PSYC 354 Quiz: Variability Statistics for the social sciences (Liberty university)

Question 1 3 / 3 pts The symbol for sample variance is s. True False  Question 2 3 / 3 pts The value for SS can be less than zero. True False  Question 3 3 / 3 pts Why do deviation scores have to be squared before calculating the standard deviation? Squaring is necessary when calculating inferential statistics. If deviation scores are not squared, then the average distance from the mean will always equal 0. Squaring deviation scores allows for degrees of freedom to be calculated. If deviation scores are not squared, then the interquartile ranges are incalculable.  Question 4 3 / 3 pts For a population, a deviation score is computed as X – σ. True False  Question 5 3 / 3 pts For a population of scores, the sum of the deviation scores is equal to 0. True False  Question 6 3 / 3 pts In a sample with a mean of M = 4 made up of four scores, two scores are free to vary and the third and fourth scores are fixed. True False  Question 7 3 / 3 pts Which symbol below identifies the sample variance? s s2 σ σ2  Question 8 3 / 3 pts