(From Windish. (2007). JAMA, 298(9), 1019.) You read in the journal article in Table 1 that average age in the study was xbar = 25 years and sample standard deviation was s=5 years. You are confident the study population is approximately normally distributed with respect to age.

Which of the following would you be most comfortable concluding?

a. Most of the participants were close to 25 years old, and the remainder were between 20 and 30 years old.

b. No participants were younger than age 15 or older than age 35 years.

c. Approximately 95% of the participants were aged between 15 and 35 years.

d. We can construct a 95% CI for the mean age as (25 +/- 5) years.