Review_Final Exam_Fall 2023 - Tagged

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Psychology

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Jun 22, 2024

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1 Review Questions for Final Exam PSYC 1303 Statistical Methods. Fall 2023. 1. What kind of variable is "Favorite Candy"? (Chapter 2, Section 2) A. Discrete B. Categorical C. Dichotomous D. Continuous 2. What kind of variable is "age" (Chapter 2, Section 2) A. Discrete B. Categorical C. Dichotomous D. Continuous 3. How many values does a dichotomous variable have? (Chapter 2, Section 2) 4. Indicate whether the following variables are numeric or nominal. (Chapter 2, Section 2) a) Discrete ___________ b) Categorical __________ c) Dichotomous __________ d) Continuous ___________ 5. A negatively skewed distribution has .... (Chapter 2, Section 6) A. A long tail pointing to the right B. A long tail pointing to the left C. Equal tails on both sides 6. In a symmetric distribution, what is the z-score of the median? (Chapter 3, Section 2; Chapter 4, Section 2) 7. In a normal distribution, what percentage of scores lie between z = -2.00 and z = 2.00? (Chapter 4, Section 5) 8. If height is normally distributed and Salvador has a z-score of -1.00 for height, what is Salvador's percentile? (Chapter 4, Section 5)

2 9. Describe the relationship between the mean and the median for each of the distributions below. Use the following symbols to describe the relationship: < , > , or = For example: Four > Two Distribution 1: ___________________________________________________ Distribution 2: ___________________________________________________ Distribution 1 Distribution 2

3 10. The histogram above shows the distribution of annual per person expenditures on gasoline in each of the 50 states. (The bar for expenditures between $1,100 and $1,300 is not shown) (Chapter 2, Section 5) a. In what percentage of the states was the expenditure above $1,500? b. What percentage of the states had an hourly wage between $1,300 and $1,600? c. What is the AREA of the missing bar between $1,100 and $1,300? d. What is the HEIGHT of the missing bar between $1,100 and $1,300?

4 11. If a raw score is below the mean and its Distance from the Mean is 7, what is its Deviation? (Chapter 3, Sections 3 & 4) 12. If the mean is 120 and Teresa's raw score is 105, what is her Deviation? (Chapter 3, Section 4) 13. The Standard Deviation of IQ scores is 15. What is the Variance? (Chapter 3, Section 5) 14. High school students spend an average of 1200 hours per year on the internet, with a standard deviation of 150 hours. The number of hours spent on the internet is normally distributed. (Chapter 4, Sections 3-6) a) If Elida's z-score is 1, how many hours does she spend on the internet? b) What is Elida's percentile? Round to nearest whole percentile. [Example: 37%] c) If Carlos spends 1,425 hours per year on the internet, what is his deviation from the mean? d) What is Carlos' z-score ? Round to two decimal places. [Example: 3.25] e) What is Carlos' percentile? Round to one decimal place .[ Example: 74.1% ]

5 15. For the raw scores below, calculate the mean, deviations, squared deviations, variance and standard deviation. (Chapter 3, Sections 4 and 5) Raw score Deviation Squared Deviation 14 ___________ ___________ 24 ___________ ___________ 12 ___________ ___________ 35 ___________ ___________ 28 ___________ ___________ 31 ___________ ___________ Mean: ___________ Variance: __________[Round to two decimal places. Example: 38.33] Standard Deviation: __________ [Round to two decimal places. Example: 6.19]

6 16. A line on a scatterplot passes through the points (8, 7) and (32, 13). (Chapter 5, Sections 2-4) a) What is the line's slope? b) What is the line's intercept? c) What is the equation for the line? d) Are the following points on the line? (24, 11) Yes No (40, 16) Yes No (60, 20) Yes No

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