Answer:
95% confidence interval for the mean weight of newborn elephant calves is between a lower limit of 240.87 pounds and an upper limit of 247.13 pounds.
Step-by-step explanation:
Confidence Interval = mean + or - Error margin (E)
mean = 244 pounds
sd = 11 pounds
n = 50
degree of freedom = n - 1 = 50 - 1 = 49
Confidence level = 95%
t-value corresponding to 49 degrees of freedom and 95% confidence level is 2.010
E = t×sd/√n = 2.010×11/√50 = 3.13 pounds
Lower limit = mean - E = 244 - 3.13 = 240.87 pounds
Upper limit = mean + E = 244 + 3.13 = 247.13 pounds
95% confidence interval is between 240.87 and 247.13 pounds.
