Betty, an employee of Shining Sun Daycare Center, read an article in Healthy Child Magazine saying that the average 3-year-old child is 37 in. tall. Betty works with 3-year-olds at Shining Sun, so later that week, she measured the height of each child who had just turned or was about to turn 3 years old. Here are their heights in inches: 41, 40, 36, 42, 39, 38, 33, 44, 39, 41.
a. State the nondirectional hypothesis.
b. Determine the critical t for α = .05.
c. Calculate t. Show your calculations.
d. Is the height of 3-year-olds in Shining Sun Daycare Center significantly different from the height given in the magazine?