Physicians say that the normal temperature of a person's body is 37°C. In a sample of 8 adults, the average temperature a day after COVID-19 booster was given is found to be 37.8 °C with a standard deviation of 1 °C. a. What is the appropriate degrees of freedom? [Select] b. What is the 90% confidence interval for the true mean temperature of adults one day after COVID-19 booster was given? [Select] c. Based on the constructed 90% confidence interval, is there a significant difference between the normal temperature and the true mean temperature of adults one day after COVID-19 booster was given? Why?

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