week 5 PP's for final - 5th Edition Psy 315 Practice...

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5 th Edition Psy 315 Practice Problems Student Reference Guide: Week 5 Chapter 7, Problem #14 a) Steps of hypothesis testing: 1) Restate the question. Population 1: The individuals in the test. Population 2: People who exhibit a 24-hour cycle of sleeping and waking. Research hypothesis _________Individuals exhibit a cycle of sleeping and waking greater than 24 hours__.________________________________________________________________ ___________________________________________________________________ Null hypothesis ____Individuals exhibit a cycle of sleeping and waking not greater than 24 hours.__________________________________________________________________ _______________________________________________________________________ _ 2) Determine the characteristics of the comparison distribution. Cycles (X) Diff from Mean (X - M) Squared Diff from Mean (X - M) 2 25 0 0 27 2 4 25 0 0 23 -2 4 24 -1 1 25 0 0 26 1 1 25 0 0 =200 (X-M)=0, SD=1.12, Ʃ μ=24, M=25 SS =10 a) Mean (M) = ___25______________ b) df = __7__________ c) mean ( μ ) = _24_____________ d) S 2 = SS/df = 10/7 = 1.428571429 e) S 2 M = (S 2 /N) = 1.428/8=1.43/8=1.78=1.8________________________________ f) S M = 0.1785714286 = _.422=.42= S M = 4.2 _____________________
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g) 3) Determine cutoff sample score using sig. level = .05 and assuming two-tailed test (using Table A-2 on page 668) and df = 7 cutoff t score = _2.365 and +2.365_____________________ 4) Determine sample's score t = (M - μ ) / S M = (24 – 25) / 0.4225771274 = _-2.366431913______________________ 5) Conclusion: The sample's t of _-2.366 (-2.37)_________ is more extreme than the needed _-2.365 (- 2.37)_________. Thus, we can ______reject the________________ null hypothesis . The cycle length under these conditions does not differ from the 24-hour cycle. b) Sketch the distributions involved. Please sketch in the blank provided. c) Explain your answer to someone who has never had a statistics course.____One would calculate a number to find the claim or which is correct to us or which is incorrect by using statistical analysis. To get this number we use the mean, standard deviation and the sample size
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This note was uploaded on 12/29/2011 for the course DFA 3E13 taught by Professor 123 during the Spring '09 term at Abraham Baldwin Agricultural College.

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week 5 PP's for final - 5th Edition Psy 315 Practice...

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