Suppose I am testing a new tennis ball launcher and have made some improvements. Before I began tinkering with it, the variance of the distance that the balls were launched was 35 feet2, and I am interested in testing if I have managed to reduce the variance. I launch 45 balls and calculate the sample variance to be 32.4 feet2. What would be the test statistic of this hypothesis test

Unaware that 35% of the 10000 voters in his constituency support him, a politician decides to estimate his political strength. a sample of 200 voters shows that 40% support him. a. what is the population? b. what is the parameter of interest? state its value c. what is the statistics of the interest? state its value d. compare your answers in (b) and (c) is it surprising they are different? if the politician were to sample another 200 voters, which of the two numbers would most likely change? explain