Follow the steps in testing the hypothesis to answer the following problems. Show the process in solving. I. The average age of people who have been vaccinated by Pfizer is 45, according to the survey. A researcher believes that it is not 45, so he organizes a census and chooses a random sample of 29 individuals to participate. The researcher found out that the average citizen who received a Pfizer vaccine is 50 years old, with a standard deviation of 20. Using 0.01 level of significance, is there sufficient evidence to conclude that the average of Pfizer vaccinated citizens is not 45?

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