1) Indicate whether each of the following studies is an experiment or an observational study. If it is an experiment, identify the independent variable and note any possible confounding variables.

(e) A school psychologist wishes to determine whether reading comprehension scores are related to the number of months of formal education, as reported on school transcripts, for a group of 12-year old migrant children.

2) Are there any conspicuous difference between the two distribution in the following table (one reflecting the ages of all residents of a small town and the other reflecting the ages of all U.S. residents)?

(c) Using just one graph, construct frequency polygons for the two relative frequency distributions.

This is the chart.

TWO AGE DISTRIBUTIONS AGE SMALL TOWN f U.S. POPULATION (2010) 65-above (%) 105 60-64 53 55-59 45 50-54 40 45-49 44 40-44 38 35-39 31 30-34 27 25-29 25 20-24 20 15-19 20 10-14 19 5-9 17 0-4 16 Total 500 99% NOTE: The top class (65-above) has no upper boundary. Although less oferred, as discussed previously, this type of open-ended class is then as in the Statistical Abstract