Consider the population of many adults. A researcher hypothesized that the average adult body temperature is lower than the often-advertised 98.6 degrees Fahrenheit. That is, the researcher wants to answer the question: "Is the average adult body temperature 98.6 degrees? Or is it lower?" To answer his research question, the researcher starts by assuming that the average adult body temperature was 98.6 degrees F.Then, the researcher went out and tried to find evidence that refutes the initial assumption. In doing so, the researcher selects a random sample of 130 adults. The average body temperature of the 130 sampled adults is 98.15 degrees with a standard deviation of 2.14.

a. What is the null hypothesis?

b. What is the alternative?

c. Calculate the t-statistic.What is the t-statistic?

d. What do you conclude (note: table provided on the last page of the exam)?