The null hypothesis for our study is that the total cholesterol in our population of "nonexercisers" is mu= 210 mg/dL. Our 95% confidence interval included 210 ng/dL. Our pvalue was not statistically significant at the alpha=0.05 level. Our sample average was xbar = 205 mg/dL.

a. We can conclude the true population mean cholesterol among "nonexercisers" is 210 mg/dL.

b. We can conclude the true population mean among "nonexercisers" is 205 mg/dL.

c. We can fail to reject that true population mean among "nonexercisers" is 210 mg/dL.

d. We can accept the true population mean among "nonexercisers" is 210 mg/dL.