Online dating services have increased in popularity over the past several years. Researchers are interested in the breakdown of the population of users. In a random sample of 25 online dating service users, the mean age was 48 with standard deviation of 15 years. Find a 95% confidence interval for the true mean age of online dating service users.

Select one:

a.

( 19.188, 30.812)

b.

( 42.867, 53.133 )

c.

( 36.609, 56.391)

d.

( 41.808, 54.192)