Test 2 Review

Correlations are what require what type of data?

• Quantitative

• Bivariate

• Categorical

• Predictive

the regression coefficient a is

• the slope

• the predictor variable

• the outcome variable

• where the regression line crosses the y axis

an empirical distribution

• is based on observations

• is normal

• is based on math and logic

• is found in Table C in the back of the book

A normal distribution:

• is asymptotic

• has 2 inflection points

• has the same mean, median, and mode

• all of the above

a random sample is one that

• in which every sample of a particular size has an equal probability of being selected

• is biased

• has certain groups from the population over-represented or under-represented

• is based on math and logic

The standard deviation of a sampling distribution is called the

• Standard value

• Expected value

• Expected error

• Standard error

The central limit theory states that the sampling distribution of the mean approaches the normal curve

• if the data is normal

• if the expected value is 0

• if the sample size is large

• if there is a large confidence interval

the t distribution is used when

• we don't have population information

• we have a biased sample

• the data is non-normal

• we are conducting a t-test