final exam help

1 (6 pts). State the null and alternative hypothesis. State the direction: Right tail, Left tail, Two tails. a) Based on past sales, a shoe manufacturer considers the average women shoe size to be 7.5. To test is this is still the case, set up a hypothesis needed to perform a hypothesis test with a level of significance of a = 0.01. b) The ocean is believed to have an average fluoride concentration of 1.3 ppm. A marine biologist is concerned that the level of fluoride is too high in a particular area and is killing ocean life. Set up the hypothesis needed to perform a hypothesis test with a 95% level of confidence. lowing