PSY 230 Lecture Notes - Lecture 7: Standard Deviation, Statistical Parameter, Pooled Variance
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Alternative hypothesis: the alternative hypothesis is that the toddlers receiving the leaps program will have higher iq scores than the control toddlers at the end of the preschool year, ha: iq mean leaps > iq mean control. Tanya randomly selects 2 head start centers in raleigh, nc: 1 site provides 7 toddlers assigned to an experimental leaps program, another site provides 7 toddles who are assigned to a control group measure. The wechsler preschool and primary scale of intelligence (wppsi-iii, 2002) is designed for children ages 2 yrs 6 months to 7 yrs 3 months. 14. number of values in the final calculation of a statistic that are free to vary. 15. number of independent pieces of information that go into the estimate of a parameter is called the degrees of freedom (df) 16. for example, with two independent groups in a t-test that are samples estimating the population parameter requires a degree of freedom for each group being estimated.
