STAT 1000Q Lecture Notes - Lecture 18: Scania N112
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19 Oct 2017
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Statistic notes 1000q- lecture #18-t-tests and z-tests for pop proportions. For t-tests, we need to find a sigma to use since it is unknown. To compute p-value: use area under t-distribution graph. For a right tailed test, the p-value is the area to the right of t. For a left tiles t-est, the p-value is the area to the left. For two tailed test, double the right-tailed formula. Due to symmetry, p-value= 2 x tcdf(t, 10^99, n-1) The volatility of a stock is the beta coefficient (x) X=1: stock has risk compared to the market. X>1: stock has more risk than market as a whole. X<1: stock has less risk than the market as a whole. N=10, mean beta coefficient= x bar= 1. 23. Assume normal with rejection level of 0. 10. T= (1. 23-(cid:1005)(cid:895) / (cid:1004). (cid:1007)(cid:1011) x (cid:1005)(cid:1004) = (cid:1005). (cid:1013)(cid:1010)(cid:1010)
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