Homework SourseThe Wechsler Adult Intelligence Scale scores are calibrated
The Wechsler Adult Intelligence Scale scores are calibrated to vary according to a normal distribution with a mean of 100 and standard deviation of 15. What Wechsler scores cover the middle 50% of the population? In other words, identify the 25th percentile and 75th percentile of the population?
The Wechsler Adult Intelligence Scale scores are calibrated to vary according to a normal distribution with a mean of 100 and standard deviation of 15. What Wechsler scores cover the middle 50% of the population? In other words, identify the 25th percentile and 75th percentile of the population?
The Wechsler Adult Intelligence Scale scores are calibrated to vary according to a normal distribution with a mean of 100 and standard deviation of 15. What Wechsler scores cover the middle 50% of the population? In other words, identify the 25th percentile and 75th percentile of the population?
Solution
so, 25 th percentile = [ 100 - ( 0.6744898* 15) ]......z-score for 25% = 0.6744898
= 89.88265
and 75% percentile = [ 100 + ( 0.6744898* 15) ] = 110.1173...
scores between [ 89.88265 , 110.1173 ] covers the middle 50% of the population......
