Math 9c Midterms Flashcards
numerical facts that can be a reference or information
data
geting infos from datas -> new understanding
statistics
knowledge communicated from facts
infromation
TWO WAYS TO DO STATISTICS
- Descriptive statistics
- Inferential statistics
graphical summaries and numerical techniques
descriptive statistics
predicts, make conclusions based on a sample of the population
inferential statistics
collection of all possible individuals/objects
population (N)
numerical measurement describing some characteristics of a population
parameter
portion or part of the population
sample (n)
numerical measurement describing some characteristics of a sample
statistic
getting sample from a population
sampling
driving to conclusion about a population based on a sample
inference
data from the entire population
census
estimate population mean weight based on a sample
estimation
test the claim
hypothesis testing
random chosen <– equal chances
simple random sampling
the resulting sample of a simple random sampling
random sample
table that shows classes or intervals
frequency distribution
the number of data points in the class
frequency
distance between lower limits
class width
difference between maximum and minimum data entry
range
sum of lower and upper limits divided by 2
midpoint (classmark)
percentage, divide f by the sample size n
relative frequency
sum of f for that class and the previous ones
cumulative frequency
bar graph for frequency distribution of data set
frequency histogram
numbers that separates the classes so no gaps
class boundaries
saame sa frequency histogram but uses relative frequencies instead and class boundaries
relative frequency histogram
line graph - continues change in frequency
frequency polygon
used to measure the center of data
mean (arithmetic average)
data arranged in a frequency distribution
grouped data
scores arrangement - classes category and frequencies
frequency distribution
the number of observations falling in a category
frequency
divides scores into two equal parts
median (middle score)
scores that occurred most - nominal scale
unimodal - bimodal - trimodal - multimodal
mode (modal score)
