If, in a sample of n=16 selected from a normal? population, x¯=56 and S=20?; the critical values of t if the level of? significance, α,? is 0.05?, the null? hypothesis, H0?, is μ=50, and the alternative? hypothesis, H1, is μ≠50?
The critical values of t are ±
?(Round to four decimal places as? needed.)