Statistics- The null hypothesis which is appropriate for a directional

The null hypothesis
which is appropriate for a directional alternative hypothesis asserts that
____.

	the independent variable has had some effect
	the independent variable has had no effect

	the independent variable does not have an effect in the direction predicted by H1
	chance alone is responsible for the differences between conditions

If alpha equals 0.05
and the probability level of your experiment is 0.04, you would ____.

	reject the null hypothesis
	redo the experiment

	retain the null hypothesis
	accept the null hypothesis

Using the sign test,
if the null hypothesis is false, thenP(the probability of a
plus) ____.

	equals alpha
	is not equal to 0.50

	equals beta
	equals 0.50

If alpha is 0.05 and
obtained probability level is 0.01, you could be making a ____.

	Type II error or correct decision
	Type II error or a Type I error

	Type I error or a correct decision
	Type III error

The alpha level ____.

	is always set at 0.05 or 0.01
	depends on N

	is determined by the consequences of making a Type I and Type II error
	is set after the data are analyzed

Using the sign test,
if (1)H₁is directional, (2)H₀is false, (3)a= 0.01, and (4)N= 12, then the
probability of making a Type I error equals ____.

	0.0002
	0.0010

	0.0192
	0

If you rejectH₀whenH₀is false, you have
made a ____

	Type III error
	Type I error

	Type II error
	correct decision

If the alpha level is
changed from 0.05 to 0.01, what effect does this have on beta?

	beta is unaffected
	beta decreases

	cannot be determined
	beta increases

In a nondirectional
alternative hypothesis, evaluating the probability of observing 7 pluses out of
8 events equals ____.

	p(7) + p(8)
	p(0) + p(8)

	p(0) + p(1) + p(7) + p(8)
	p(7)

Exhibit 10-2

Refer to the following hypothetical data collected using replicated measures
design:

Subject	1	2	3	4	5	6	7	8	9	10
Pre	50	49	37	16	80	42	40	58	31	21
Post	56	50	30	25	90	44	60	71	32	22

Refer to Exhibit 10-2. In a two-tailed test ofH₀usinga= 0.05, what isp(obtained) for the
results shown?

	0.1094
	0.0108

	0.0500
	0.0216

In an experiment in
whichH₁is nondirectional, and the state of reality is
such that the probability of a plus = 0.50, the probability of making a Type II
error is ____.

	0
	1- alpha

	1
	need more information

Maximizing the power
of an experiment ____.

	minimizes beta
	minimizes alpha

	increases the probability of rejecting H0 when H0 is true
	increases the probability of making a Type II error

IfH₁is nondirectional and
the size of the effect of the independent variable decreases, the probability
of making a Type I error ____.

	decreases
	increases

	need more information
	equals zero

If the null hypothesis
is false, the probability of making a correct decision is given by ____.

	1- alpha
	alpha

	beta
	power

You can only compute
power when ____.

	Beta > 0.05
	H1 is given

	1- power = 0.05
	alpha > 0.05