The main findings of the study are presented in the following table: the row labeled "Overall" presents an analysis of the outcomes based on all study enrollees, and the subsequent rows under each head so the results separately for different sub-groups."95% CI" is an abbreviation for "95% Confidence Interval. "Number of cases" refers to the total number of Covid-19 infections incurred among participants after receiving the second dose of the 2-dose vaccine regimen.

Suppose you plan to perform a two sample z-test (or log rank test) to compare the Covid-19 outcome between the vaccinated and unvaccinated groups.What is the null hypothesis for this test in terms of the incidence rate ratio (IRR)?

The main findings of the study are presented in the following table: the row labeled "Overall" presents an analysis of the outcomes based on all study enrollees, and the subsequent rows under each head so the results separately for different sub-groups."95% CI" is an abbreviation for "95% Confidence Interval. "Number of cases" refers to the total number of Covid-19 infections incurred among participants after receiving the second dose of the 2-dose vaccine regimen.

Suppose you plan to perform a two sample z-test (or log rank test) to compare the Covid-19 outcome between the vaccinated and unvaccinated groups.What is the null hypothesis for this test in terms of the incidence rate ratio (IRR)?

Ho= IRR null 0

Ho= IRR = 0

Ho IRR null 1

Ho= IRR=1

Suppose you plan to perform a two sample z-test (or log rank test) to compare the Covid-19 outcome between the vaccinated and unvaccinated groups.What is thenull hypothesis for this test in terms of the survival curves for the randomization groups (Svaccine(t) and Splacebo(t))?

Based on the resulting 95% confidence interval for the incidence rate ratio (or its compliment vaccine efficacy, given in the table), what can you ascertain about the p-value from the hypothesis test