Question

At a certain university, 15% of students fail general chemistry on their first attempt. Professor Brown teaches at this university and believes that the rate of first-time failure in his general chemistry classes is 24%. He samples 75 students from last semester who were first-time enrollees in general chemistry and finds that 11 of them failed his course. i). Sate the appropriate null and alternate hypotheses. ii). Compute the test statistic z. ii). Using a 0.05, can you conclude that the percentage of failures differs from 24%?

Answer 1

Fnds of them failed hts cowse xell 15 n ( Professor Bron believes thet ratc of Fiust-time faflue n his general chemitry classes is 84, so Poz)84. HoRate of frst-ime faitures Ph Professors Broons general chemity classes s 24-/ rofessor Broons geneal chenitry closes differen fom di, Test statistic : PP PCI-P 0.0933 0a4 Ci-o 24) 0493 チ5 マ= -1.8745

ėlį)for α: 025 critical values ofi are -1.960 and朴96.It test Statistic s not n the fnteruol C16, 146reJect to test statistic 8 s n the interval C-196, 6), SD Cbe wft not resect Null hpothesS- ,'' "There t& no sufficient evidence to Concludeot the percentag