PSYC 315 Chapter Notes - Chapter 10: Confidence Interval, Test Statistic

• School: Concordia University
• Department: Psychology
• Course: PSYC 315
• Professor: Alan Boyle

Document Summary

Used to compare two means in a between-groups design (e. g. , each ps is in only one condition). The distribution of differences between means (part 1) Independent sample t-test are a distribution of differences between means rather than a distribution of mean difference scores in a paired t-test (e. g. , mean difference of pre and post score for each ps). Each point on the graph is a difference between means. The sd is how variable the differences between means are. Equation: (cid:1872)=(cid:1867)(cid:1854)(cid:1871)(cid:1857)(cid:1870)(cid:1874)(cid:1857) (cid:1856)(cid:1858)(cid:1858). (cid:1854)(cid:1857)(cid:1872)(cid:1875)(cid:1857)(cid:1857)(cid:1866) (cid:1865)(cid:1857)(cid:1853)(cid:1866)(cid:1871) (cid:1857)(cid:1876)(cid:1868)(cid:1857)(cid:1855)(cid:1872)(cid:1857)(cid:1856) (cid:1856)(cid:1858)(cid:1858)(cid:1857)(cid:1870)(cid:1857)(cid:1866)(cid:1855)(cid:1857) (cid:1854)(cid:1857)(cid:1872)(cid:1875)(cid:1857)(cid:1857)(cid:1866) (cid:1865)(cid:1857)(cid:1853)(cid:1866)(cid:1871) (cid:4666)(cid:1873)(cid:1866)(cid:1856)(cid:1857)(cid:1870) (cid:1866)(cid:1873)(cid:1864)(cid:1864)(cid:4667) (cid:1857)(cid:1871)(cid:1872)(cid:1865)(cid:1853)(cid:1872)(cid:1857) (cid:1867)(cid:1858) (cid:1871)(cid:1872)(cid:1853)(cid:1866)(cid:1856)(cid:1853)(cid:1870)(cid:1856) (cid:1857)(cid:1870)(cid:1870)(cid:1867)(cid:1870) (cid:1867)(cid:1858) (cid:1872) (cid:1857) (cid:1856)(cid:1858)(cid:1858)(cid:1857)(cid:1870)(cid:1857)(cid:1866)(cid:1855)(cid:1857)(cid:1871) (cid:1854)(cid:1857)(cid:1872)(cid:1875)(cid:1857)(cid:1857)(cid:1866) (cid:1872) (cid:1857) (cid:1871)(cid:1853)(cid:1865)(cid:1868)(cid:1864)(cid:1857) (cid:1865)(cid:1857)(cid:1853)(cid:1866)(cid:1871) (cid:1872)=(cid:4666)(cid:1839)(cid:2869) (cid:1839)(cid:2870)(cid:4667) (cid:882) (cid:1857)(cid:1871)(cid:1872)(cid:1865)(cid:1853)(cid:1872) (cid:1867)(cid:1858) If the null is true (they are drawn from the same population), - =0 (so just drop). The estimate of se is how variable the differences between two groups are. The distribution of differences between means (part 2) If h0 is true (failed to be rejected):