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UNB/Year 4/Semester 2/STAT2593/2024-02-14.md

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+Lecture Topic: Midterm Review 1
+
+Will be Wednesday, Feb 21, 2024
+Covers Lectures 1-13, Chapters 1-3
+All multiple choice, 18-20 Questions for 50 mins, 16-17 as it is 45 minutes
+45 Minutes, Show up early
+Choose closest answer if answer does not line up
+YOU NEED A CALCULATOR FOR THIS
+
+For your formula sheet, you can put anything on it, 1 regular size sheet (11x8.5), both sides are allowed to be written on.
+
+Questions from base theorem will likely take longer than others, so look for questions that are easier to solve first
+
+## Basic Statistics
+Mean - $\frac{\sum x}{n}$
+Median - Middle Most value, even is the average of two middle values
+Mode - Most frequent value
+Quartile 
+- Q1 - 25%, In between 0 and median
+- Q2 = Median
+- Q3 = 75% In Between median and 100
+- Q4 = 100%
+
+## Variance
+IQR - Inter quartile range - Q3 - Q1
+Variance
+- $\frac{1}{n-1} \sum (x_i - x)^2$ or $\frac{\sum(x_i - x)^2}{n-1}$
+- $\frac{1}{n-1} \sum (x_i^2) - nx^2$ Ask about this, didn't quite catch on board
+- must be positive
+std deviation - Square root of variance, $\sqrt{V(x)}$
+Upper and lower fence - Outlier limits
+- UF = Q3 + 15 IQR Ask about this, could have been 1 times 5, board was messy
+- LF = Q1- 15 IQR Ask about this, could have been 1 times 5, board was messy
+Z score - $\frac{x - \mu}{\sigma}$
+Coefficient of variation / CV = $\frac{\mu}{\sigma} * 100$
+If sigma is not know, replace with S, sample standard deviation