APPLIED HEALTHCARE STATISTICS EXAM (LATEST 2023/ 2024 UPDATE) | QUESTIONS AND VERIFIED ANSWERS| 100% CORRECT| GRADE A

"one in every thousand people (0.001) of all individuals are infected with HIV (H) - give equasion - ANSWERS-P(H) = .001 .A dotplot - ANSWERS-Is another type of display used to summarize a quantitative variable graphically. .A histogram is a display of - ANSWERS-a single quantitative variable .A left skewed distribution - ANSWERS-Has a tail which curves up to the left. .a negative scatterplot - ANSWERS-moves downward and relatively straight .a neither positive or negative scatter plot can take on any number forms, even a U - ANSWERS-can take on any number of forms, even a U shape .A pie chart is a display for - ANSWERS-visualizing the distribution of categorical data .a positive scatter plot - ANSWERS-moves upward and relatively straight .A right skew distribution - ANSWERS-has a tail that curves down to the right .A scatterplot compares - ANSWERS-two quantitative variables .A scatterplot is a display of - ANSWERS-two quantitative variables .A two way table compares - ANSWERS-two groups of categorical data .A two way table is a display of - ANSWERS-the relationship of two variables that are both categorical .average of the squared deviations - ANSWERS-variance .Boxplots are most useful when presented - ANSWERS-side-by-side to compare and contrast distributions from two or more groups. .By distribution of a variable, we mean - ANSWERS-what values the variable takes and how often the variable takes those values .Can skewed distribution be bimodal? - ANSWERS-yes .Equation for determining an outlier - ANSWERS-1.5(IQR) = amount added to Q3 or Subtracted from Q1 .equation for mean - ANSWERS-a+b+c/3 (The denominator is always the number of variables added .For a boxplot, the median describes the center, and the extremes (which give the range) and - ANSWERS-the quartiles (which give the IQR) describe the spread. .For r, a correlation less than 0.5 is generally described as - ANSWERS- .For r, a correlation greater than 0.8 is generally described as - ANSWERS-strong .For r, perfect correlation of ± 1 occurs only when - ANSWERS-he data points all lie exactly on a straight line. If r = +1, the slope of this line is positive. If r = -1, the slope of this line is negative. .How do we build a two-way table of probabilities? - ANSWERS-Horizontally, A, not A and total, Vertically, B. not B and total .How does one calculate the standard deviation? - ANSWERS-Square each of the deviations: then,Average the square deviations by adding them up, and dividing by n - 1, (one less than the sample size): .If A and B are disjoint events - - ANSWERS-P(A and B)= 0 .If A and B are two independent events (Multiplication Rule) - ANSWERS-P(A and B) = P(A) * P(B). .If A and B Disjoint - ANSWERS-A and B can not be indepentdent .if A, B and C are three independent events, - ANSWERS-P(A and B and C) = P(A) * P(B) * P(C) .IF person is HIV positive and test accuracy is .95, what are the chances that that person will test negative (give equation) - ANSWERS-P(not T | H) = 1 - P(T | H) = 1 - .95 = .05. .If someone actually has HIV, the probability of testing positive is .95" (H) give equasion - ANSWERS-P(T | H) = .95 .In a probability tree, overall probability of V, in the event of C or not C is determined by what sequence of equasions? - ANSWERS-Applying the Addition Rule for Disjoint Events, we have P(V) = P(C and V) + P(not C and V). Applying the General Multiplication Rule to each term, we have P(V) = P(C) * P(V | C) + P(not C) * P(V | not C) .In a probability tree, symbolically, V = (C and V) or (not C and V). Thus, the overall probability of taking the vacation is - ANSWERS-P(V) = P( (C and V) or (not C and V) ). .In a probability tree, the probabilities in the first branch-off are - ANSWERS-non-conditional probabilities .In a probability tree, the second thing to note is that probabilities of branches that branch out from the same point always add up to - ANSWERS-one .In a probability tree,second branch-off are - ANSWERS-conditional probabilities. .In a two-way table of probabilities, what is the total of all outcomes (lower right corner?) - ANSWERS-1 .In case C→C we compared - ANSWERS-distributions of the categorical response. .In case C→Q we compared - ANSWERS-distributions of the quantitative response. .In general, another method for checking the independence of events A and B is to compare - ANSWERS-P(A and B) to P(A) * P(B). If the two are equal, then A and B are independent, otherwise the two are not independent. .In probability, "OR" means either one or the other or both. - ANSWERS-P(A or B) = P(event A occurs or event B occurs or both occur) .In stemplots, - ANSWERS-the leaf is the right-most digit .IQR = (Interquartile Range) - ANSWERS-Q3-Q1 (Median of the third quartile minus the median of the second quartile .Median - ANSWERS-The midpoint of a distribution .Mode - ANSWERS-the most commonly occurinng value in a dataset .Negative correlation: (r) - ANSWERS-If x and y have a strong negative linear correlation, r is close to -1. An r value of exactly -1 indicates a perfect negative fit. Negative values indicate a relationship between x and y such that as values for x increase, values for y decrease. .No correlation: (r) - ANSWERS-If there is no linear correlation or a weak linear correlation, r is