Kelly is a waitress and her average tip rate is 18%. After taking a sample of her tips from a week, she thinks her tip rate is actually higher. The data below is the tip rate for 15 randomly chosen checks (the numbers represent percentage). Assume that tip rates are normally distributed.

18.5	22	17	18.2	15
20	18	21.3	17.9	19.6
17.9	18.1	17.5	20	18

a) Express the null and alternative hypotheses in symbolic form for this claim. H0:H0: Ha:Ha: b) What is the test statistic. Round to 2 decimals. Dont forget to indicate if it is z= or t=. c) What is the p-value. Round to 4 decimals pvalue=