What patterns do you observe based on the information in Table 4?

INSTRUCTIONS TO CANDIDATES

ANSWER ALL QUESTIONS

EXERCISE 1: DATA INTERPRETATION

The pH scale is used to quantitatively assess how acidic or basic a solution is. The pH scale ranges from 0 – 10, with lower pH being more acidic and higher pH being more basic. A pH of 7 is considered neutral (neither acidic nor basic). The pH of the sur- rounding environment can have a great effect on what microbes are able to grow. Examine the data in Table 4, which shows the pH of culture media and the number of microbial colonies observed growing in each culture. Then, answer the questions below.

1. What patterns do you observe based on the information in Table 4?

2. Develop a hypothesis relating the pH level of the culture media to the number of microbial colonies observed in each cul- ture.

3. What would your experimental approach be to test this hypothesis?

4. What would be the independent and dependent variables?

5. What would be your control?

6. What type of graph would be appropriate for this data set? Why?

7. Graph the data from Table 4.

8. Interpret the data from the graph you made in Question 7.

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