IBHRE Research Methodology Questions and Correct Answers the Latest Update

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IBHRE Research Methodology
Questions and Correct Answers the
Latest Update
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
✓
✓ example:
✓ 2,4,4,5,6 Mode = 4



range


✓ the largest number subtract the smaller number
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✓
✓ example
✓ 1,1,2,3,5,6,range = 6-1 = 5



standard deviation


✓ 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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