The SBC GMAT Files
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Here’s a snapshot of the caliber of expertise on our SBC team.
Ashley
Ashley is a former MBA Admissions Board Member for Harvard Business School (HBS), where she interviewed and evaluated thousands of business school applicants for over a six year tenure. Ashley holds an MBA from HBS. During her HBS years, Ashley was the Sports Editor for the Harbus and a member of the B-School Blades Ice Hockey Team. After HBS, she worked in Marketing at the Gillette Company on Male and Female shaving ...
×Kerry
Kerry is a former member of the Admissions Board at Harvard Business School (HBS). During her 5+ year tenure at HBS, she read and evaluated hundreds of applications and interviewed MBA candidates from a wide range of backgrounds across the globe. She also led marketing and outreach efforts focused on increasing diversity and inclusion, ran the Summer Venture in Management Program (SVMP), and launched the 2+2 Program during her time in Admissions. Kerry holds a B.A. from Bates College and ...
×Pauline
A former associate director of admissions at Harvard Business School, Pauline served on the HBS MBA Admissions Board full-time for four years. She evaluated and interviewed HBS applicants, both on-campus and globally. Pauline's career has included sales and marketing management roles with Coca-Cola, Gillette, Procter & Gamble, and IBM. For over 10 years, Pauline has expertly guided MBA applicants, and her clients h ...
×Geri
Geri is a former member of the Admissions Board at Harvard Business School (HBS). In her 7 year tenure in HBS Admissions, she read and evaluated hundreds of applications and interviewed MBA candidates from a diverse set of academic, geographic, and employment backgrounds. Geri also traveled globally representing the school at outreach events in order to raise awareness for women and international students. In additio ...
×Laura
Laura comes from the MBA Admissions Board at Harvard Business School (HBS) and is an HBS MBA alumnus. In her HBS Admissions role, she evaluated and interviewed hundreds of business school candidates, including internationals, women, military and other applicant pools, for five years. Prior to her time as a student at HBS, Laura began her career in advertising and marketing in Chicago at Leo Burnett where she worked on th ...
×Andrea
Andrea served as the Associate Director of MBA Admissions at Harvard Business School (HBS) for over five years. In this role, she provided strategic direction for student yield-management activities and also served as a full member of the admissions committee. In 2007, Andrea launched the new 2+2 Program at Harvard Business School – a program targeted at college junior applicants to Harvard Business School. Andrea has also served as a Career Coach for Harvard Business School for both cu ...
×Jennifer
Jennifer served as Admissions Officer at the Stanford (GSB) for five years. She holds an MBA from Stanford (GSB) and a B.S. in Chemical Engineering from University of Illinois Urbana-Champaign. Jennifer has over 15 years experience in guiding applicants through the increasingly competitive admissions process into top MBA programs. Having read thousands and thousands of essays and applications while at Stanford (GSB) Admiss ...
×Erin K.
Erin served in key roles in MBA Admissions--as Director at Haas School of Business at UC Berkeley and Assistant Director at Stanford's Graduate School of Business (GSB). Erin served on the admissions committee at each school and has read thousands of applications in her career. At Haas, she served for seven years in roles that encompassed evaluation, outreach, and diversity and inclusion. During her tenure in Admissions at GSB, she was responsible for candidate evaluation, applicant outreach, ...
×Susie
Susie comes from the Admissions Office of the Stanford Graduate School of Business where she reviewed and evaluated hundreds of prospective students’ applications. She holds an MBA from Stanford’s GSB and a BA from Stanford in Economics. Prior to advising MBA applicants, Susie held a variety of roles over a 15-year period in capital markets, finance, and real estate, including as partner in one of the nation’s most innovative finance and real estate investment organizations. In that r ...
×Dione
Dione holds an MBA degree from Stanford Business School (GSB) and a BA degree from Stanford University, where she double majored in Economics and Communication with concentrations in journalism and sociology. Dione has served as an Admissions reader and member of the Minority Admissions Advisory Committee at Stanford. Dione is an accomplished and respected advocate and thought leader on education and diversity. She is ...
×Anthony
Anthony served as the Associate Director of MBA Admissions at the Wharton School at the University of Pennsylvania, where he dedicated over 10 years of expertise. During his time as a Wharton Admissions Officer, he read and reviewed thousands of applications and helped bring in a class of 800+ students a year. Anthony has traveled both domestically and internationally to recruit a ...
×Meghan
Meghan served as the Associate Director of Admissions and Marketing at the Wharton MBA’s Lauder Institute, a joint degree program combining the Wharton MBA with an MA in International Studies. In her role on the Wharton MBA admissions committee, Meghan advised domestic and international applicants; conducted interviews and information sessions domestically and overseas in Asia, Central and South America, and Europe; and evaluated applicants for admission to the program. Meghan also managed ...
×Amy
Amy comes from the Wharton School of the University of Pennsylvania where she was Associate Director. Amy devoted 12 years at the Wharton School, working closely with MBA students and supporting the admissions team. During her tenure at Wharton, Amy served as a trusted adviser to prospective applicants as well as admitted and matriculated students. She conducted admissions chats with applicants early in the admissions ...
×Ally
Ally brings six years of admissions experience to the SBC team, most recently as an Assistant Director of Admission for the full-time MBA program at Columbia Business School (CBS). During her time at Columbia, Ally was responsible for reviewing applications, planning recruitment events, and interviewing candidates for both the full-time MBA program and the Executive MBA program. She traveled both internationally and dome ...
