The mean serum-creatinine level measured in 13 patients 24 hours after they received a newly proposed antibiotic was 1.2 mg/dL. You can use SALT to answer parts of this question. (a) If the mean and standard deviation of serum creatinine in the general population are 1.0 and 0.4 mg/dL, respectively, then, using a significance level of 0.05, test whether the mean serum- creatinine level in this group is different from that of the general population. State the null and alternative hypotheses (in mg/dL). (Enter != for as needed.) Ho: H₁: Find the test statistic. (Round your answer to two decimal places.) Find the rejection region. (Round your answers to two decimal places. If the test is one-sided, enter NONE for the unused region.) test statistic > test statistic < State your conclusion. O Fail to reject Ho. There is insufficient evidence to conclude that the mean serum-creatinine level in this particular group of patients is different from that of the general population. O Reject Ho. There is insufficient evidence to conclude that the mean serum-creatinine level in this particular group of patients is different from that of the general population. O Reject Ho. There is sufficient evidence to conclude that the mean serum-creatinine level in this particular group of patients is different from that of the general population. O Fail to reject Ho. There is sufficient evidence to conclude that the mean serum-creatinine level in this particular group of patients is different from that of the general population. (b) What is the p-value for the test? (Use technology to find the p-value. Round your answer to four decimal places.) p-value = (c) Suppose the sample standard deviation of serum creatinine in part (a) is 0.7 mg/dL. Assume that the standard deviation of serum creatinine is not known, and perform the hypothesis test in part (a). Report a p-value. Find the test statistic. (Round your answer to two decimal places.) 0.72 x Use technology to report a p-value. (Round your answer to four decimal places.) p-value = 0.4847 x