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may someone please help me with statistics psychology? please please?
complete the final two columns in the following frequency distribution table and then use interpolation to find the percentiles and percentile ranks requested:
X f cf c%
10 2
9 5
8 8
7 15
6 10
5 6
4 4
a) What is the percentile rank for X=6?
b) What is the percentile rank for X=9?
c) What is the 25th percentile?
d) What is the 90th percentile?
22) the following frequency distribution presents a set of exam scores for a class of N=20 students.
X f cf c%
90-99 4 20 100
80-89 7 16 80
70-79 4 9 45
60-69 3 5 25
50-59 2 2 10
a) Find the 30th percentile?
b) Find the 88th percentile?
c) What is the percentile rank for the X =77?
d) What is the percentile rank for X = 90?
2 Answers
- Dani GLv 71 decade agoFavorite Answer
basically the cumulative frequency (cf) is the number of subject in or below each category
cumulative percentage (c%) is cf divided by N (# of subjects) . . . . . c% is the percentile (the % of subjects who fell at or below a certain score)
N= 50 (sum of the frequency)
X f cf c%
10 2 50 100
9 5 48 96
8 8 43 86
7 15 35 70
6 10 20 40
5 6 10 20
4 4 4 8
Since I filled in the chart, why don't you try to figure out the questions. Post your answers and we can see if you got them correct.
- NaguruLv 71 decade ago
Normally, whenever I appear in any examination, I first attempt easy questions. Difficult questions, I take up at the end. I think this is a tough question.
Source(s): own