×Erin B.
Erin has over seven years of experience working across major institutions, including University of Pennsylvania, Columbia Business School, and NYU's Stern School of Business. At Columbia Business School, Erin was an Assistant Director of Admissions where she evaluated applications for both the full time and executive MBA programs, sat on the admissions and merit scholarship committees and advised applicants on which program might be the best fit for them based on their work experience and pro ...
×Emma
Emma comes from the MBA Admissions Office at Columbia Business School (CBS), where she was Associate Director. Emma conducted dozens of interviews each cycle for the MBA and EMBA programs, as well as coordinating the alumni ambassador interview program. She read and evaluated hundreds of applications each cycle, delivered information sessions to audiences across the globe, and advised countless waitlisted applicants. ×
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GMAT Score Chart: How to Use It?
Standard Deviation
Standard Deviation, (or SD or Sigma, represented by the symbol σ) shows how much variation or dispersion exists from the average (mean, or expected value). In other words, it is a measure of how spread out the numbers of a set are and the GMAT tests how to read these numbers and their relationship to the entirety of the ‘spread’. An analogy: Imagine a paintball gun in your hand and a clean, blank, taintless, squeaky white wall in front of you. Yes, I see the temptation too. And, I would do the same. Point and Shoot! Just for fun, release the inner child who wants to wreak havoc! Where is the math in here? Pay attention to each word in the following sentence. SD is a ‘measure’ of how ‘spread out’ the splash is from the center. A smaller SD means the splatter is small. A larger one means the splatter is big. Since this is GMAT quant, the splatter is comprised of a set of numbers. SIMPLE!
The actual numbers in SD problems don’t matter as much. What is important is how far each term is from the ‘mean.’ The ‘mean’ is: Woah, a math concept where actual numbers hardly matter. DELIGHTFUL! Then what matters – again – ”˜how far is each term from the mean’ matters. Basically, SD on the GMAT is Simple and Delightful. Now I’ll show you why:
Common areas of testing:
(a) If you multiply or divide every term in the set by the same number, the SD will change. SD will change by that same number. The mean will also change by the same number. Imagine the splatter to animatedly increase in size; but proportionately. The ”˜measure of spread’ will change. If every term is doubled, the distance between each term and the mean doubles, BUT also the distance between each term doubles and thus standard deviation increases. If each term is divided by two, the SD decreases.
(b) Adding a number to the set such that the number is very close to the mean generally reduces the SD. Imagine the splatter of paint on the wall. If I were to paint a droplet very close to the center, would it increase or decrease the spread? – Decrease, because now more droplets are closer to the center than before.
(c) Adding a number to the set such that the number is further away from the mean, will increase the SD. This is because the average distance of the numbers from the mean increases.
(d) SD of a set is zero if the range of the set is zero. If all the numbers in the set are the same then the range is zero and the SD is also zero. Consider the set {3, 3, 3, 3, 3}
(e) You need all these three to calculate SD.
– The population of the data set
– The mean of the data set and
– The data points themselves.
Definitions: Now, let’s see if you remember these definitions: arithmetic mean, median, mode, and range of a set of numbers. GMAT uses these building blocks and a few predictable ways to put them together to put together into seemingly complicated problems. ”¨”¨Symbols: It is important to know these so as to translate the math in the question into English.
1) σ read as Sigma is a symbol for Standard Deviation
2) μ pronounced as ”˜myu’ is a symbol for Arithmetic Mean
3) ”˜n’ denotes the number of elements in the set
Common Formula: SD = Square Root of the difference of the mean of the numbers and the square of the mean of the numbers.
Since SD problems in GMAT appear equally as Problem Solving and Data Sufficiency, here is one example of each kind.
Problem Solving:
If 25 students took a test, the average student scored 80% (arithmetic mean), the standard deviation was 5%, and the teacher awards ”˜A’s for those who scored 3 or more standard deviations above the mean, what is the lowest score for which a student could earn an A?
μ = 80% since this is arithmetic mean.”¨Lowest Score to Earn an A: Mean + 3(Standard Deviation)”¨Lowest Score to Earn an A: 80% + 3(5%) = 95%”¨”¨”¨Do you see what I see? The question did not ask for the value of SD. We didn’t calculate the value of SD. But, we needed to know the concept that a student needed to be further away – or more standard deviations away – from the average to get an A. ”¨”¨Data Sufficiency:
Set T consists of odd integers divisible by 5. Is standard deviation of T positive?
(1) All members of T are positive
(2) T consists of only one member
Statement 1 says that all the numbers of the set are positive but they may all be identical. If all the numbers of the set are identical, the range is zero and so is SD. Does that answer the question,’ Is SD positive?’. No, you cannot be sure – SD is either positive or zero. So (1) is not sufficient. ”¨Statement 2 says that the set has only one number. This makes the range zero and hence the SD also zero. Does that answer the question,’ Is SD positive?’. Yes, SD is definitely zero. (2) is sufficient data. ”¨B is the answer then! ”¨”¨”¨Do you see what I see? No calculation at all. Applying the basic concept – that the DISTANCE of the variables from the mean is more important that the actual value of each variable and the mean – is enough.”¨”¨In B-school and later in your career, you will often use this concept in corporate finance and marketing. Again, always think about the ”˜distance between the terms’.
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