Unformatted text preview: Student: Grady Simonton
Instructor: Shawn Parvini Date: 2/18/10 Course: Mathll9: Elementary Statistics - Spring 2010 - CRN: 49239 - 16 weeks
Book: Triola: Elementary Statistics, lle Time: 1:57 PM Below are 36 sorted ages of an acting award winner. Find P40 using the method presented in the textbook. 19 21 21 21 23 24 28 32 32 35
37 37 37 42 43 43 45 48 49 52
53 54 55 56 57 57 57 59 59 63
71 71 72 78 78 79 The ﬁrst step in converting from a percentile to the corresponding data value is to arrange the data in order of lowest to
highest. The given data is already sorted, so we can proceed to the next step. k Next compute L = [E] - n where n is the total number of values in the data set and k is the percentile being used. L is a locator that gives the position of a value. (For example, for the 12th value in the sorted list, L = 12.)
To compute L, ﬁrst determine the values of n and k.
n = total number of values in the data set = 36 k = percentile being used = 40 [ﬁlm — 4 36—144
100 ' Find L. L: Now the process differs depending on whether or not L is a whole number. Since L = 14.4 is not a whole number, the
next step is to change L by rounding it up to the next larger whole number. Find the new value of L. L=15 The value of P40 is the 15th value, counting ﬁ‘om the lowest. Thus, P40 = 43. Page 1 ...
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- Spring '10