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Biostats review Flashcards | StudBud
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Biostats review
Biostats review
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Answers
1
What does our cutoff of 0.05 for a p-value represent?
Beta
The probability of that difference (or relationship) if the null were true
The probability that our data are accurate
Alpha
2
Why are statistics useful?
Increase noise in data
Increase the effect of cherry picking
Reduce bias in interpretation of experiments
Increase extrapolation
3
What do you need to know to do a binomial problem?
The variance
The probability of a past occurrence
The mean occurrence
The number of trials
4
When making a fequency distribution, you should:
You should divide the range by 2, then round
You should use one bin for each value in the range
You should divide the range by 10, then round
Change the number of bins depending upon how big the range is
5
What type of test would we use?
Randomized block ANOVA
Two-way ANOVA
Paired t-test
Repeated measures ANOVA
6
What is the first thing that you should do for this problem?
Calculate the average of the counts
Type in poisson.dist using the Counts of quadrats
Sum the counts of the quadrats
Multiply the Plants/quadrat by Count of quadrats
7
If you wanted to investigate whether staying physcially active reduced dementia, you might use:
A case-control study
A cohort study
A cross-sectional survey
A randomized control trial
8
What type of test would you use for this problem?
Repeated measures ANOVA
Paired t test
Correlation
Chi-square test
9
When do you use a pie chart?
Pretty much never
When you have categorial data
When you want to show change over time
When you want to show a relationship between two variables
10
If the question asks for a probability and describes a rare situation with a mean occurrence, you would use:
The binomial distribution
The normal distribution
Classical probability
The Poisson distribution
11
What type of test would you use?
ANOVA
Chi-square goodness of fit
Regression
One sample t-test
12
What type of test would you use?
Regression
Correlation
Single factor ANOVA
Two sample t-test
13
Egg, larva, juvenile, adult would be an example of a ________________ variable.
Nominal
Derived
Continuous
Ordinal
14
If you have no information other than the number of times something happens and how often it could happen, you would use
The binomial distribution
Classical probability
The normal distribution
The Poisson distribution
15
What type of distribution isn the center figure?
Unimodal
Skewed left
Skewed right
Bimodal
16
What happens when we make a type II error?
We did our measurements wrong
We accept the alternative hypothesis when we got no difference/relationship
We accept the null when there was a difference/relationship
We accept the null when there was no difference/relationship
17
What is k in this problem?
0
100
3
5
18
If you want to compare the variability of two variables that have really different magnitudes, you should use:
Variance
Standard error
Coefficient of variation
Standard deviation
19
What is the first thing that you should do for this problem?
Subtract 2.25 from 7
Draw the distribution
Subtract 5.5 from 8.5
Calculate the standard deviation
20
The mean, median, and mode would be equal for this distribution.
False
True
