IBHRE Research Methodology Questions and Correct Answers the Latest Update
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Course
IBHRE CEPS
Institution
IBHRE CEPS
mean
the average
find total number of numbers then divide by the amount of numbers
example:
1,3,4,5, mean = (1+3+4+5)/4 = 3.25
median
the middle value when numbers are in order
example:
1,3,6,8,9 median = 6
45, 56, 123 median = 56
mode
the value that is written the most
...
✓ square root variance use to measure how tightly points are clustered around mean
✓ most medical work requires +/- 2 standard deviations to be statistically significant
✓ shown on a graph is histogram
null hypothesis
✓ predicts there is no relationship between two variables
✓ rejecting the null hypothesis means the P value is less than or equal to your
significance level
P-value
✓ how likely it is your data would have occurred under the null-hypothesis of your
given test
✓ - ranges from 0 (total certainty) to 1.0 (total uncertainty)
✓ - smaller than 0.01 (1%) is adequate for medical statistic probability
correlation coefficient
✓ measures the strength of relationship between variables
✓ measured R value = regression coefficient
✓ you want a tight correlation (closer to 1.0 the better)
✓ one variable can predict the other
✓ shown on a graph known as a scatter plot
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