Ap Statistics Unit 5 Progress Check Mcq Part A Question Exam Script Complete Questions And Answers

AP STATISTICS UNIT 5 PROGRESS CHECK MCQ PART A QUESTION
EXAM SCRIPT COMPLETE QUESTIONS AND ANSWERS




◉ how do you find the linear regression line on your graphing
calculator? Answer: plug in x values in L1 and y values in L2, STAT,
CALC, LinReg(ax+b)


◉ what is r? Answer: correlation coefficient, represents whether
data is strong/weak/moderate, negative/positive, and
linear/nonlinear


◉ If a scatterplot shows a strong relationship, what does this mean?
Answer: r value is within the range of 0.8-1, displays a strong
pattern of data


◉ If a scatterplot shows a moderate relationship, what does this
mean? Answer: r value is within the range 0.5-0.79, shows some
pattern/trend


◉ If a scatterplot shows a weak relationship, what does this mean?
Answer: r value is within the range 0-0.49, there is a faint or no
pattern

, ◉ If a scatterplot shows a positive relationship, what does this
mean? Answer: when there is an increase in x, there is an increase in
y, positive rate of change/slope


◉ If a scatterplot shows a negative relationship, what does this
mean? Answer: when there is an increase in x, there is a decrease in
y, negative rate of change/slope


◉ If a scatterplot shows a linear relationship, what does this mean?
Answer: the data forms a line when graphed


◉ If a scatterplot shows a nonlinear relationship, what does this
mean? Answer: the data does not form a line, either forms a curve or
has no pattern at all


◉ what is the quote that you must use when asked to interpret the
r^2 value? Answer: The r^2 value is ___% which means that ___% of
the variation of x-value is accounted for by the LSRL/y-value


◉ formula for r Answer: r = sigma [(Xi-x bar)/Sx][(Xi-y bar)/Sy]


◉ t/f: r measures the strength and direction of linear relationships
ONLY Answer: t