SamFinans

# SamFinans - √ 8(b Other things might aﬀect power...

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Brief Answers for Final Exam 1. (a) p = true proportion of drivers 65 years of age or older who think persons in their age group should be tested before liscence renewal. H a : p > 0 . 5 H o : p = 0 . 5 . (b) z > 2 . 05 (or z > 2 . 06) (c) 225 382 - . 5 ( . 5)( . 5) 382 (d) Conclude @ the .02 level that a majority of drivers 65 years of age or older think persons in their age group should be tested before liscence renewal 2. Estimate p 1 . 96 ( . 2)( . 8) n = . 02 or n = 1537 3. (a) 33 172 - 44 163 ± 1 . 96 ( 33 172 )( 139 172 ) 172 + ( 44 163 )( 119 163 ) 163 (b) (i) F (ii) T (iii) F 4. (a) Two tailed t - test, 19 df. . 05 < p - value < . 10 (b) (i) .10 (or any other single value greater than . 10) (ii) .03 (or any other single value less than . 05) (iii) .07 (or any other single value bigger than .05 but less than . 10) 5. (a) T (b) F (c) T (d) T (e) F (f) T (g) F 6. .775 7. (a) 27 . 25 ±

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Unformatted text preview: √ 8 (b) Other things might aﬀect power readings : Manufacturer, age, inherent quality of the tube, etc. (c) (i) 50.99 (ii) Yes!! All of the believable values for the diﬀerence are positive. 1 (d) Diﬀerences in power level readings approximately normally distributed for tubes of the type used. 8. (a) .3085 (b) .9987 9. μ 1 = mean decrease in BP for ALL men given calcium μ 2 = mean decrease in BP for ALL men given placebo (a) H a : μ 1-μ 2 > H : μ 1-μ 2 = 0 (b) t > 1 . 729 (c) t = 5-(-. 273)-r s 2 p ± 1 10 + 1 11 ² where s 2 p = 9(76 . 44) + 10(34 . 82) 19 (d) Cannot claim a larger mean decrease in BP using calcium. 2...
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