Percentiles

If I tell you that you scored at the 55th percentile on your final exam, you would know:

• 55% of the class scored the same or worse than you did

• You earned a 55% on the exam

• You failed the exam

• 45% of the class scored worse than you did

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The 75th percentile is also know as the

• median
• third quartile
• 1st quartile`
• interquartile range

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You are told that your height is the 70th percentile of all heights for people your age. Which of the following is a correct interpretation of this information?

• Your height is the same as about 70% of all other people your age.

• Your height is the same as or higher than about 70% of all other people your age.

• Your score height is lower than approximately 70% of all other people your age.

• 70% of all people your age are taller than you.

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The Median is also referred to as

• the 25th Percentile

• the 50th Percentile

• the 75th Percentile

• the 100th Percentile

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The five-number summary of the distribution of scores on the final exam in Psych 101 last semester was: 20 40 62 84 100. Which of the following best describes the location of the 60th percentile?

• It is a score of 84

• The 60th percentile is between 62 and 84

• The 60th percentile is between 84 and 100

• The 60th percentile is between 40 and 62

The formula to find the percentile rank when you are given a data value is.

• percentile rank = n/100

• percentile rank = (number of values below) / n * 100 (round to nearest whole number)

• percentile rank = (number of values at or below) / n * 100 (round to nearest whole number)

• percentile rank = (number of values at or below) / 100 * n (round to nearest whole number)

Given the data set: 1, 2, 3, 6, 9, 11, 45, 102, calculate the percentile rank for 11.

• 70^th percentile

• 62.5^th percentile

• 72.5^th percentile

• 75^th percentile

What is the PERCENTILE RANK for the data value of 20 in the given data set.

• 33rd

• 15th

• 25th

• None of the above

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What is the PERCENTILE RANK for the data value of 30 in the given data set.

• 80th

• 75th

• 93rd

• 77th

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Here are the weights (in pounds) of 10 puppies: 4 4 5 7 8 8 8 10 12 13 What is the percentile rank of a 5 pound puppy?

• 30%

• 20th percentile

• 70%

• 30th percentile

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