Week2_10_8_08

Week2_10_8_08 - b. Find the z score for each score in the...

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Psych 100A Fall 2008 10/8/08 Homework Wk 2 All the assignments are in the Kiess textbook, if not otherwise specified. (1) Testing your knowledge 6.2: on page 111 (2) Testing your knowledge 6.3: 2 on page 119 (3) Review questions 6: 3 g on page 122 (4) Review questions 6: 5 on page 123 (5) Define: Sample Mean Distribution. (6) Define: Sampling Distribution. (7) Why perform random sampling from a population? NOT in Kiess text book: (1) I collected the exam scores from the 12 students in my class. Their scores are as follows: 50, 70, 65, 105, 90, 60, 85, 80, 55, 75, 95, and 100. a.) Find the mean and standard deviation for this distribution. b.) Calculate the standardized scores for all 12 of the scores in the distribution. c.) Which scores were > the 90 th percentile? (2) A population consists of the following N = 6 scores: 0, 4, 6, 1, 3, and 4. a. Compute µ and σ for the population.
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Unformatted text preview: b. Find the z score for each score in the population. c. Transform the original population into a new population of N = 6 scores with a mean of = 50 and a standard deviation of = 10. (3) For a normal distribution with a mean of 80 and a standard deviation of 10, find each probability value requested. a. p (X > 85) = ? b. p (X < 95) = ? c. p (X > 70) = ? d. p (75 < X < 100) = ? Answers for questions Not in Kiess book 1.) a.) = 77.5, = 17.26 b.) c.) 100 and 105 were > 90%. 2.) a.) = 3 and = 2 b & c (see table below) Origin al X z-score Transform ed X-1.5 33 4 0.5 55 6 1.5 65 1-1 40 3 50 4 0.5 55 3.) a. p = 0.3085 (30.85%) b. p = 0.9332 (93.32%) c. p = 0.8413 (84.13%) d. p = 0.6687 (66.87%) X z-score 105 1.59 100 1.30 95 1.01 90 0.72 85 0.43 80 0.14 75-0.14 70-0.43 65-0.72 60-1.01 55-1.30 50-1.59...
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Week2_10_8_08 - b. Find the z score for each score in the...

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