The following data represent the age in weeks at whichbabies first crawl based on a survey of 12 mothers conducted byEssential Baby. 52 30 44 35 39 26 47 37 56 26 39 28
a. Draw a normal probability plot (use Statcrunch) andboxplot to determine if it is reasonable to conclude the data comefrom a population that is normally distributed. Copy/paste thegraphs into your solution along with an explanation of why or whynot.
b. Construct a 90% confidence interval for the mean ageat which a baby first crawls.
c. Interpret your confidence interval in part “b”. (I am____% confident that ______).
d. Sample Size: How large a sample size is needed toestimate the mean age in weeks at which a baby first crawls within1.5 weeks with 95% confidence? (use formula on pg.413)
