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Students who get more sleep get better grades. You want to estimate the hours of sleep...

Students who get more sleep get better grades. You want to estimate the hours of sleep per night that a college student gets. You select 29 students; on average they slept 6.2 hours with a standard deviation of 1.8 hours. The standard error is 0.334. In order to be 90% confident of an estimate of the population mean, what is the critical value?

A- 1.640

B- 1.960

C- 1.699

D- 1.701

E- 2.064

math   Statistics-And-Probability   
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