ENS 95 –

Analysis of Variance

Prepared by

1. Following are data results of samples tested for shellfish toxicity

three sites in Davao Oriental:

Davao Gulf Mati Bay

3.33 4.52

2.41 1.7

5.67 5.88

� Test the hypothesis that there is a difference

shellfish toxicity levels

2. Samples of vegetables from t

Bukidnon were tested for pesticide residue levels (

the tests.

Valencia Maramag Don Carlos

3.4 4.5

5.5 3.6

2.3 4.9

4.8 4.1

3.3

� Test the hypotheses that there is a difference between the three wet

terms of pesticide residue levels in their vegetables sold at 0.05.

3. Three schools were sampled for the

Following are the results of the data gathered for 5 days in each school.

School 1 School 2

20.32 25.36

13.55 19.09

18.97 17.8

12.15 15.43

13.21 17.76

� Test the hypothesis that the schools

generated daily at 0.05.

– Environmental Research Methods

Analysis of Variance (ANOVA) Sample Problems

Prepared by: Michael Arieh P. Medina, Ph.D.

1. Following are data results of samples tested for shellfish toxicity level

Balite Bay

6.54

3.8

5.54

hypothesis that there is a difference between the three areas

at 99% confidence.

amples of vegetables from three wet markets in selected local government units of

Bukidnon were tested for pesticide residue levels (µg/mL), following are

Don Carlos

4.8

5.2

5.7

5.3

that there is a difference between the three wet

ticide residue levels in their vegetables sold at 0.05.

3. Three schools were sampled for the daily amount of solid waste generated

Following are the results of the data gathered for 5 days in each school.

School 3

10.18

14.35

11.21

16.3

14.56

Test the hypothesis that the schools differ in terms of the amount of daily waste

generated daily at 0.05.

level (µg/mL) from

between the three areas in terms of

ected local government units of

are the results of

that there is a difference between the three wet markets in

amount of solid waste generated (kgs.).

differ in terms of the amount of daily waste