BIL 151 Midterm study guide
For each lab, know what the purpose of the lab was and what you did for the lab.
Be able to answer all the quiz questions.
They are posted on blackboard in the
documents section.
Lab 1:
Steps of the scientific method
1. Observes some natural phenomenon that brings to mind a problem/question
2. Formulates an hypothesis about that problem
3. Predicts whether data to be collected (via controlled experiments or field
observations) will reliably indicate whether the null hypothesis is true or false.
4. Designs and executes experiments
5. Analyzes experimental data
6. Rejects (or fails to reject) the null hypothesis, according to data analysis
7. Draws a conclusion about the original question
Null vs. Alternative hypothesis
The alternate hypothesis is the hypothesis that the researcher expects will be
proven, the hypothesis of interest
The null hypothesis is the opposite of the alternate
1tailed vs. 2tailed alternative hypothesis (what is the difference?
What would
each of
these
look like?)
1tailed=determine the direction in which observed results deviate from the
expected. Harder to reject
Ex. Using FatBGone will increase the amount of weight lost
2tailed= does not predict a direction, aka up or down
Ex. There will be a difference in between people using or not using “
”
Ttest.
What is it, why do you use it, in what situation would it be appropriate
to use
it?
I will not ask you to calculate a t value or p value, but
know the
difference
between them, how you get a p value from a t value (given the
proper table) and how
to interpret the results of a Ttest.
Ttest is a statistical test used to determine if there is a significant difference
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 Spring '08
 Winters
 Psychology, Statistics, Null hypothesis, Statistical hypothesis testing, researcher, representative

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