Answer Happy

On its municipal website, the city of Tulsa states that the rate it charges per 5 CCF of residential water is $21.62. How do the residential water rates of other U.S. public utilities compare to Tulsa's rate? The data shown below ($) contains the rate per 5 CCF of residential water for 42 randomly selected U.S. cities. 10.58 9.28 11.9 6.6 12.52 10.22 14.6 16.28 17.7 19.28 18.08 12.95 #A 14.63 15.66 16.9 17.45 15.74 14.9 19.01 18.09 15 18.52 16.15 26.95 22.42 22.86 21:08 23.55 19.15 23.8 19.30 23.85 27.9 27.15 27 24 27.09 24.78 37.96 26.61 39.11 29.56 41.75 (0) Formulate hypotheses that can be used to determine whether the population mean rate per 5 CCF of residential water charged by U.S. public utilities differs from the $21.62 rate charged by Tulsa. (Enter 1 for as needed.) Mo 21.62 21.62✔ (b) What is the best statistic for your hypothesis test in part (a)? (Round your answer to three decimal places) What is the value for your hypothesis test in part (a)? (Round your answer to four decimal places) 2526 (At-0.05, can your null hypothesis be rejected? What is your conclusion? Reject H. The mean rate per S CCF of residential water throughout the United States differs significantly from the rate per S CCF of residential water in Tulsa o Os not reject H. The mean rate per 5 CCF of residential water throughout the United States does not differ significantly from the rate per 5 CCF of residential water in Tusa Do not reject H The mean rats per 5 CCF of residential water throughout the United States offers significantly from the rate per 5 CCF of residential water in Tulsa Reject M. The mean rate per S CCF of residential water throughout the United States does not differ significantly from the rate per S CCF of residential water in Tulsa
(d) Repeat the preceding hypothesis test using the critical value approach. State the null and alternative hypotheses. (Enter - for as needed.) Ho μ= 21.62 != 21.62 HA Find the value of the test statistic. (Round your answer to three decimal places.) -1.15 X State the critical values for the rejection rule. Use a 0.05. (Round your answers to three decimal places. If the test is one-tailed, enter NONE for the unused tail.) test statistics test statistic Z State your conclusion. Reject Hy The mean rate per 5 CCF of residential water throughout the United States differs significantly from the rate per 5 CCF of residential water in Tulsa. Do not reject Ho. The mean rate per 5 CCF of residential water throughout the United States does not differ significantly from the rate per 5 CCF of residential water in Tulsa Do not reject Ho. The mean rate per 5 CCF of residential water throughout the United States differs significantly from the rate per 5 CCF of residential water in Tulsa. Reject H. The mean rate per 5 CCF of residential water throughout the United States does not differ significantly from the rate per 5 CCF of residential water in Tulsa