Question

Questions for Further Thought and Review Extra Credit 1: Lab 1 Ecology students are required to do a lab research project, and two students decide to study the population growth of beetles in a sack of flour (food for the beetles). They collect the following data: Week boetes 80 225 275 950 10 12 2 2 1100 900 1. Identify the independent variable 2. Identify the dependent variable Is this data discrete or continuous? 3. Graph this data. Be sure to use a pencil and follow the graphing rules Der Bewe ngon 4. Identify the time interval during which each of the following occurred: the population grew (graph is rising) from week to week the population grew the fastest (graph is steepest) from week to week the population size remained the same (graph is horizontal) from week week to

Answer 1

1.- Time in weeks

2.- The number of beetles. Continuous data, because they are several measurements across a time interval

3.-

2 nhưng va ga Beetle count 1600- Bere 1400- 1200- 1000- 800 - 600 400 - 200 Time (weeks)

4.- The population grew from week 0 to week 10

The population grew the fastest from week 6 to week 8

The population remained the same from week 10 to week 12

The population decreased from week 12 to week 14

5.- For this just look at the point that in the line that crosses such time points

Week 5: 250

Week 9: 1025

6.- Yes it could, but it would be more difficult to track the continuity of this phenomenon, if we were to make a bar graph we would still need to draw a line at the top of the bars to correctly see the continuity.

7.- Beetle population declines after 12 weeks because they depleted the food source

8.- To test our hypothesis we should grow various different treatments variating the quantity of flour for them. If our hypothesis is correct we should see a correlation between the quantity of flour and the time bleetles take to start decreasing their population, if such correlation is not found then another factor is affecting the phenomenon.

Pulse rate experiment

In this case we should use a double bar graph, one bar for the normal rate and the other bar for the rate after physcical activity.