An incubation period is a time between when you contract a virus and when your symptoms start. Assume that the population of incubation periods for a novel coronavirus has the population standard deviation of 2.5 day(s), also assume that the sample is from a normal population. By surveying randomly selected local hospitals, a researcher was able to obtain the following sample of incubation periods of 23 patients:

6	8	5	11	8
9	8	8	10	9
7	8	4	8	10
10	8	11	7	7
12	7	9

(Note: The average and the standard deviation of the data are respectively 8.26 day(s) and 1.91 day(s).)

At 1% significance level, test the claim that the average incubation period of the novel coronavirus is different from 6 day(s).

Procedure: Select an answer One mean T Hypothesis Test One variance χ² Hypothesis Test One mean Z Hypothesis Test One proportion Z Hypothesis Test

Assumptions: (select everything that applies)