AU MATH140: Quantitative Reasoning -
Exam 2 fully solved
Individuals - correct answer ✔✔subjects on which data is collected
- DONT CHANGE
Variables - correct answer ✔✔Any measurable conditions, events, characteristics, or behaviors that are
controlled or observed in a study.
- CAN CHANGE
- QUALITATIVE (colors etc) or QUANTITATIVE (#/ amount)
explanatory variable (independent variable) - correct answer ✔✔Help explain what causes the
dependent variable
- one event NOT rely on other
-present on x-axis - affected by stimulus
**Time = ALWAYS on x-axis
response variable (dependent variable) - correct answer ✔✔A variable that results or changes due to the
experimental variable(independent)
- after one event occurs it CHANGES probability of next event
-present on y-axis
slope - correct answer ✔✔measure of the steepness of a line on a graph, equal to its vertical change
divided by its horizontal change
m=y2-y1/x2-x1
Mean - correct answer ✔✔Average of a distribution
1. Add the data points
2. divide by the number of data points
, (x₁+x₂+x₃...)/n = value
Median - correct answer ✔✔Middle data point in a distribution; half the scores are above it and half are
below it
-EVEN # of data points→ add 2 middle values and divide by 2
Mode - correct answer ✔✔Most frequently occurring data points(s) in a distribution
Distribution - correct answer ✔✔The trend of an arrangement of ALL data points
Frequency distribution - correct answer ✔✔an arrangement of data that indicates how often a particular
score or observation occurs
- all values organized into non-overlapping classes with # of times data points are in each class
Ex. Handedness
R & L = class; Frequency = # of individuals w/ RorL
RIGHT skewed distribution - correct answer ✔✔Histogram has a longer tail of data toward the RIGHT
side
LEFT skewed distribution - correct answer ✔✔Histogram has a longer tail of data toward the LEFT side
Symmetric distribution - correct answer ✔✔vertical line could be drawn at any point on histogram and
both L&R sides are mirror images of eachother
Multi-modal distribution - correct answer ✔✔Histogram has multiple peaks of data throughout the
distribution
-bi, tri, multi
5 Number summary - correct answer ✔✔1. minimum (lowest value)
2. Q1(lower quartile)
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller BravelRadon. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $15.99. You're not tied to anything after your purchase.