Straighterline Introduction to Statistics
Exam Questions and Answers
Four steps in the process of statistics -Answer-1. Producing Data
2. Exploratory Data Analysis
3. Probability
4. Inference
Categorical variable -Answer-places individuals into one of several groups
Two types: nominal and or...
Straighterline Introduction to Statistics Exam Questions and Answers Four steps in the process of statistics -Answer -1. Producing Data 2. Exploratory Data Analysis 3. Probability 4. Inference Categorical variable -Answer -places individuals into one of several groups Two types: nominal and ordinal Quantitative Variable -Answer -represents a measurement or a count Two types: Interval and ratio Nominal Variable -Answer -categorical variables where t here is no natural order among the categories Ordinal variable -Answer -categorical variables where there is natural order among the categories Interval Variable -Answer -a measurement or count for which it makes sense to talk about the difference between va lues, but it does not make sense to talk about the ratio between values; 0 does not represent the absence of quanitity Ratio Variable -Answer -quantitative variables for which it makes sense to talk about the difference between values AND the ratio between values; 0 represents the absence of quantity What type of variable?: eye color -Answer -nominal What type of variable?: socioeconomic status with categories low, med, high -Answer -Ordinal What type of variable?: Temperature -Answer -Interval What type of var iable?: Income -Answer -Ratio Visual display and numerical summary for a single categorical variable -Answer -pie chart or bar chart and category percentages Visual display and numerical summary for a single quantitative variable -Answer -
histogram or stemplo t and descriptive statistics Visual display and numerical summary for C ->C -Answer -Two way table and conditional percentages Visual display and numerical summary for C ->Q -Answer -Side by side box plots and descriptive statistics Visual display and numerical summary for Q ->Q -Answer -Scatterplot and correlation coefficient (r) Standard Deviation Rule -Answer -Approximately 68% of observations fall within 1 sd of the mean, 95% within 2 sd, 99.7% (or virtually all) within 3 sds Interquartile Range (IQR) -Answer -Middle 50% of the data
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 KatelynWhitman. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.49. You're not tied to anything after your purchase.
