cards are here
$ What makes a question testable?
It must have testable (quantifiable) values. Height, weight, length, etc. It should always have an independent variable
$ What is an independent variable?
Something that I am going to change (manipulated)
$ What is a dependent variable?
Something that I am going to measure
$ What are constant variables?
Other variables that must be identified and controlled
Since the H0 and H1 hypothesises are contradictory, only one can be supported by data
$ What is a null hypothesis?
The difference that is seen between the two variables is by chance/there is no stairididal difference between the two variables (no relationship) There is no relationship between the amount of fertilizer and length of plants.
$ What is an alternate hypothesis
This shows that there is a relationship between the variables and there is a reason behind the difference. Prediction -> if, then, because If more fertilizer is added, then the height of the plant will increase, because fertilizer has more nutrients
Must support one of the hypothesises by the end of the experiment
If alternate hypothesis mispredicts the relationship, it is only partially supported
$ What is a control group?
A tested group not affected by the independent variable, used for comparison
$ What is a negative control group?
No change
$ What is an experimental/positive control group?
The group that uses the independent variable to test on.
$ What is quantitative data?
numeral results, measurable, can perform statistical analysis
$ What is qualitative data?
non-numerical results, results can be subjective, cannot statistically analyze.
Tables are a convenient way of recording data. Nevertheless they follow certain conventions
Title
| Fert (g) | Day 1 | Day 2 | Day 3 | |
|---|---|---|---|---|
| 0 | 20 | 21 | 22 | -> negative control group |
| 1 | 20 | 23 | 25 | -> positive control group |
| 2 | 20 | 21 | 22 |