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Stat Tutor

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1:19

Incorrect. Errors are possible in any decision making process.

Correct. Errors are possible in any decision making process.

Incorrect. Try again.

2

2:19

What errors could a jury make in deciding whether a defendant is innocent or guilty? Check all that apply.

3hMJDRP6OS+3EJIba. Deciding a defendant is guilty when he is guilty.

wg8JNehuALfILP6Sb. Deciding a defendant is guilty when he is innocent.

wg8JNehuALfILP6Sc. Deciding a defendant is not guilty when he is guilty.

3hMJDRP6OS+3EJIbd. Deciding a defendant is not guilty when he is innocent.

Incorrect. Deciding a defendant is guilty when he is innocent or deciding he is not guilty when he is guilty are both errors that could be made by the jury.

Correct. Deciding a defendant is guilty when he is innocent or deciding he is not guilty when he is guilty are both errors that could be made by the jury.

Incorrect. Try again.

2

4:26

Incorrect. In the United States, the null hypothesis is that the defendant is innocent.

Correct. In the United States, the null hypothesis is that the defendant is innocent.

Incorrect. Try again.

2

5:16

Which of the following are correct decisions? Check all that apply.

wg8JNehuALfILP6Sa. Deciding a defendant is guilty when he is guilty.

3hMJDRP6OS+3EJIbb. Deciding a defendant is guilty when he is innocent.

3hMJDRP6OS+3EJIbc. Deciding a defendant is not guilty when he is guilty.

wg8JNehuALfILP6Sd. Deciding a defendant is not guilty when he is innocent.

Incorrect. Deciding a defendant is guilty when he is guilty or deciding he is not guilty when he is innocent are both correct decisions.

Correct. Deciding a defendant is guilty when he is guilty or deciding he is not guilty when he is innocent are both correct decisions.

Incorrect. Try again.

2

6:24

Incorrect. A type I error occurs when a correct null hypothesis is rejected.

Correct. A type I error occurs when a correct null hypothesis is rejected.

Incorrect. Try again.

2

8:04

Incorrect. The jury declared Bishop guilty when she was really innocent. Thus, she was hung when she should have been set free.

Correct. The jury declared Bishop guilty when she was really innocent. Thus, she was hung when she should have been set free.

Incorrect. Try again.

2

12:30

Incorrect. A type I error is made by rejecting H_{0} when it is correct. In this case, you would reject H_{0} and conclude that the brownies are done when H_{0} is correct and the brownies are NOT done.

Correct. A type I error is made by rejecting H_{0} when it is correct. In this case, you would reject H_{0} and conclude that the brownies are done when H_{0} is correct and the brownies are NOT done.

Incorrect. Try again.

2

Incorrect. A type II error is made by failing to reject H_{0} when it is incorrect. In this case, you would stay with H_{0} and conclude that the brownies are NOT done when H_{0} is incorrect and the brownies really are done.

Correct. A type II error is made by failing to reject H_{0} when it is incorrect. In this case, you would stay with H_{0} and conclude that the brownies are NOT done when H_{0} is incorrect and the brownies really are done.

Incorrect. Try again.

2

Incorrect. Deciding that the brownies are done when they are not results in underdone, gooey brownies.

Correct. Deciding that the brownies are done when they are not results in underdone, gooey brownies.

Incorrect. Try again.

2

13:32

Incorrect. A type I error is only possible if you reject H_{0}.

Correct. A type I error is only possible if you reject H_{0}.

Incorrect. Try again.

2

Incorrect. A type I error is only possible if you reject H_{0}.

Correct. A type I error is only possible if you reject H_{0}.

Incorrect. Try again.

2

Incorrect. A type I error can only occur when you reject H_{0} and a type II error can only occur when you fail to reject H_{0}. Since you cannot both reject H_{0} and fail to reject H_{0} at the same time, you cannot make a type I error and a type II error at the same time.

Correct. A type I error can only occur when you reject H_{0} and a type II error can only occur when you fail to reject H_{0}. Since you cannot both reject H_{0} and fail to reject H_{0} at the same time, you cannot make a type I error and a type II error at the same time.

Incorrect. Try again.

2

15:30

Incorrect. α is the symbol for level of significance and is the probability of making a type I error.

Correct. α is the symbol for level of significance and is the probability of making a type I error.

Incorrect. Try again.

2

Incorrect. Power is defined as the probability of rejecting the null hypothesis when it is wrong.

Correct. Power is defined as the probability of rejecting the null hypothesis when it is wrong.

Incorrect. Try again.

2

17:34

Incorrect. For fixed sample size, increasing α decreases the probability of making a type II error.

Correct. For fixed sample size, increasing α decreases the probability of making a type II error.

Incorrect. Try again.

2

Incorrect. For fixed α, increasing sample size increases power.

Correct. For fixed α, increasing sample size increases power.

Incorrect. Try again.

2

Which of the following increases power? Select all that apply.

wg8JNehuALfILP6Sa. Increasing α

3hMJDRP6OS+3EJIbb. Decreasing α

wg8JNehuALfILP6Sc. Increasing sample size

3hMJDRP6OS+3EJIbd. Decreasing sample size

Incorrect. Increasing either α or sample size increases power.

Correct. Increasing either α or sample size increases power.

Incorrect. Try again.

2

17:58

Incorrect. α is the symbol for *probability* of making a type I error, not just making a type I error.

Correct. α is the symbol for *probability* of making a type I error, not just making a type I error.

Incorrect. Try again.

2