Question 2 (Mandatory) (3 points) Suppose a student wishes to compute a 95% confidence interval of the mean $ amount biology students spend per semester on textbooks. Suppose it is known from past experience that the standard deviation for this $ amount is about $75.00. Help the student determine the minnimum sample size so the margin of error is within $ 15.00. O69 6 384 97 O 68 385 Question 3 (Mandatory) (6 points) In a sample, 31 out of the 68 females and 53 out of the 255 males reported traumatic child experiences. Construct a 90% confidence interval for the difference between the proportions of traumatic child experiences in the two sampled populations. (0.1403,0.3557) (0.1197,0.3763) (0.0794,0.4167) (0.2409,0.2551)