Final answer:
The null hypothesis concerning the change in the 24-hour case-fatality rate from 2000 to 2010 states that there is no change in the rate. Other questions require specific data for computing frequencies, percentages, relative frequencies, and cumulative relative frequencies.
Step-by-step explanation:
The null hypothesis regarding the change in the 24-hour case-fatality rate from 2000 to 2010 is C) There is no change in the case-fatality rate. In hypothesis testing, the null hypothesis typically states that there is no effect or no difference, which in this context would mean that the case-fatality rate has remained the same over the given period.
For the questions on frequency, percentage, and relative frequency of deaths over various years, each requires specific data to be answered accurately. For instance, to determine the frequency of deaths measured between certain years, we have to count the number of deaths that occurred during that span. To calculate the percentage of deaths, we divide the number of deaths in a specific period by the total number of deaths and then multiply by 100. Relative frequency is found by dividing the number of deaths in a certain period by the total number of deaths. A cumulative relative frequency for a particular year includes the relative frequencies of all years up to and including that year, which provides insight into the proportion of data points below a certain value.