BUAL 2600 exam 3 Gramling || 100% SOLVED.
Finding Quartiles, Percentiles, and IQR correct answers Sort data → Q2 is the median → Q1 is
the median of the lower half → Q3 is the median of the upper half → IQR = Q3 − Q1 → For any
percentile, multiply percentile by number of values → if position is whole, average that value
and next → if decimal, round up to next position
Mean correct answers Average of all values
Median correct answers Middle value of ordered data
Mode correct answers Most frequent value
Range correct answers Maximum minus minimum
Variance correct answers Average squared distance from the mean
Standard Deviation correct answers Typical distance values are from the mean
Quartiles correct answers Q1 = 25th percentile, Q2 = median (50th percentile), Q3 = 75th
percentile
IQR correct answers Q3 − Q1; spread of the middle 50% of the data
Outlier correct answers Any value below Q1 − 1.5×IQR or above Q3 + 1.5×IQR
Five Number Summary correct answers Minimum, Q1, Median, Q3, Maximum
Skewed Right correct answers Mean greater than median; long tail on the right
Skewed Left correct answers Mean less than median; long tail on the left
Approximately Normal correct answers Mean approximately equal to median; symmetric shape
Unimodal correct answers One peak in the data
Bimodal correct answers Two peaks in the data
Multimodal correct answers More than two peaks in the data
Z-score correct answers How many standard deviations a value is from the mean
68-95-99 Rule correct answers 68% of data within 1 SD, 95% within 2 SD, 99.7% within 3 SD
Standard Normal Distribution correct answers Normal distribution with mean 0 and SD 1
Finding Quartiles, Percentiles, and IQR correct answers Sort data → Q2 is the median → Q1 is
the median of the lower half → Q3 is the median of the upper half → IQR = Q3 − Q1 → For any
percentile, multiply percentile by number of values → if position is whole, average that value
and next → if decimal, round up to next position
Mean correct answers Average of all values
Median correct answers Middle value of ordered data
Mode correct answers Most frequent value
Range correct answers Maximum minus minimum
Variance correct answers Average squared distance from the mean
Standard Deviation correct answers Typical distance values are from the mean
Quartiles correct answers Q1 = 25th percentile, Q2 = median (50th percentile), Q3 = 75th
percentile
IQR correct answers Q3 − Q1; spread of the middle 50% of the data
Outlier correct answers Any value below Q1 − 1.5×IQR or above Q3 + 1.5×IQR
Five Number Summary correct answers Minimum, Q1, Median, Q3, Maximum
Skewed Right correct answers Mean greater than median; long tail on the right
Skewed Left correct answers Mean less than median; long tail on the left
Approximately Normal correct answers Mean approximately equal to median; symmetric shape
Unimodal correct answers One peak in the data
Bimodal correct answers Two peaks in the data
Multimodal correct answers More than two peaks in the data
Z-score correct answers How many standard deviations a value is from the mean
68-95-99 Rule correct answers 68% of data within 1 SD, 95% within 2 SD, 99.7% within 3 SD
Standard Normal Distribution correct answers Normal distribution with mean 0 and SD 1
