The mean serum-creatinine level measured in 13 patients 24 hours after they received a newly proposed antibiotic was 1.1 mg/dL.   (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.)

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The mean serum-creatinine level measured in 13 patients 24 hours after they received a newly proposed antibiotic was 1.1 mg/dL.
 
(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.)
Expert Solution
Step 1

Given information

Sample mean = 1.1 mg/dL

Population mean µ = 1.0 mg/dL

Sample size = 13

Standard deviation σ = 0.4 mg/dL

Significance level (α) = 0.05

Since, population standard deviation is known therefore using z-test statistics.

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