Percentiles work similarly: they divide scores into 100 groups (or percentiles) so that each group contains exactly 1% of all scores (100/100). This means that if you get a score that places you in the 75th percentile for some test, 75% of other people who took that test had lower sco...
Explain the concept of error and uncertainty as it relates to decision making. Why are the answers different when you do percentile error method and standard error method? What is homogeneity of variance? The prediction error when x = 8 is ___. a. 4 b. 5 c. 6 d. 7. If alpha ...
Use the 68%-95%-99.7% (empirical rule) rule to answer the following: Assuming a set of test scores is normally distributed with a mean of 110 and a standard deviation of 12. What is the percentage of scores between 74 and 146? According...
When you have a skewed distribution, I find that reporting the median with the interquartile range is a particularly good combination. The interquartile range is equivalent to the region between the 75th and 25th percentile (75 – 25 = 50% of the data). You can also use other percentiles ...
Frequencies – Counts, percentages, valid and cumulative percentages; central tendency, dispersion, distribution and percentile values. Descriptives – Central tendency, dispersion, distribution and Z scores. Descriptive ratio statistics – Coefficient of dispersion, coefficient...
Frequencies – Counts, percentages, valid and cumulative percentages; central tendency, dispersion, distribution and percentile values. Descriptives – Central tendency, dispersion, distribution and Z scores. Descriptive ratio statistics – Coefficient of dispersion, coeffi...
True or False: If it is appropriate to present a distribution of scores in a polygon, then it would also be appropriate to present the scores in a bar graph. True or False: Mean value over an infinite number of observations of the A nominal scale is always dich...
Why are the answers different when you do percentile error method and standard error method? What is the difference between a point estimate for a parameter and an interval estimate for a parameter? What is the effect of n on the standard error of the mean? (a) What is the range?...
Frequencies – Counts, percentages, valid and cumulative percentages; central tendency, dispersion, distribution and percentile values. Descriptives – Central tendency, dispersion, distribution and Z scores. Descriptive ratio statistics – Coefficient of dispersion, coefficient...
Frequencies – Counts, percentages, valid and cumulative percentages; central tendency, dispersion, distribution and percentile values. Descriptives – Central tendency, dispersion, distribution and Z scores. Descriptive ratio statistics – Coefficient of dispersion, coeff...