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- Recently there have been concerns about the effects of phthalates on the devel- opment of the male reproductive system. Phthalates are common ingredients in many plastics. In a pilot study a researcher gave pregnant rats daily doses of 750 mg/kg of body weight of DEHP (di-2-ethylhexyl phthalate) throughout the period when their pups’ sexual organs were developing. The newly born male rat pups were sacrificed and their seminal vesicles were dissected and weighed. Below are the weights for the eight males (in mg). 1710 1630 1580 1670 1350 1650 1600 1650 If untreated newborn males have a mean of 1700 mg, can you say that rats exposed to DHEP in utero have a significantly lower weight?Explain the term "Autoregressions"? Define The First-Order Autoregressive Model?What is the critical value?