Next Page Pa Question 4 (6 points) Saved [6 marks] An epidemiologist wanted to investigate whether the mRNA vaccine was effed against the emerging delta variant of COVID-19 virus. In particular, the epidemiologist w find out if there was a relationship between mRNA dosage (no dose, single dose, two do being infected with the delta variant. A simple random sample of 500 Canadians was sele study this. The results are summarized in the following table. Infected with mRNA vaccine dose COVID-19 delta Total variant No dose Single dose Two doses Yes B2 100 11 143 No 10 225 122 537 Total 42 325 183 500 a) [2 marks] Calculate the expected frequency of the cell "No and no dose" and provide an interpretation of its value in the context of the problem. b) [4 marks] The chi-square statistic is 74 2. Can the researcher conclude that be infected with the delta variant is independent to mRNA vaccine does? Clearly sho the steps of hypothesis testing and use an appropriate decision point value to support your conclusion