For all hypothesis tests: verify the requirements are met, state your null and alternative hypotheses, compute the test statistic, use either the classical or P-value approach, and state your conclusion. r i 4. In 1990 the average monthly bill for a cellphone in the U.S. was $81. My uncle Vernon argues that the average phone bill these days hasn't changed since the 90's; my cousin Dudley disagrees. Suppose that a random sample of 45 Americans today results in a mean cellphone bill of $114 with a standard deviation of $5. Test this hypothesis at the a = 0. 10 level of significant\