ΤΥΡΕ OF DEMOCRAT REPUBLICAN INDEPENDENT TOTAL EMPLOYEE EXECUTIVE (E) PRODUCTION WORKER (PVW) 34 48 63 21 8 92 ТОTAL 68 55 17 140 ANSWERS THESE QUESTIONS AS FRACTIONS. YOU DO NOT NEED TO REDUCE. One person is selected at random from the grouping.

What kind of variable is x in terms of linear regression? *   a) Independent   b) Dependent   c) Both of the above   d) None of the above

Baby walkers are seats hanging from frames that allow babies to sit upright withtheir legs dangling and feet touching the floor. Walkers have wheels on their legsthat allow the infant to propel the walker around the house long before he or she canwalk or even crawl. Typically, babies use walkers between the ages of 4 months and11 months.Because more walkers have tray table in front that block babies’ view of their feet,child psychologists have begun to questions whether walkers affect infants’cognitive development. One study compared mental skills of a random a=sample fothose who used walkers with a random sample of those who never used walkers.Mental skill scores averaged 113 for 54 babies who used walkers (standard deviationof 12) and 123 for 55 babies who did not use walkers (standard deviation of 15). (A) Is there evidence that the mean mental skill score of babis who use walkers is different from the mean mental skill score of babies who do not use walkers? Explain your Answer.

are F2 and F3 conservative? also what about parts B and C?