Spice Lab Results Analysis Flashcards
Continuous Data
can be measured on a continuum or scale, with numeric values that can be meaningfully subdivided into finer and finer increments, depending upon the precision of the measurement system.
p vales for R^2 value
thresholds for statistical significance of R^2 values
Generally less than 0.5 to be considered significant
R^2 value
generally for scatter plots
tells us how much of the variation in your dependent variable is explained by your independent variable.
Type of data bar charts are good for
categorical
Standard deviation
the spread of individual data points around the mean
represented by error bars on the bar graph
t statistic
value in the t test formula:
tells you whether the means for data populations are significantly different from one another
Bonferroni corrected p-value (definition)
when you set the p-value for your t test lower than 0.05 because you’ve used multiple t tests to compare more than two sets of data
THE NEW/CORRECTED P-VALUE YOU USE INSTEAD OF 0.05 (bc you used more than one t test)!!!
Best fit/trend line
A straight line drawn through the center of a group of data points plotted on a scatter plot.
If the slope of this line has a R^2 close to 1, the x axis variable and y axis variable are considered to have a close correlation
Bonferroni Corrected P-value (formula)
0.05/number of t-tests performed
3 variables in the t statistic value
- how different the means in question are
- how much the individual data points vary in each group
- how big the sample size is
t test
T-tests are used to compare two means while integrating information about sample sizes and spread of the data about the mean of each group
Mean
same as average
the sum of all numbers in a group divided by the total number of samples
Type of data scatterplots are good for
continuous
Categorical Data
Categorical variables represent types of data which may be divided into groups.
exp. of categorical variables are race, sex, age group, and educational level.
