A developmental psychologist measures the time (in seconds) taken by a sample of 8 infants to successfully complete a crawling obstacle course. The recorded times are:
12, 15, 16, 18, 19, 21, 22, 145 12, \; \; 15, \; \; 16, \; \; 18, \; \; 19, \; \; 21, \; \; 22, \; \; 145 12,15,16,18,19,21,22,145The time of 145 seconds is an extreme outlier because the infant stopped to play.
Which measure of central tendency is the most appropriate to represent the typical completion time of this sample, and what is its calculated value?
Median, with a value of 18.518.518.5 seconds
Mean, with a value of 33.533.533.5 seconds
Median, with a value of 19.019.019.0 seconds
Mean, with a value of 18.518.518.5 seconds
513 exam-style questions on OCR A Level Psychology Data recording, analysis and presentation. Each one has a worked solution and a mark scheme showing where the marks go.