According to a survey, the average American person sleeps for8

hours per day. To test if the amount sleep in New York City is less than the national average, a researcher decides to do a hypothesis test, at a1%

significance level. He surveys23

New Yorkers randomly and asks them about their amount of sleep each day, on average. From the data, the sample mean time is7.4

hours per day, and the sample standard deviation (s

) is0.9

hours.

• H
• 0
• :8
• ;H
• a
• :>8
• .
• =0.01
• (significance level)

What is the test statistic (t

-value) of this one-mean hypothesis test (with

unknown)?

• Round your final answer to two decimal places.