According to the CDC, the mean height of adults ages 20 and older is about 66.5 inches (69.3 inches for males, 63.8 inches for females). Let's test if the mean height of our sample data, n = 60, is significantly higher than the assumed population mean of 66.5 inches. The observed sample average height is 68 inches and the standard deviation is 5.5 inches.
Group of answer choices
a. .02
b. .39
c. .98
d. .61