Vendors of hearing aids test them by having patients listen to lists of words and repeat what they hear. A researcher investigated four different word lists used in hearing assessment. She wanted to know whether the lists were equally difficult to understand in the presence of a noisy background. To find out, 507 she tested 24 subjects with normal hearing and measured the number of words perceived correctly in the presence of background noise. Here are the 40- boxplots of the four lists. Complete parts a through c. Hearing (% of words) Mean Square F-ratio 30- Source DF Sum of Squares P-value Teller 3 388.527 129.509 2.2895 0.0836. Error 92 5204.072 56.566 10 2 3 Total 95 5592.599 List a) What are the null and alternative hypotheses? OA. HO: H1 = H2 = H3 = H4 OB. Ho: My

H3 and H3

H3 OD. Ho: H2 > M3, HA: H2 = H3 O E. Ho: not all means are equal OF. HO: M1 = H2 = H3 = H4 HA : H1 = H2 = H3 = H4 HA: H1

H3 and H3