Question 7 (2 points) People of all age groups can be infected by COVID-19. Data were collected from laboratory confirmed COVID-19 cases in Kalamazoo County (as of 3:00 PM April 19, 2020) and are presented below. We are interested in testing (at 5% level of significance) whether the percentage of at least one age group differs significantly from the others. Age Group 0-19 Cases 8 20-29 24 30-39 30 40-49 27 50-59 19 60-69 20 70-79 14 >79 23 Total 165 If the null hypothesis is true, what is the appropriate expected count for the age group 70-79? 22.617 18.075 20.625 15.649 25.513 Question 6 (2 points) People of all age groups can be infected by COVID-19. Data were collected from laboratory confirmed COVID-19 cases in Kalamazoo County (as of 3:00 PM April 19, 2020) and are presented below. We are interested i testing (at 5% level of significance) whether the percentage of at least one age group differs significantly from the others. Age Group Cases 0-19 8 20-29 24 30-39 130 40-49 27 50-59 19 60-69 20 70-79 14 >79 23 Total 165 What are the appropriate null and alternative hypotheses for the Chi-Square test? Hint: What would you expect for a frequency if there was no difference in prevalence among the age groups below. H: P =0.59, P=0.15, P = 0.18, P = 0.16, P = 0.125, P = 0.125, P = 0.125, P = 0.125 HA: At least one proportion differs from what is expected. II: At least one proportion is the same as expected. HA: All the proportions are different from expected. Ho: P =0.125, P = 0.125, P = 0.125, P = 0.125, P = 0.125, P = 0.125, P = 0.125, Pg = 0.125 HA: At least one proportion differs from what is expected. Ho: P = 8, P = 24, P = 30, P = 27, P = 19,P = 20, P = 14, Pg = 23 HA: At least one proportion differs from what is expected. Ho: P = 0.10, P = 0.20, P3 -0.30, P = 0.40, P=0.50 P=0.60, P = 0.70, P = 0.80 HA: At least one proportion differs from what is expected.