In the United States, the average age of menarche (firstmenstrual period) is 12.75 years. Now, let's suppose that residentswho live near an abandoned chemical plant are concerned about theenvironmental effects on their children. Suppose that one concernedparent gathered the data on age of menarche for 25 residents whohad lived in the area for at least six years before puberty.Summary data (in years) follow. Show all work

x=11.20

s(hat)=2.297

(u=12.75, N=25)

Construct a 95 percent confidence intervalabout the mean.

Explain what the data have to say about the resident's concern.In your explanation, refer to your confidence interval and thenation's average age of menarche.