In an experiment to compare the tensile strengths of i = 6 different types of copper wire, j = 5 samples of each type were used. the between-samples and within-samples estimates of σ2 were computed as mstr = 2637.3 and mse = 1095.2, respectively. use the f test at level 0.05 to test h0: μ1 = μ2 = . . = μ6 versus ha: at least two μi's are unequal. calculate the test statistic. (round your answer to two decimal places.) f =

An astronaut in space cannot use a scale or balance to weigh objects because there is no gravity. but she does have devices to measure distance and time accurately. she knows her own mass is 77.4 kg , but she is unsure of the mass of a large gas canister in the airless rocket. when this canister is approaching her at 3.50 m/s , she pushes against it, which slows it down to 1.30 m/s (but does not reverse it) and gives her a speed of 2.60 m/s . what is the mass of the canister?