Question

video of brine shrimp
environmental change: decrease ph (add acid)
quantitative data: number of living shrimp
control group (count # alive in 4 boxes then find average)
day | 1 | 2 | 3
--- | --- | --- | ---

16	19	23
12	15	19
14	17	19
15	18	22
avg	avg	avg

x150
experimental group (count # alive in 4 boxes then find average)

14	4	0
17	2	1
13	3	5
15	3	2
avg	avg	avg

x150
environmental change: add pollutant (nitrogen from fertilizer)
quantitative data: number of living shrimp
control group (count # alive in 4 boxes then find average)
day | 1 | 2 | 3
--- | --- | --- | ---

16	19	23
12	15	19
14	17	19
15	18	22
avg	avg	avg

x150
experimental group (count # alive in 4 boxes then find average)

14	12	8
17	9	11
13	8	3
15	6	4
avg	avg	avg

x150

Explanation:

Step1: Calculate Control Group Averages (Decrease pH)

Day1:

$\frac{16 + 12 + 14 + 15}{4} = \frac{57}{4} = 14.25$

Day2:

$\frac{19 + 15 + 17 + 18}{4} = \frac{69}{4} = 17.25$

Day3:

$\frac{23 + 19 + 19 + 22}{4} = \frac{83}{4} = 20.75$

Step2: Calculate Experimental Group Averages (Decrease pH)

Day1:

$\frac{14 + 17 + 13 + 15}{4} = \frac{59}{4} = 14.75$

Day2:

$\frac{4 + 2 + 3 + 3}{4} = \frac{12}{4} = 3$

Day3:

$\frac{0 + 1 + 5 + 2}{4} = \frac{8}{4} = 2$

Step3: Calculate Control Group Averages (Add Pollutant)

Day1:

$\frac{16 + 12 + 14 + 15}{4} = \frac{57}{4} = 14.25$

Day2:

$\frac{19 + 15 + 17 + 18}{4} = \frac{69}{4} = 17.25$

Day3:

$\frac{23 + 19 + 19 + 22}{4} = \frac{83}{4} = 20.75$

Step4: Calculate Experimental Group Averages (Add Pollutant)

Day1:

$\frac{14 + 17 + 13 + 15}{4} = \frac{59}{4} = 14.75$

Day2:

$\frac{12 + 9 + 8 + 6}{4} = \frac{35}{4} = 8.75$

Day3:

$\frac{8 + 11 + 3 + 4}{4} = \frac{26}{4} = 6.5$

Step5: Calculate X150 Values (Multiply Avg by 150)

Decrease pH Control:

Day1: $14.25 \times 150 = 2137.5$; Day2: $17.25 \times 150 = 2587.5$; Day3: $20.75 \times 150 = 3112.5$

Decrease pH Experimental:

Day1: $14.75 \times 150 = 2212.5$; Day2: $3 \times 150 = 450$; Day3: $2 \times 150 = 300$

Add Pollutant Control:

Day1: $14.25 \times 150 = 2137.5$; Day2: $17.25 \times 150 = 2587.5$; Day3: $20.75 \times 150 = 3112.5$

Add Pollutant Experimental:

Day1: $14.75 \times 150 = 2212.5$; Day2: $8.75 \times 150 = 1312.5$; Day3: $6.5 \times 150 = 975$

Answer:

Environmental Change: Decrease pH (add Acid)

DAY	Control Group (count # alive)	AVG	X150	Experimental Group (count # alive)	AVG	X150
2	19, 15, 17, 18	17.25	2587.5	4, 2, 3, 3	3	450
3	23, 19, 19, 22	20.75	3112.5	0, 1, 5, 2	2	300

Environmental Change: Add Pollutant (Nitrogen from Fertilizer)

DAY	Control Group (count # alive)	AVG	X150	Experimental Group (count # alive)	AVG	X150
2	19, 15, 17, 18	17.25	2587.5	12, 9, 8, 6	8.75	1312.5
3	23, 19, 19, 22	20.75	3112.5	8, 11, 3, 4	6.5	975