Compute t-tests and find the critical value using a two-tailed test and an - level of .05. State your conclusions.

a. The standard for a good overall cholesterol level is 200 mg/dL or lower. You have data from a group of 31 women athletes. Their overall cholesterol is 178 mg/dL with a standard deviation of 18.2 mg/dL. Is their cholesterol significantly different from this at p ≤ .05? 

b. The average child should consume about 2200 calories a day. You have data from a group of 19 children who all watch more than 2 hours of television a day. On average, they consume 2650 calories a day, with a standard deviation of (122). Is their caloric intake significantly different from that of other children at p ≤ .01? 

c. The target aerobic heart rate for people age 20 years is 120 bpm. You have data from a group of 16 male golfers (all age 20 years). Their average heart rate after golfing for 30 minutes is 110 bpm, with a standard deviation of 15.8 bpm. Is their golfing providing them with enough aerobic exercise? Use an -level of .01.