Block 4 practice questions Flashcards
Three groups of subjects were followed over the course of five years to compare the efficacy of different pharmacological treatments for sideroblastic anemia. The most appropriate statistical analysis to determine the qualitative differences resulting from these treatments would be.
A) Regression analysis
B) Chi-square test
C) F-Test/ANOVA
D) t-test
E) Correlation analysis
C) F-Test/ANOVA
A 56yr old man with chronic hepatitis has a serum alanine aminotransferase (ALT) of 100U/L. How is this lab value best described as a variable?
A) Categorical, ordinal
B) Quantitative, discrete
C) Quantitative, continuous
D) Categorical, nominal
C) Quantitative, continuous
Which of the following statements best describes a type II error
A) Rejecting the null when H0 is false
B) Accepting the null when H0 is false
C) Rejecting the null when H0 is true
D) Accepting the null when H0 is true
B) Accepting the null when H0 is false
A correlation between two variables measures the degree to which they are
A) Positively skewed
B) Mutually exclusive
C) Casually related
D) Statistically significant
E) Associated
E) Associated
Which of the following analytical models is best suited to predict the expected weight of infants in their first year according to their age in months?
A) Simple regression
B) Logistic regression
C) Multiple regression
D) Cox proportional hazards regression
E) Correlation
A) Simple regression
A physician is studying the effects of a Drug A and Drug B on disease X. A test is administered to two groups of subjects (those taking drug B) and compares their mean scores. Which of the following statistical test would be the most appropriate for this purpose?
A) T-test
B) Z-score test
C) ANOVA
D) Chi-square test
A) T-test
A correlation coefficient of zero indicates
A) Statistical significance
B) That there is a possible weak association
C) Causation
D) As the X axis variable changes so does the Y-axis variable
E) The two variables are not related
E) The two variables are not related
A researcher is testing a new, experimental drug designed to reduce BP. What is the alternate hypothesis of the research trial?
A) The experimental drug is not clinically useful
B) The experimental drug increases BP
C) The experimental drug does not have an effect on BP
D) The experimental drug decreases BP
E) The experimental drug has major side effects
D) The experimental drug decreases BP
A researcher found that as vegetable consumption went up, cancer rates went down. How are these two variables related?
A) Zero correlation
B) Vegetable consumption protects against cancer
C) Negative correlation
D) Positive correlation
E) No relationship
C) Negative correlation
A researcher wants to evaluate the effect of changing the titration dosage of blood pressure medication on blood pressure. In this experiment, what kind of variable is “dosage of blood pressure medication”?
A) Random
B) Fixed
C) Dependent
D) Independent
E) Categorical
D) Independent
A study is conducted to examine the relationship between daily caffeine intake and systolic blood pressure. The calculated correlation coefficient r measures which of the following?
A) The statistical significance of the association between daily caffeine intake and BP
B) The likelihood that caffeine intake and systolic BP are mutually exclusive
C) The degree of association between the two study variables
D) The extent to which caffeine intake and BP are casually related
C) The degree of association between the two study variables
Which of the following values of the Pearson’s correlation coefficient (r) best represents an association between two variables which is described as moderate negative correlation?
A) +0.6
B) -0.6
C) -0.3
D) +0.4
E) +0.9
B) -0.6
Which of the following best represents the correlation coefficient between systolic BP and age as determined negligible?
A) +0.70
B) +1.20
C) -0.22
D) -0.85
E) 0
E) 0
Studying the association between plasma levels of renin and changes in BP, a researcher would obtain the most effective use of the data by the application of:
A) Correlation analysis
B) Student’s t-test
C) F-test
D) Chi-square test
E) Analysis of the variance
A) Correlation analysis
Comparing the blood hematocrit value before and after the delivery which of the following statistical test will be most appropriate to be used?
A) Anova
B) Chi square
C) Paired t-test
D) Pearsons correlation
E) t-test
C) Paired t-test
F-test (ANOVA)
Quantitative, Continuous
Accepting the null when H0 is false
Associated
Simple regression
T-test
That the two variables are not related
The experimental drug decreases BP
Negative correlation
Independent
Association between caffeine & BP
-0.6
0
Chi-Square test
Paired t-test
