A Brief Quiz on chapter 12
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Descriptive statistics are tools that help researchers draw
conclusions about the probable populations from which
samples did or did not belong.
The mean is the middle score in a distribution.
The variance is the difference between the highest and lowest scores.
In essence, the standard deviation is a measure that shows how far scores deviate from the mean on the average.
Skewness refers to the location of the "hump" of data in a distribution.
Look at these two symbols
The first symbol represents the variance of the sample whereas the second symbol represents the variance of the population.
The standard normal curve is a data distribution that tells the expected value that would be obtained by sampling at random.
A correlation indicates the presence of a causal relationship.
Z scores transform actual sample data into units of a distribution with a mean of 0 and a standard deviation of 1.
A correlation coefficient with a negative sign in front of it indicates a lower correlation than one with a positive sign.
A Pearson product moment correlation is used when each variable is on the ordinal scale.