Recitation 1

Some Simple Data Summaries

Here are some psychological test scores for 20 boys and 20 girls.

Boys	91	64	98	66	83	87	83	86	80	93
	83	75	72	79	90	80	90	71	84	68
Girls	75	89	85	84	84	87	91	71	72	98
	81	80	92	90	84	88	87	83	77	75

Some questions to answer in this recitation:

1.

Make a stemplot of the boys' test scores.

2.

Find the median and the lower and upper quartiles of the boys' scores.

3.

Make a back to back stemplot of the two groups.

4.

Make boxplots of the two groups.

5.

What differences do you notice?