- Text
- Population,
- Variance,
- Colorful,
- Hypothesis,
- Wallpaper,
- Maze,
- Trials,
- Psychologist,
- Experimental,
- Satisfaction,
- Statistical,
- Reasoning,
- Psychology

• C. the same as the orig**in**al population mean. • D. the sample mean multiplied by the variance. Question 4 of 20 5.0/ 5.0 Po**in**ts An experimental psychologist is **in**terested **in** whether the color of an animal's surround**in**gs affects learn**in**g rate. He tests 16 rats **in** a box with colorful wallpaper. The average rat (of this stra**in**) can learn to run this type of maze **in** a box without any special color**in**g **in** an average of 25 trials, with a variance of 64, and a normal distribution. The mean number of trials to learn the maze, for the rats tested with the colorful wallpaper, is 11. What is the μ M ? • A. 8 • B. 11 • C. 25 • D. 64 Question 5 of 20 0.0/ 5.0 Po**in**ts Which of the follow**in**g statements regard**in**g confidence **in**tervals is FALSE? • A. Confidence **in**tervals are misused more often than significance tests. • B. Confidence **in**tervals can be used **in** hypothesis test**in**g. • C. Confidence **in**tervals emphasize numerical estimates. • D. Confidence **in**tervals are sometimes reported **in** research articles. Question 6 of 20 5.0/ 5.0 Po**in**ts A 95% confidence **in**terval is figured by f**in**d**in**g: • A. the Z score for the bottom 5% of the distribution. • B. the Z score for the upper 95% of the distribution. • C. the cutoff po**in**ts for the lower 2.5% and the upper 2.5% of the distribution. • D. the cutoff po**in**ts for the lower 5% and the upper 5% of the distribution. Question 7 of 20 5.0/ 5.0 Po**in**ts Some psychologists have argued that simple significance tests are mislead**in**g, and that a better statistic to evaluate the outcome of an experiment would be the: • A. effect size. • B. level of power. • C. probability of a Type II error. • D. number of participants divided by the standard deviation. Question 8 of 20 5.0/ 5.0 Po**in**ts The standard deviation of a distribution of means is:

• A. figured by subtract**in**g the variance from the sample mean and tak**in**g the square root. • B. the square root of the variance of the distribution of means. • C. the population variance divided by the N **in** each sample. • D. the same as the square root of the sample variance. Question 9 of 20 5.0/ 5.0 Po**in**ts When conduct**in**g an experiment with 95% power, fail**in**g to reject the null hypothesis means that: • A. there is no difference between the experimental and control populations. • B. the experiment was poorly conducted. • C. the null hypothesis is true. • D. the chance that the data came from populations with a difference larger than that predicted when calculat**in**g power is less than 5%. Question 10 of 20 0.0/ 5.0 Po**in**ts An experimental psychologist is **in**terested **in** whether the color of an animal's surround**in**gs affects learn**in**g rate. He tests 16 rats **in** a box with colorful wallpaper. The average rat (of this stra**in**) can learn to run this type of maze **in** a box without any special color**in**g **in** an average of 25 trials, with a variance of 64, and a normal distribution. The mean number of trials to learn the maze, for the rats tested with the colorful wallpaper, is 11. What is σ M ? • A. 64/16 = 4.00 • B. √(64/16) = 2.00 • C. 64/11 = 5.82 • D. √(64/11) = 2.41 Question 11 of 20 5.0/ 5.0 Po**in**ts Power is the probability that: • A. if the research hypothesis is false, the experiment will support the null hypothesis. • B. if the research hypothesis is true, the experiment will support it. • C. a Type I error will not be made. • D. the research hypothesis will not be accepted **in**correctly. Question 12 of 20 5.0/ 5.0 Po**in**ts An experimental psychologist is **in**terested **in** whether the color of an animal's surround**in**gs affects learn**in**g rate. He tests 16 rats **in** a box with colorful wallpaper. The average rat (of this stra**in**) can learn to run this type of maze **in** a box without any special color**in**g **in** an average of 25 trials, with a variance of 64, and a normal distribution. The mean number of trials to learn the maze, for the rats tested with the colorful wallpaper, is 11. What is the null hypothesis? •

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