A researcher is investigating the IQ of children who have participated in an early childhood education program. She selects 30 of these children at random and tests the IQ of each. The sample mean is 106, and the sample standard deviation is 14. She wants to compute a 95% CI for the population mean. She determines that the critical value of t is 2.045. Which of the following expressions would she use to compute this interval?

Select one:

a.

106 2.045 14/30

b.

106 2.045 14/30

c.

106 2.045 14/30

d.

106 2.045 14