A local change business claims that the mean waiting time for customers is 20 minutes or less. The quality assurance department found in a sample of 24 customers that the mean waiting time was. 22.75 minutes with a standard deviation of 8.25 minutes. At the 0.05 level of significance. Can we conclude that the claim is wrong? a) state the null and alternative hypotheses b) is this a one-tailed or two-tailed hypothesis text? c) find the critical value d) calculate the test statistic )what is your decision in regards to the null hypothesis