Unit 1 Test

Question 1

Things that change in a experiment

Answer 1

Variables

Question 2

The actual thing that you are testing and changing across your experimental groups. On a graph, placed on the X-axis

Answer 2

Independent variables

Question 3

The response to your independent variable changing, meaning measured or observed. On a graph, placed on the Y-axis

Answer 3

Dependent variables

Question 4

Something that should be kept the same for the entire experiment, especially between different trials

Answer 4

The constant or controlled variable

Question 5

The group that does not contain your independent variable, or the absence of what you’re experimenting. This is the see your independent variable actually causes a difference compared to when it didn’t exist. (in a control experiment, you only ever have one independent variable)

Answer 5

Controls

Question 6

Designed where a known response is expected, for example, we expect bacteria to grow on nutrient agar

Answer 6

Positive control

Question 7

Is designed where no responses are expected. This shows that your experimental set up is working properly. For example, we expect the antibiotics to kill bacteria grown on nutrient agar that has been sublimated with antibiotics.

Answer 7

Negative controls

Question 8

That refers to the qualities of something (color, shape, texture, odor). An example would be the liquid turned orange after we added the iron.

Answer 8

Qualitative

Question 9

That refers to the quantity of some thing (amount or value). An example would be the mass increased 4 g.

Answer 9

Quantitative

Question 10

What are descriptive statistics?

Answer 10

Mean, median, standard error of the mean, and interquartile range (IQR)

Question 11

What are the graphing requirements? (TALKS)

Answer 11

Title
Axis measurements
Labels with units
Key
Scale

Question 12

What graph is used for comparing items?

Answer 12

Bar graphs

Question 13

What graph is used for continuous independent variables? (Often use for change of time)

Answer 13

Line graphs

Question 14

Hypothesis you write when saying independent variable does not have an effect on your dependent variable. Nothing is influencing your results.

Answer 14

Null hypothesis

Question 15

Hypothesis you write when you say something influence your results (your independent variable). You disapprove the null and accept the alternative.

Answer 15

Alternative hypothesis

Question 16

Represents the spread of your data from the mean/average.

Answer 16

Standard deviation

Question 17

Represents how accurately your sample mean represents a population mean. (Comparing your sample to that of the world). When you graph the SEM, you always graph the SEM multiplied by 2. This represents 95% confidence interval.

Answer 17

SEM, standard error mean

Question 18

Allows you to say either, we can reject the null hypothesis of no relation at the .05 level, or we have insufficient evidence to accept the at the .05 level.

Answer 18

Chi Square test

Question 19

Is usually numerical, such as temperature and time. This usually depicted in a line graph. think rates.

Answer 19

Continuous data

Question 20

Is categorical, and separate across different experimental groups. This is usually depicted in a bar graph.

Answer 20

Discrete data

Question 21

X^2 represents

Answer 21

Chi-squared