WGU C955, Top Exam Questions and answers, 100% Accurate, rated A+

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WGU C955, Top Exam Questions and answers, 100% Accurate, rated A+ median vs IQR - ✔✔-skewed data uses these for center and spread Histogram - when to use - ✔✔-Based on the shape of the di ... stribution, uses mean + standard deviation OR median + IQR to describe center and spread - Larger data sets; shows shapes of distribution and potential outliers; ignores the individual data valuesl Histogram Skewed right - ✔✔-Not a symmetric distribution, the tail is on the right Standard Deviation Rule - ✔✔-68% of the data are within 1 standard deviation, 95% are within 2, 99.7% are within 3 standard deviations from the mean. Scatter plot - ✔✔-A graphical representation of Q -> Q If relationship is linear (confirmed using the scatterplot), use the correlation coefficient to describe strength of relationship and the least-squares regression line to make predictions Two way table - ✔✔-A graphical representation of C -> C Relative frequencies OR conditional percentages for each row/column of the explanatory variable Side-by side box - ✔✔-A graphical representation of C -> Q 5-number summaries of the response variables Interpolation - ✔✔-Making predictions *within* the range of your data. This is usually accurate. Extrapolation - ✔✔-Making predictions *outside* of the range of your data. This is generally a bad idea. predictions for data larger than the maximum x-value or smaller than the minimum x-value of the known data points Simpson's Paradox - ✔✔-When split up, each data set can have a pattern which goes away when all the data is combined. can only occur when the sizes of the groups are inconsistent Population - ✔✔-The group you want to study Sampling frame - ✔✔-the list of people or things you pull the sample from Sample - ✔✔-the subset of the population that is actually being studied Simple random sample - ✔✔-participants are randomly chosen from the entire population Voluntary sample - ✔✔-researchers invite everyone in the sampling frame to participate,those who respond make up the sample. Cluster sample - ✔✔-some groups are chosen, all people within those groups are studied Stratified sample - ✔✔-all groups are chosen, only some people within each group arestudied P(A)*P(B) - ✔✔-independent events: P(A and B) = P(A|B) or P(BIA) - ✔✔-P(A and B) ÷ P(B) or P(A and B) ÷ P(A) P(A or B) - ✔✔-P(A) + P(B) - P(A and B) Box plot - ✔✔-Larger data sets; shows the 5-number summary, shows spread; ignores individual data values and the number of values (allowing to compare sets of different sizes) Farenheit to Celsius - ✔✔-C= 5/9 (F-32) Celsius to Fahrenheit - ✔✔-F= 9/5 (C+32) Dot Plot - When to use - ✔✔-Smaller data set; useful to display the distribution and show gaps and outliers Bar chart - when to use - ✔✔-Category counts or frequencies - When displaying counts or frequencies for each category individually Stem plot - when to use [Show More]

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