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Chris Busu

May 2012
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  • Responses: 324


  • BSc, University of Bucharest , 1997
  • MSc, Ovidius, 1999
  • MSc, Stony Brook, 2002


  • Mathematics
  • Statistics
  • Physics
  • Economics

About Chris Busu

Chris Busu, Ph.D. candidate

I am Chris Busu and I live in Queens, New York, USA with my family. I have graduated with a Master’s degree in Applied Mathematics from Stony Brook University of NY and I am working towards getting my PhD degree in Statistics. As a Masters student, my concentration was on Advanced Calculus, Linear Algebra, Probability and Statistics. I also took Physics classes. During my PhD years I have focused on Topics on Probability, Time Series Analysis, Multivariate Statistics and Biostatistics. I worked for a couple of years at Brookhaven National Laboratory in a project which analyzed the aerosol particles. In my open time, I enjoy being a tutor for freshman students and I am tutoring online high school and undergraduate students with their math classes.

Apart from learning and teaching, I enjoy spending time with my family, travelling, and playing soccer. I am also a NFL fan.

I’m available to help students with their assignments and encourage learning via research. I’ll go to the extent of explaining concepts with detailed illustrations and real life examples.

Allow me to help you with difficulties in your assignments.

Have a great day every day!

Chris's BrainMass Content

Solution Library

Choosing a Test for Comparison of a treatment group

Here is the data for the problem:
Researchers wanted to explore self- esteem in adolescent boys and adolescent girls.
Each respondent completed a 10-item self-esteem scale (they chose one rating for each item from a Likert-type scale, 1 = strongly disagree and 5 = strongly agree).
The sum of t READ MORE »

Statistics / Descriptive Statistics / Quantative Analysis of Data / Normal Distribution » 575770

SPSS output

Review the SPSS output file (see attachment) which reports the results of the between-group (independent group) one-way ANOVA to see if the mean alcohol by volume (%) of the beer differs as a function of quality of the brand as rated by a beer expert (in 2012). Answer the following questions based o READ MORE »

Statistics / Hypothesis Testing / Parametric Tests / Student's t-Test » 576385

Probability and Measures of Central Tendency

1. The weight in pounds of ten randomly-selected football players are:

245, 304, 310, 251, 195

185, 230, 264, 315, 196

Find the median of these weights.

2. The price in dollars of a gallon of gasoline at the end of each month is recorded for one year. The results are:


Mathematics / Probability » 390075

Decision Making and Probability

1. The probability of an event
a. is the sum of the probabilities of the sample points in the event.
b. is the product of the probabilities of the sample points in the event.
c. is the maximum of the probabilities of the sample points in the event.
d. is the minimum of the probabilities of t READ MORE »

Mathematics / Probability » 243519

Graphing : Ordered Pairs, Slopes, Intercepts and Line Equations

Complete each ordered pair so that it satisfies the given equation.

7. y _ 3x _ 9: (0, ), ( , 24), (2, )

17. y = -2x+5

Graph each equation. Plot at least five points for each equation.
Use graph paper.
70. x- 2y - 6

71. x - 3y - 6

Find the slo READ MORE »

Mathematics / Algebra / Basic Algebra » 220459
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