is

The ________ value of a statistic is the value of the statistic that bounds the critical region.

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

Decision to reject H₀ when it is true:

When the results are statistically significant, this means that __________.

You are given N, μ, s, x̄. Which test would you use under these circumstances?

A major advantage of the two-group study/experiment (i.e., treatment & control) is:

For a given value of alpha, the absolute value of tcrit is generally ____ than the valueof zcrit.

The sampling distribution of the mean has a mean equal to the mean of the raw score population μ_{\overline{x}}=μ_x

β =

The requirement that at least one population parameter must be specified is a major limitation of ____________.

A gardener predicts plant growth will be AFFECTED by a new fertilizer. This is an example of which type of hypothesis?

For the z test, the critical region for rejection of Ho __________.

Power can vary from:

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

When Ho is true, the expected t values are symmetrically distributed around a value ___

In the normal deviate z test, you DO NOT know population parameters

The range of values that is likely to contain the population value is:

Another name for a correlated groups design is:

The area under the critical region must

You are given N, μ, x̄, σ. Which test would you use under these circumstances?

When the results of a study are nonsignificant, the proper conclusion(s) is (are).

The Alternative and Null Hypotheses are NOT mutually exclusive and exhaustive.

If alpha is .05 and the obtained probability level is .01, you could be making a

If your obtained probability is less than your alpha level, you reject this

This is set by the researcher at the beginning of the experiment to limit the probability of a Type I error

The __ is an actual or theoretical set of population scores that would result if the independent variable had no effect.

This claims that differences in results are due to the INDEPENDENT variable

The higher the power, the more sensitive the experiment is to detect a real effect of the independent variable.