Question

1. A study of 201 female Canadian athletes find that their average caloric intake was 2703.7 kilocalories per day (kcal/d). The recommended caloric intake is 2811.5 kcal/d. Assume that the standard deviation for caloric intake among all female Canadian athletes is 880 kcal/d. Is there evidence that female Canadian athletes are deficient in caloric intake?

1. State appropriate null and alternative hypotheses to test this.
2. Find the z test statistic.
3. What is the P-value?
4. Write a conclusion. Test at the α = 0.05 level.

2. Is the mean heart rate of children ages 9 – 11 less than 90 bpm (beats per minute)? Below is the heart rates of 25 children. Assume the population standard deviation is 14 bpm.   

82	93	79	89	82
84	91	80	89	68
98	87	72	74	104
112	112	57	80	91
97	87	94	72	60

Answer 1