# Understanding Statistics In the Behavioral Sciences 10th Edition By Robert – Test Bank

**TEST QUESTIONS**

__Multiple Choice__

- With alpha and the effect of the independent variable held constant, as
*N*increases _________. - power increases
- the probability of a Type I error increases
- Â Â the probability of a Type II error increases
- power decreases

ANS: a

**Â **

- With alpha and
*N*held constant, as the effect of the independent variable increases _________.

- The probability of rejecting
*H*_{0}increases - power increases
- the probability of rejecting
*H*_{0}remains the same - the probability of making a Type II error decreases
- a, b, and d
- a and b

ANS: b

**Â **

- With the effect of the independent variable and
*N*held constant, as*a*gets more stringent _________. - power increases
- power stays the same
- power decreases
- beta decreases

ANS: c

**Â **

- The advantage of a powerful experiment is that _________.
- the probability of a Type I error is reduced.
- you are more likely to detect the real effects of the independent variable, if there are any.
- as power increases, alpha increases.
- as power increases,
*N*increases

ANS: b

**Â **

- If
*H*_{0}is in reality false and it is legitimate to use a directional*H*_{1}, which of the following will yield a more powerful test? - one-tailed alternative hypothesis
- two-tailed alternative hypothesis
- one-tailed or two-tailed alternative hypothesis will yield the same power
- type of alternative hypothesis has no effect on power

ANS: a

**Â **

- If
*H*_{0}is true and the probability of making a Type I error is 0.05, then the probability of making a correct decision is _________. - power
- 0.05
- 0.95
- need more information

ANS: c

**Â **

- In an experiment in which
*H*_{1}is 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 _________. - 1 – alpha
- 0
- 1
- need more information

ANS: b

**Â **

- Maximizing the power of an experiment _________.
- minimizes alpha
- minimizes beta
- increases the probability of rejecting
*H*_{0}when*H*_{0}is true - increases the probability of making a Type II error

ANS: b

**Â **

- If
*H*_{0}is true, then the probability of rejecting*H*_{0}is limited by _________. - Power
- 1 – power
- alpha
- beta

ANS: c

- Which of the following values of P represents the largest effect?
*P*_{real}= 0.20*P*_{real}= 0.70*P*_{real}= 0.75*P*_{null}= 0.50

ANS: a

**Â **

- If
*N*= 4,*P*_{real}= 0.80 in the direction predicted, and*a*= 0.05_{1 tail}, using the sign test, the power is _________. - 0.9375
- 0.0000
- 1.0000
- 0.0625

ANS: b

**Â **

- If
*H*_{1}is nondirectional and the size of the effect of the independent variable decreases, the probability of making a Type I error _________. - decreases
- increases
- equals zero

- need more information

ANS: c

**Â **

- With other factors held constant, as the effect of the independent variable decreases, power will _________ and the probability of a Type II error will _________.
- decrease, increase
- decrease, decrease
- increase, decrease
- increase, increase

ANS: a

**Â **

- The power of an experiment is affected by _________.
- the alpha level
- the sample size
- the size of effect of the independent variable
- all of the above

ANS: d

**Â **

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

- beta
- 1 – alpha
- power

ANS: d

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