1 I am comparing the the number of steps taken by people of various ages in New York and Los Angeles. Below is some of the output. Interpret all main effects, interactions, and the t-test in layman's (grandparent) terms using the correct numbers. "Person age 10 years".

2 I am comparing the working memory of Americans and Europeans. What test should I use?

Tests of Between-Subjects Effects Dependent Variable: TotalVolume Source Type III Sum of Squares df Mean Square F Sig Corrected Model 55257087184852272.000 5 11051417436970500.000 15.169 0.000 Intercept 448076927996780000.000 448076927996780000.000 615.007 0.000 City 31252894565789100.000 31252894565789100.000 42.896 0.000 Age 9002870728720850.000 2 4501435364360420.000 6.178 0.007 City * Age 14725221970545500.000 2 7362610985272770.000 10.106 0.001 Error 16757158396009900.000 23 728572104174342.000 Total 541997450745402000.000 29 Corrected Total 72014245580862100.000 28 Group Statistics tTestCodes N Mean Std. Deviation Std. Error Mean Steps P10 New York 4 5000.0000 1000.00000 500.00000 P10 Los Angeles 4 6500.0000 1000.00000 500.00000 Independent Samples Test Levene's Test for Equality of Variances t-test f F Sig df Sig. (2-tailed) Steps Equal variances assumed 0.255 0.632 3.033 6 0.023 Equal variances not 3.033 5.332 0.527 assumed