use this Problem II. Revisit HW5 Problem 3A researcher wants to find out if the mean age (in weeks) at which babies first crawl is 39 weeks. Based ona survey of mothers conducted by Essential Baby, the following data was obtained. 51314336402547375527 3928Treat the sample as a simple random sample of all the ages (in weeks) at which babies first crawl and youmay assume that the distribution of first-time crawling age is approximately normally distributed. Use=0.04.a. State the statistical assumptions the data need to meet to ensure reliable results