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Plug and play method for the formula

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49 tests are made of a material the result is Xbar of 2.4 with a variance of (s^2) 0.4. In the standard the value of Xbar is 3.0. What is the calculated value of t? When I calculated it using an online calculator and my TI 84 + calculator, I and the web site (https://www.statskingdom.com/130MeanT1.html) got a T Value of 10.5. When my teacher did it by hand and myself subsequently using the plug and play method for the formula t = x bar- µ0/s/square root of n, we both got a t-value of 6.7. Why?

Reference no: EM132394874

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