
1  Descriptive statistics are tools that help researchers draw
conclusions about the probable populations from which
samples did or did not belong.






















2  The mean is the middle score in a distribution. 





















3  The variance is the difference between the highest and lowest scores. 





















4  In essence, the standard deviation is a measure that shows how far scores deviate from the mean on the average. 





















5  Skewness refers to the location of the "hump" of data in a distribution. 





















6  Look at these two symbols
The first symbol represents the variance of the sample whereas the second symbol represents the variance of the population. 





















7  The standard normal curve is a data distribution that tells the expected value that would be obtained by sampling at random. 





















8  A correlation indicates the presence of a causal relationship. 





















9  Z scores transform actual sample data into units of a distribution with a mean of 0 and a standard deviation of 1. 





















10  A correlation coefficient with a negative sign in front of it indicates a lower correlation than one with a positive sign. 





















11  A Pearson product moment correlation is used when each variable is on the ordinal scale. 




















