A rod of some material 0.50 m long elongates 0.40 mm on heating from 50C to 151C. What is the value of the linear coefficient of thermal expansion for this material? (A) 5.30 106 (C)1 (B) 7.92 106 (C)1 (C) 1.60 105 (C)1 (D) 1.24 106 (C)1 19.3

3.3 INFERENCE FOR POPULATION VARIANCE 1) We can calculate the estimated population variancewith 2) also note that this is true: 2 *where X is representative of the chi square distribution with n-1 degrees of freedom 3.3.1 CONFIDENCE INTERVAL 3.3.2 HYPOTHESIS TEST 2 1) To test something dealing with σ we use test statistic: where the null hypothesis is still rejected when p-value