Statistics final wgu academy exam questions and answers

Statistics final wgu academy exam questions and answers Categorical variables that there is no natural order among the categories - Answer- nominal variables Categorical variables where there is natural order among the categories (low-high) - Answer- ordinal variable A measurement which makes sense to talk about the difference between values but not the ratio between values - Answer- interval Quantitive variables where is makes sense to talk about the difference in ratios. (Income, weight) - Answer- ratio Value 0 means the absence of quantity (income $0) - Answer- In ratios: Tells us what values the variables take and how often they take those values - Answer- Distribution of a Variable Vale 0 does not mean the absence of value (temp = 0F) - Answer- In intervals: Emphasize how the different categories relate to the whole - Answer- Pie charts Emphasize how the different categories compare with each other - Answer- Bar charts Breaking the range of values into intervals and count how many observations fall into interval. - Answer- Histogram Graphical display of quantitive data. Data is spread into "stem" and "leaf". It retains the data and sorts. - Answer- Stemplot(stem and leaf plot) Graphically represents the distribution of a quantitive variable. Visually displays the five number summary and the observations classified as a suspected outlier. - Answer- Boxplot Mode, mean, and median. - Answer- Measures of Center The most commonly occurring value. Can be unimodal or bimodal - Answer- Mode The average of a set of observations. The sum of observations divided by the number of observations. (x bar) - Answer- Mean The midpoint of the distribution. (M) - Answer- Median Range, inter quartile range (IQR), standard deviation - Answer- Measures of soread -order the data smallest to largest -if the number(n) of observations is odd (n+1)/2nd spot -if the number(n) of observations is even we have two n/2 = spot & n/2 + 1 = spot - Answer- How to find the median Mean - Answer- Measure of center that is sensitive to outliers Median - Answer- Measure of center that is not sensitive to outliers Mean and median will be approximately equal - Answer- Symmetric distributions Mean will be greater than the median - Answer- skewed right Mean will be less than the median - Answer- skewed left The exact distance between the smallest data point and the largest. The most intuitive measure of variability. - Answer- range Measures the variability of a distribution by giving us the range covered by the MIDDLE 50% of the data. - Step 1: Arrange the data in increasing order, and find the median - Step 2: Find the median of the lower 50% of the data = 1st qua