1. Snow (independent variable) is on X axis, # Accidents (dependent variable) on Y axis.
2. Both X and Y axes are labeled, showing units (cm and #).
3. Spacing on both X and Y axes are uniform (evenly spaced).

Study #1 - Adaptations of Leaf Size and Precipitation

Example

Conclusion -
Leaf width increases with precipitation.

Study #2 - The Effect of Temperature on the Growth of Beans p. 20

Examples

Conclusion -
25 °C is optimal for bean growth. 30 °C is second best, but may be too warm if exposure is prolonged: the plant starts to stunt after 2 weeks.

Study #3 - Student Heights p. 21

Table 3a - Student Heights to the Nearest Whole cm

Use data from Measurement Lab.

Construct Table 3b and Graph 3; calculate mean.

Conclusion -
In most populations, the majority of individuals are clustered around the mean (average) height, few are short or tall, forming a bell-shaped curve.

1. Identify which quantity should be on the X-axis and which should be on the Y-axis for the examples that follow.
   1. Your child's weight is measured every year from birth to age 18.
      X - years; Y - weight
   2. You obtain the average price for each of five home styles.
      X - home style; Y - price
   3. You obtain information for the production of oxygen from a plant during photosynthesis under different light intensities.
      X - light intensities; Y - oxygen production

2. Use Graph 3 (height study) to answer the following:
   1. Which height groups appear most frequently in the class?
      see graph
   2. Which height groups appear most infrequently in the class?
      see graph
   3. What conclusion can be drawn about the heights of the people in the class?
      In most populations, the majority of individuals are about average height, only a few are short or tall.

3. State two advantages of organizing the data in tables.

   Tables can help sort the data into groups, and be used to prepare graphs.

4. State two advantages of expressing the data as a graph.

   Graphs show visual distribution of independent and dependent variables, and can be used to see trends or compare groups.