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000 AT&T; LTE 9:22 AM 90% mathxl.com Wh Weekend... Shop Youn. to MyADP Ims.ssc.ed... McGraw-H Homework Do Hom MTH 126-301, Fall 2017 Lisa Koscielski 11/12/17 9:22 AM Homework: Section 8.2 Homework Save Score: 2 of 4 pts 10 of 10 (10 complete) HW Score: 81.54%, 36.69 of 45 pts 8.2.41 Question Help It was determined that the percentage of rs in the Engish language ", the 1800s was 1 1%, Arandom sample of 1000 letters from a current newspaper contained 123 rs. Test the hypothesis that the proportion of t's has changed in modern times, using the 0.05 level of significance. Treat the newspaper as a random sample of all letters State the nul and alternative hypotheses. OA Ho:p=0.11 :p 0.11 Ha p 011 H,: p-0.11 D. Ho P 0.11 Ha:p

Explanation / Answer

p = 0.123

standard error = sqrt ( p * (1-p)/n)

= sqrt( 0.123 * (1-0.123)/1000)

= 0.010386

test static = X -x -bar/standard error

= 0.11 - 0.123/0.010386

= -1.25

p-value = 0.211

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