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.
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