This Question: 10 pts 15 of 2B 1 12 complete) This Test: 280 pts possible Ressar

Question

This Question: 10 pts 15 of 2B 1 12 complete) This Test: 280 pts possible Ressarchers wartad to mmesoure the effect of alcxhsi on the dewelcpmem of 'the hopocampal regon is adousoents. The researchers randomly solectod 14 adclescents with acohot use disonders. They wared ta is rn wherer en po ampal umes in the ach icable ents were loss han the norm volume ot 9.02 cmAn an"yss of the sample data revealed hat he hp pproxmalsly normal wh x 823 and-07.Conduct an appropriatn beet at the 005 level of signtcaroe can alw Choces the corruct btypolhesse 02 02 Find he test stat Cack to mect your answuta) oWERTY OP A S

Explanation / Answer

a) H0: = 9.02 cm

H1 :< 9.02 cm

given x^= 8.23 and s = 0.7 n =14

tstat = x^- / (s/sqrtn) = 8.23-9.02 / (0.7/sqrt14) = -4.2227     rounding = -4.22

since n =14 degress of freedom = 14-1=13

alpha = 0.05 significance critical value value is - 2.160 from standard t table thwe value is found

2 tailed p value = 0.0010

p value is 0.0010/2= 0.0005

option b reject ho as there is sufficient evidence ( -2.160<-4.22)

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