Definitions
The statistical term for an average
What is the mean?
The mean is the sum of all values divided by this number
What is the number of values in the sample (N)
This chart is used to display the frequency distribution
What is a histogram?
This branch of statistics uses a sample to derive conclusions about a sample
What is inferential?
This value is used to reject the null hypothesis
What is the critical value?
Typically +/- 1.96
The most frequent observation in a sample
This test is used to evaluate the difference of means between two independent samples
What is a t-test?
A value, when visualized, that is far away from most of the rest of the data
It states there is no difference in means between the two samples
What is the null hypothesis?
The number of standard deviations that capture 99% of the values
What is 3 (in a normal distribution)?
The middle observation in a sample
What is the median?
This value is the square root of the variance
What is the standard deviation?
This plot is often used in EDA to look for trends in the data
What is a scatter plot?
What is kurtosis?
This value is used to determine if the test results are significant
p (alpha), typically set at <.05 = significant
This branch of statistics organizes and summarizes data
What is descriptive?
The likelihood that the true population parameter lies outside the confidence interval
p<.05
The middle value on a box and whiskers plot
A measure of the symmetry of a distribution
What is skewness?
You can be 95% certain that the mean falls within this range of values
What is a 95% confidence interval
(or 99% confidence interval)
A measure of how spread out the data is
What is standard deviation?
(variance is also acceptable)
The critical value at a 95% confidence interval
What is +/- 1.96?
The value for a kurtosis curve to be considered normal
What is (-2,2)?
What is Central Limit Theorem?
The value used in a t-test to accept the null hypothesis
What is none? (The t-test is used to reject or not reject the null)