U.S. womens soccer2012 Earlier, we examined data on the number of goals scored by the U.S. womens soccer team in games played in the 12 months prior to the 2012 Olympics. The dotplot below displays the goal differential for those same games, computed as U.S. score minus opponents score. (a) Explain what the dot above 1 represents. (b) What does the graph tell us about how well the team did in 2012? Be specific.

Statistics for Psychology Concept 2 * z-test * single sample t test * used to compare a sample mean to a population with known mean, but the variance of the population is unknown * dependent means t test * also known as a “repeated measures” or “within subjects” research design because it compares two scores for each individual in the sample * Looks for a before and after effect * frequently seen in determining efficacy of a particular therapy or medication on a group of individuals * “before” scores as a baseline prior to a treatment * “after” scores gathered following a treatment or intervention (a dependent variable manipulation) * after minus before * unknown population mean and variance * two scores for each