Brief review Flashcards
What is the mean?
The average of the data combined.
What is the median?
The middle-most point.
What is the mode?
The data that is repeated most often.
What is the standard deviation?
How dar most points fall above/below the mean.
What is the range?
The difference between the highest and lowest data point.
What is the mean deviation?
The average difference between most scores and the mean.
Interpret the confidence interval.
The mean will fall between this range but it does not determine if the sample mean is equal to the population mean.
Test statistic exceeds critical value.
Te test statistic (?) exceeds the critical value, reject the null hypothesis. Conclude that there is probably a real difference ay .05 significance.
Test statistic does not exceed critical value.
Te test statistic (?) does not exceed the critical value, retain the null hypothesis. Conclude that there no difference ay .05 significance.
Why related sample t-test?
Because we are testing the before and after of the same sample with the same sample size.
Why independent sample t-test?
Because we’re testing two independent samples.
Why two-tailed test?
Because we’re looking at both directions.
Why one-tailed test?
Because we’re looking at one direction.
Why do we use n-1 to calculate the standard deviation of a sample?
Because using N would underestimate the standard deviation.
We need to divide by a smaller number in order to get an answer that is more representative of a sample size.
Why do we use n-1 to calculate the standard deviation of a sample?
Because using N would underestimate the standard deviation.
We need to divide by a smaller number in order to get an answer that is more representative of a sample size.
