About Vivian Expertise I can answer questions on probability, distributions, statistical inference, statistical estimation, hypothesis testing, analysis of categorical data, linear regression, generalized linear regression, ANOVA, and linear mixed models. I cannot answer questions on stochastic processes.
Experience I have worked as a research assistant at the University of Michigan, Ann Arbor for two years.
Organizations American Statistical Association
Education/Credentials University of Michigan, Ann Arbor
Master of Science
Question For 75 employees of a large department store, the following distribution for years of service was obtained. How can I construct a histogram, a frequency polygram and ogive, for the data?
class limits frequency
1-5 21
6-10 25
11-15 15
16-20 0
21-25 8
26-30 6
A majority of the employees have worked for how many years or less?
Frequency polygram (lines instead of bars); In statistics, an ogive is the curve of a cumulative distribution function. Build the ogive based on the following function:
Y=21/75 if 1<=x<6, (21+25)/75 if 6<=x<11, (21+25+15)/75 if 11<=x<21, (21+25+15+8)/75 if 21<=x<26, 1 if 30>x>=26.
