A group of sports scientists were interested in studying children's running ability and used the aforementioned pipe test.

Answears can be: Chi-square test, bivariate regression analysis, paired t-test, ANOVA, linear regression analysis, unpaired t-test

Mark which statistical tests you should use to answer the following research questions:

a) Was the pipe-test performance of children in the capital area better / or worse than the performance of children in rural areas?

b) Children in Hsavk were asked to take the test twice a week to see if they did better on the test with or without music.

c) Iceland was divided into four districts (south, west, north and east). Was there a difference in the children's performance by district?

d) Not all children wanted to take part in the pipe test. What was the ratio for girls or boys?