A prospective study of carbohydrate metabolism was done with 56 normal women who were 4 to 11 weeks postpartum.

a.The investigators reported, "The characteristics of the women were similar to those seen in most postpartum family-planning populations. Their mean parity was 3.40.3. " By your judgement, is the value of 0.3 in "mean parity was 3.40.3" a standard deviation (SD) or a standard error of the mean (SEM)?

b.Further they reported, "Their mean control weight was 163.5 pounds with a sample standard deviation of 4.6 pounds." Construct a 95% confidence interval for the mean. [Assume the 56 weights are normally distributed and the population standard deviation is known to equal to 5 pounds.

Please assist with this problem and show step by step on how you obtained your answer. Thank you