Exam 1
No description yet. This curated deck is ready for daily study.
Card preview (24)
Random irregularity in real life data is ______.
Random irregularity in real life data is Noise/Stochasticity
Which of the following is NOT a measure of the center of data? Mean Median Mode Sum of Squares
Sum of Squares
Describe the shape of this distribution
Positively Skewed Right Skewed Follow direction of tail
A null hypothesis needs to be ______. Provable Falsifiable Accepted
Falsifiable
This is an example of a _____ distribution. Normal Negatively Skewed Symmetrical Positively Skewed
Negatively Skewed
Solve the following summation given this data: 20 16 14 15 19
168 We can either multiply each number by 2 before adding them. 40+32+28+30+38 = 168 Or we can add them up and multiply the sum by 2 2(20+16+14+15+19) = 2(84) = 168
Name a common measure of dispersion (more than one correct answer)
Range Variance Standard Deviation Average Absolute Deviation
You gather the following data on GMU students: Grade Level GPA Major GPA is what kind of data? Discrete Ordinal Nominal Continuous
Continuous
Grade Level is what kind of data? Discrete Ordinal Nominal Continuous
Ordinal
What does mean describe? (Possible answer choices center, spread/dispersion)
Center
Variance
Spread/dispersion
Average absolute deviation
Spread/dispersion
Median
Center (N+1)/2 = median data point. Example in a data set of 1,3,4,6,7,8,9 N=7 Median = (7+1)/2 = 4th data point = 6
Range
Spread/dispersion Max-Min
Mode
Center Most frequently occurring number. Distributions can be unimodal, bimodal, or multimodal
Standard deviation
Spread/dispersion SDev = (x-mean)^2 (N-1)
20 1+1 1+2 1+3 1+4 1+5 or (5x1)+(1+2+3+4+5)
60 = 2(1+3) +2(2+3)+2(3+3)+2(4+3)+2(5+3)
What type of data is blood type?
Nominal
What type of data is income level?
Ordinal
What type of data is inventory of supplies?
Discrete
What type of data is hair color?
Nominal
