A company in Calgary has just developed a new Mrna vaccine that is equally effective against covid as the Pfizer and Moderna vaccines. However, Health Canada is concerned about the variability in the amount of time until the vaccine becomes effective. The moderna and Pfizer vaccines take 14 days on average to become effective, with a variance of 30 days squared.

The data file for this quiz contains a random sample of 12 people who received the Calgary vax and how long it took for antibodies to be produced.

Estimate with 90% confidence the variance of the time for the Calgary vaccination to become effective.