STAT 245 Study Guide - Final Guide: Osteoarthritis, F-Distribution, Statistical Hypothesis Testing
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This comes from altman, p. 233, citing a study by lewith and machin. How many subjects would you recommend having in each group for this second experiment: compare four tables, what are the 2-sided critical values for a normal distribution for. =0. 05 and =0. 10 , one degree of freedom in the numerator, and a large number of degrees of freedom in the denominator? problem set 02 - with answers. 2019-07-14: this comes from altman, p. 233, citing a study by lewith and. Infrared stimulation (irs) and a placebo were compared with respect to treating pain of cervical osteoarthrosis. Twenty-six subjects started the program, but one dropped out early. Here are the results w. r. t. reporting an improvement (i. e. , less pain): Irs (treatment) n1=12 m1=9 (improved) placebo (a simulated treatment) n2=13 m2=4. Perform a hypothesis test comparing the two proportions. Ans: (the solution in the altman book uses pooled values to compute the standard error. Also, there is discussion of a continuity correction factor.
