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MATH 125Q

Test 1

QuestionAnswer
Population the entire group you want info about
Sample a subset of the population used to collect data
Parameter numerical value describing a population
Statistic numerical value describing a sample
Quantitative numerical data - can associate with interval/ratio (ex: height, age, test scores)
Qualitative describes qualities - can associate with ordinal/nominal (ex: eye color, name, major)
Discrete counted values - no decimals (ex: # of students, cars)
Continuous measured values - decimals (ex: weight, time)
Nominal names only, no order (ex: eye color, gender)
Ordinal order matters, no equal spacing (class year, rankings)
Interval equal intervals, no true zero (temperature)
Ratio equal intervals, true zero (height, weight, age)
Simple Random Sample each individual has an equal chance of selection
Stratified Sample the population is divided into groups based on a shared characteristic -> then a random sample is taken from each group
Cluster Sample population is divided into clusters and entire clusters are randomly selected
Systematic Sample individuals are selected at a regular interval
Convenience Sample participants are chosen because they are easy to reach
Class Limits smallest and largest values in a class
Class Boundaries values that separate classes
Midpoints middle of each class
Relative Frequency proportion of total
Cumulative Frequency running total of frequencies
Mean average
Median middle value
Mode most frequent value
Range max minus min
Quartiles Q1, Q2/Median, Q3
Inter Quartile Range Q3 minus Q1
Outliers plus or minus 3 standard deviations
Lower Fence of Outliers Q1 - 1.5 (skewed left)
Upper Fence of Outliers Q3 +1.5 (skewed right)
Standard (z) Scores shows how far a value is from the mean
Positive z Score above the mean
Negative z Score below the mean
Addition Rule P(A and B) = P(A) + P(B) - P(A and B)
Multiplication Rule P(A and B) = P(A) x P(B)
Fundamental Counting Principle (!) - multiply choices together
Permutations order matters
Combinations order does not matter
Created by: user-1992551
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