Chapter 16 Multiple choice questions

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1. Calculate d' for a yes/no condition in which there were a total of 83 hits out of 90 signal present trials and 8 correct rejections out of 10 signal absent trials.

1.42 correct incorrect

0.84 correct incorrect

0.58 correct incorrect

2.26 correct incorrect

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2. What is the bias (C) for the scenario described in Question 1?

-0.29 correct incorrect

0.29 correct incorrect

-1.13 correct incorrect

1.13 correct incorrect

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3. Calculate d' for a 2AFC experiment in which 81% of trials were correct.

0.88 correct incorrect

1.24 correct incorrect

1.76 correct incorrect

1.15 correct incorrect

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4. What is the d' value for a 2AFC experiment in which 75 trials out of 75 were correct?

1 correct incorrect

0 correct incorrect

Infinity correct incorrect

Not-a-number correct incorrect

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5. Approximately how many trials were correct in a 2AFC experiment where d' = 0.7, and there were 208 trials in total?

143 correct incorrect

70 correct incorrect

146 correct incorrect

158 correct incorrect

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6. For a yes/no experiment in which 40/50 signal present trials were correct, what was the false alarm rate if d' = 0.6?

0.24 correct incorrect

0.84 correct incorrect

0.59 correct incorrect

0.73 correct incorrect

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7. Use the dprime.mAFC function from the psyphy package to calculate d' for a 9AFC experiment in which 55% of trials were correct.

0.18 correct incorrect

0.72 correct incorrect

1.17 correct incorrect

1.56 correct incorrect

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8. In a yes/no task, participant 1 gets 72 out of 90 signal present trials correct and 33 out of 45 signal absent trials correct. Participant 2 gets 78 out of 90 signal present trials correct, and 26 out of 45 signal absent trials correct. Which participant is more sensitive?

Participant 1 correct incorrect

Participant 2 correct incorrect

Both are equally sensitive correct incorrect

We cannot tell without knowing the false alarm rate as well correct incorrect

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9. For the scenario described in Question 8, which participant is more biased?

Participant 1 correct incorrect

Participant 2 correct incorrect

Both are equally biased correct incorrect

The participants show the same amount of bias in opposite directions correct incorrect

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10. An experiment samples two points on an ROC curve as follows:
Point 1: hits = 0.8, false alarms = 0.4
Point 2: hits = 0.4, false alarms = 0.15
What is the most likely value of d'?

1.09 correct incorrect

0.78 correct incorrect

0.94 correct incorrect

0.86 correct incorrect