The arm of the robot moves so that r = 3 ft is constant, and its grip A moves along the path z = (3 sin 4u) ft, where u is in radians. If u = (0.5t) rad, where t is in seconds, determine the magnitudes of the grips velocity and acceleration when t = 3 s.

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