Q1. Match each of the following descriptions to explain the relationship shown in the scatter plot.
Note that each description is used only once.
1. Positive weak, linear relationship
2. Positive, strong, linear relationship
3. No relationship, r = 0
4. Nonlinear relationship
5. Negative, moderate, linear relationship
6. Negative, strong, linear relationship
Diagram A _____
Diagram B _____
Diagram C _____
Diagram D _____
Diagram E _____
Diagram F _____
Q2. Use the following correlation coefficient matrix to answer parts (a) through (c):
Diabetes BMI > 25 Age > 65
Living alone Below
Diabetes 0.63 -0.13 0.34 0.73 0.51
BMI >25 -0.84 -0.04 0.79 0.43
Age > 65
0.15 -0.33 -.05
Living alone 0.31 0.25
a. Which two variables have the weakest correlation between them (regardless of whether the
relationship is positive/negative)?
b. Which two variables have the strongest correlation between them (regardless of whether the
relationship is positive/negative)?
c. For each of the following pairs of variable, specify
r, the correlation coefficient between each pair of variables
the direction of the correlation
the strength of the linear relationship according to Cohen’s scale
1) Living Alone and Below Poverty Line
2) Age > 65 Years and Female
3) BMI > 25 and Diabetes
Q3. Which type of reliability is illustrated by the scenarios in (a) through (c)? Choose from among
test-retest alternate forms split half inter-rater
a) An instrument developer administers a 20-item multiple choice test (with each item having 4
answer options) to a single group of examinees. Scores on the even numbered questions are
correlated with scores on the odd numbered questions.
b) A test developer creates 40 questions to address a provider’s confidence in supporting
patients’ alcohol reduction. The questions are then randomly divided into 2 questionnaires of
20 questions each, and both questionnaires are given to 50 providers. The correlation between
scores on the two questionnaires is then computed.
c) To examine the reliability of an anxiety instrument, it is administered twice to the same
group of subjects, 6 months apart. _____________________
Q4. For each of the following, determine which type of validity is being assessed regarding a
knowledge scale for nurses concerning support for their patients' smoking cessation.
Content validity Criterion validity Construct validity
a) The correlation of scores on this knowledge scale with another well accepted knowledge
scale to support patients' smoking cessation is assessed. ___________________
b) A group of experts examined the knowledge scale to be certain that it covered all aspects of
the knowledge that nurses are expected to have about smoking cessation.
c) Past research has indicated that knowledge to support patients' smoking cessation differs
for nurses working less than 10 years and those working 10 years or more. A determination
was made of whether scores on a new knowledge scale to support patients' smoking cessation
were lower for nurses working less than 10 years than for nurses working 10 years or more.
Q5. The figure above represents the ratings of two examiners for 40 subjects regarding an
assignment scored from 4 to 8.
Which of the following could represent the Pearson’s r between the two examiners?
4 4.5 5 5.5 6 6.5
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