For each of the hypothesis statements in problem 9.1, is a two-tailed test or one-tailed test needed? If it is a one-tailed test, indicate if it is a left tailed or right-tailed test.
Problem 9.1
(a) The mean length of a piece of ribbon increased to above 15 cm.
(b) The population proportion is the same as the historical value of 50%.
(c) The average height of a 32-year-old male in a community is claimed to be at most 180 cm.
(d) The proportion of healthy children in a community is believed to be less than 75%.
(e) The average weight of people in a community is 85 kg.
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