WGU C784: Applied Healthcare Statistics (AQO1)

Question 19. Given the linear equation y = 6 + 5x, what is the correct line graph?

A.  Line crossing the y-axis at about 4, passing through about (-1, 0) (y-axis scale 2 to 18)

B.  Line crossing the y-axis at 6, passing through about (1, 11) and (-1, 1)   ✓ Correct

C.  Line crossing the y-axis at about 5, starting at (-1, 0) (y-axis scale 0 to 10)

D.  Line on a y-axis scale of 8 to 20, crossing well above 6

Note: Answer choices are graphs; descriptions are summarized from the screenshots.

Question 20. What is the correct line graph for the following linear equation: y = 2x – 3?

A.  Downward-sloping line crossing the y-axis at about -2 (first graph shown)

B.  Downward-sloping line on a y-axis scale of 4 to -12

C.  Upward-sloping line crossing the y-axis at -3 and the x-axis at 1.5   ✓ Correct

D.  Downward-sloping line crossing the y-axis at about -2 (last graph shown)

Note: Answer choices are graphs; descriptions are summarized from the screenshots.

Question 26. Given the data collected from research on cancer patients (bell curve, μ = 2, σ = 3): What is the skew of the distribution?

A.  Normal   ✓ Correct

Note: Only the first option (Normal) was visible in the screenshot; the other options were not captured.

Question 33. How did the hospital mislead the public by using this graphical display? (Patient Satisfaction Rate bar chart, y-axis starting at 75)

A.  By choosing data to show a positive skew

B.  By beginning the vertical axis at 75   ✓ Correct

C.  By including only five months in the horizontal axis

D.  By picking the months during which the satisfaction was high

Question 34. Number of visits bar chart for January, February and March (y-axis starting at 4,000). What is misleading about the graph?

A.  The y-axis does not start at 0.   ✓ Correct

B.  The bar colors are the same.

C.  The numbers of visits are too similar.

D.  Only three months are represented.

Question 38. A study is conducted to determine the most common blood pressure readings among sleep apnea patients who use a continuous positive airway pressure machine and those who do not. Which numerical measure is appropriate?

A.  Correlation coefficient

B.  Five-number summary   ✓ Correct

C.  Conditional percentages

D.  Regression analysis

Question 39. A study is conducted to determine the most frequent blood pressure reading among patients who consumed more than 10 alcoholic beverages in a week. Which numerical measure is appropriate?

A.  Conditional percentages

B.  Correlation coefficient

C.  Mode   ✓ Correct

D.  Median

Question 40. A study is conducted to determine the relationship between blood pressure readings and the daily use of CPAP machines by sleep apnea patients. The resulting distribution is skewed. Which numerical measure is appropriate to help researchers better understand this distribution?

A.  Interquartile range   ✓ Correct

B.  Moving average

C.  Mean

D.  Midpoint

Question 43. Physicians reviewed patient data on daily exercise and BMI. Non-exercisers: 41.20% low BMI, 58.80% high BMI. Exercisers: 57.70% low BMI, 42.30% high BMI. How can this data be interpreted?

A.  Those with high BMI are more likely to be non-exercisers because 58.8% is greater than 41.2%.

B.  Those with high BMI are more likely to be non-exercisers because 58.8% is greater than 42.3%.   ✓ Correct

C.  Those with high BMI are less likely to be non-exercisers because 41.2% is less than 42.3%.

D.  Those with high BMI are less likely to be non-exercisers because 57.7% is less than 58.8%.

Question 44. Given this scatterplot (HDL Cholesterol and Age): What accurately describes the strength of the distribution and the relationship between the variables?

A.  Strong positive

B.  Strong negative

C.  Weak negative   ✓ Correct

D.  Weak positive

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