Statistics BI

used to determine whether the differences between the means of two populations are statistically significant.

The starting point in scientific research is where the investigator assumes there is no effect of the treatment or no relationship between two variables.

Known as the research hypothesis, it is what the investigator believes to be true. The means are typically set as an inequality, meaning that they are not equal.

Prediction that the mean (u) of group one (u1) will be more than or less than the mean of group 2 (u2).

Prediction that the mean of group one is not equal to the mean of group two.

The measure of the spread of the data about the mean. The more spread out the data points are the larger the variance

The measure of the spread of the data about the mean, and it is the square root of the variance.

A measure of certainty that the sample populations are representative of the population being studied.

What are the two main type of two sample t-test?