Vocab
Population Vs. Sample. Give an example of both.
Population: all individuals, objects, or measurements whose properties are being studied
Sample: a subset of the population studied
Population=Humboldt state students
Sample= Stats 108 students
What is Random Sampling?
Cluster Sampling:a method for selecting a random sample and dividing the population into groups (clusters); use simple random sampling to select a set of clusters. Every individual in the chosen clusters is included in the sample.
Random Sampling:a method of selecting a sample that gives every member of the population an equal chance of being selected.
IQR=Q3–Q1
What is Probability?
Probability:a number between zero and one, inclusive, that gives the likelihood that a specific event will occur
What is a flock of crows called?
A Murder
Define mean, median, and mode.
Median: the middle number within the data set.
Mode: the value that appears most frequently in a set of data
Mean: a number that measures the central tendency of the data( add them all up and divide by the amount of data values)
What is Cluster Sampling?
Cluster Sampling:a method for selecting a random sample and dividing the population into groups (clusters); use simple random sampling to select a set of clusters. Every individual in the chosen clusters is included in the sample.
Draw a box plot and label all of the parts...
Box plot
The Conditional Probability of A GIVEN B
P(A|B) is the probability that event A will occur given that the event B has already occurred.
What is your brain mostly made of?
60% fat
Histogram vs. Box plot
Box plot: a graph that gives a quick picture of the middle 50% of the data
Histogram:a graphical representation in x-y form of the distribution of data in a data set; x represents the data and y represents the frequency, or relative frequency. The graph consists of contiguous rectangles.
Sampling with Replacement vs. Sampling without Replacement
Sampling with Replacement:Once a member of the population is selected for inclusion in a sample, that member is returned to the population for the selection of the next individual.
Sampling without Replacement:A member of the population may be chosen for inclusion in a sample only once. If chosen, the member is not returned to the population before the next selection.
Can you find Q1, Median, and Q3 with the following data set.
1,1,2,3,6,8,10,12,14
median=6
Q1=2
Q3=10
Tree diagram vs. Venn diagram
Tree Diagram:the useful visual representation of a sample space and events in the form of a “tree” with branches marked by possible outcomes together with associated probabilities (frequencies, relative frequencies)
Venn Diagram:the visual representation of a sample space and events in the form of circles or ovals showing their intersections
What color was the stop sign before it was red?
Yellow
Percentile
Percentile: a number that divides ordered data into hundredths; percentiles may or may not be part of the data. The median of the data is the second quartile and the 50th percentile. The first and third quartiles are the 25th and the 75th percentiles, respectively.
Parameter vs Statistics...
Parameter:a number that is used to represent a population characteristic and that generally cannot be determined easily
Statistic:a numerical characteristic of the sample; a statistic estimates the corresponding population parameter.
What is skewed and show me examples of both.
Skewed:used to describe data that is not symmetrical; when the right side of a graph looks “chopped off” compared the left side, we say it is “skewed to the left.” When the left side of the graph looks “chopped off” compared to the right side, we say the data is “skewed to the right.” Alternatively: when the lower values of the data are more spread out, we say the data are skewed to the left. When the greater values are more spread out, the data are skewed to the right.
The Or Event vs The OR of Two Events
The Or Event:An outcome is in the event A OR B if the outcome is in A or is in B or is in both A and B.
The OR of Two Events:An outcome is in the event A OR B if the outcome is in A, is in B, or is in both A and B.
Who paid $10,000 for artwork that is invisible?
James Franco
Independent Events vs Mutually Exclusive
Independent Events:The occurrence of one event has no effect on the probability of the occurrence of another event. Events A and B are independent if one of the following is true:
Mutually Exclusive:Two events are mutually exclusive if the probability that they both happen at the same time is zero. If events A and B are mutually exclusive, then P(A AND B) = 0.
What is Stratified Sampling?
Stratified Sampling:a method for selecting a random sample used to ensure that subgroups of the population are represented adequately; divide the population into groups (strata). Use simple random sampling to identify a proportionate number of individuals from each stratum.
what is an Outlier? how do you find them?
Outlier: an observation that does not fit the rest of the data
(1.5)(IQR)- Q1
(1.5)(IQR)+Q3
P(A AND B) = P(A|B)P(B) which rule is this?
The multiplication rule.
What is the name for the fear of long words?
hippopotomonstrosesquippedaliophobia!!!