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Science Extension: Significance tests Flashcards | StudBud
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Science Extension: Significance tests
Science Extension: Significance tests
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1
T tests allow us to do what?
Compare the data
Calculate the spread of data
Compare the probability
determine if there is a significanct difference in means
2
A chi squared test....
Is a parametric test for difference
Is only used if there is a two tailed hypothsis
Works for unrelated data
Allows us to look for differences in nominal data
3
Chi squared test. Hypotheses are:
H0 no correlation between... H1 some correlation between...
I'd need to know whether it's one-tailed or two-tailed.
H0 no association between... H1 some association between...
H0: they are independent H1: they are not independent
4
If the probability value is < 0.05 which hypothesis do you accept?
Alternate hypothesis
Null hypothesis
Small hypothesis
Big hypothesis
5
The Chi Squared test assumes ____________.
Both red and blue
the level of measurement is nominal
independent random samples
the data is normally distributed
6
How would you justify using the t-test? "Because the experiment...
... involves data that are categorical
... involves comparing the values of two sets of data"
... involves comparing the mean values of two sets of data"
... involves an association between two sets of data"
7
What type of significance test should be used below?
chi-squared test
correlation test
Anova test
t-test
8
What type of significance test would be used below?
t test
correlation
chi-squared
Anova
9
For a 2-sample t-test, which of the following
must
be true?
Both groups' sample sizes > 40
Data are paired by subject
Populations were normally distributed
Groups are independent from each other
10
What significance level do we use for a t-test in biology?
10%
0.5%
5%
1%
11
A chi-squared test...
shows the dependence between two data sets
tests the relationship between two data sets
involves a comparison between observed and expected values
tests general statistics about a data set
12
What test determines whether values in each group have a similar variance?
t-test
Mann whitney test
F test
Shapiro Wilkes test
13
Chi squared test is testing
frequencies of different categories
differences in Mean
allelic frequencies
Correlation
14
What allows you to work out whether the data is normally distributed?
Pearson's correlation
Pearson's soap
Pearson's coefficient of determination
Shapiro Wilkes test
15
What test is used to work out if temperature affects enzyme activity
Regression
ch-squared test
correlation
t-test
16
Chi squared test. Hypotheses are:
I'd need to know whether it's one-tailed or two-tailed.
H0 no association between... H1 some association between...
H0 no correlation between... H1 some correlation between...
H0: they are independent H1: they are not independent
17
If the probability value is < 0.01 which hypothesis do you accept?
Small hypothesis
Big hypothesis
Alternate hypothesis
Null hypothesis
18
Which of the following is not a T-Test?
Paired T-Test
One Sample T-Test
Independent T-Test
Mr T-Test
19
What type of significance test would be used below?
correlation
Anova
regression
chi-squared
20
A hypothesis should be stated before any statistical comparison and include
One and two hypotheses
Null and alternate hypotheses
Great and full hypotheses
Bad and good hypotheses
21
In a normal distribution what values are all the same?
Standard deviation, mean, range
Minimum, mode, mean
Median, mode, maximum
Mean, mode, median
22
What type of t-test is used to determine statistical significance below?
unpaired (independent) two-tailed t test
paired (dependent) two-tailed t -test
23
T-test or chi-squared test for statistical significance?
t-test
chi-squared test
24
What significance test is used for the following?
chi-squared test
t test
25
What type of significance test would be used below?
t test
regression
chi-squared
Anova
26
What is the key difference between a t-test and an ANOVA?
Number of groups for an independent variable
Number of dependent variables
The use of ratio data
The use of a continuous dependent variable
27
Which hypothesis can be tested using the t-test?
The dfrnce. in variation between samples is not significant
The difference between the means in two samples is not significant.
The change in one var. is not correlated w/ another's change
Difference between observed and expected values is not significant
28
Given the t-test statistic is 0.558 and p-value is 0.291
Reject the null
Do not reject the null
29
What test is used to compare more than two means?
Anova test
Mann-Whitney test
Pearson correlation test
chi-sqiared test
30
If the probability value is > 0.05 which hypothesis do you accept?
Alternate hypothesis
Null hypothesis
Big hypothesis
Small hypothesis
31
When would you use a t test?
When you want to calculate a 95% confidence interval
When you are running a hypothesis test with proportions
To determine the probability of a Type II error
When you are running a hypothesis test with means
32
A t-test measures:
Comparison of standard deviations of two data sets
Comparison between means of two data sets
Comparison of medians between 2 data sets
Comparison of more than 2 data sets
33
Does the data have to be normally distributed to undertake a t-test?
Yes
Never
No
Sometimes
34
What is the probability value generally set at for carrying out statistical tests?
p<0.05
p>0.005
p<0.005
p>0.05
35
Average temperatures for Sydney and Melbourne over 10 days. Significance test?
t-test
regression test
Chi squared test
Anova test
