According to a survey, the average American person exercises3

hours per week. To test if the amount of exercise in New York City is more than the national average, a researcher decides to do a hypothesis test, at a10%

significance level. He surveys23

New Yorkers randomly and asks them about their amount of exercise each week, on average. From the data, the sample mean time is3.8

hours per week, and the sample standard deviation (s

) is0.9

hours.

• H
• 0
• :3
• ;H
• a
• :>3
• .
• =0.1
• (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.