A researcher tries to compare grades earned on the first qui

A researcher tries to compare grades earned on the first quiz by boys and girls. He randomly chooses 10 students from boys and 15 students from girls and calculates the confidence interval on difference between means. How many degrees of freedom will you get in this t distribution?

Solution

Q6

DF=n1+n2-2 = 10+15-2 = 23

Answer: 23

Q7

margin of error = (99-98)/2 = 0.5

Answer: 0.5%