Getting Mean
Name That Equation
Vocab
Staty Sampler
Data Disaster
100

Evaluate the mean of this data set:

1,3,3,5,6,6,6

approx. = 4.2857 or 30/7

100

equation for mean?

x̄ = (Σxi) / n

100

what is mean

the average of a data set

100

during what type of distribution are the mean, median, and mode mostly equal?

symmetric/symmetrical distribution

100
what is quantitative data

type of data stored numerically(counted)

200

Evaluate the mean of this data set:

4,5,7,8,8,10,10,11,20

approx. = 9.222 or 83/9

200

equation for STDV?

σ=√Σ(x-x̄)2/n-1

200

what is p-hat

the statistic or sample proportion of a data set

200

What can be inferred from a p value between 0.05-0.10?

the observed data is unlikely to occur

200

what is qualitative data

non-numerical information collected through methods like observation

300

Interpret:

Bob is trying to find the average number of ducks he sees each week during his morning jogs when passing by a lake. 

Week one: four ducks        Week two: zero ducks

Week three: three ducks    Week four: five ducks

Week six: two ducks          Week five: zero ducks

What is the mean of this data set and what does it suggest? 

approx. = 2

On average, Bob sees 2 ducks every week

300

equation for p-hat?

z*√p(1-p)/n       (p=p-hat)

300

what is mode

a measure of central tendency(aka what number/s appear the most)

300
On average, what percent of Americans believe they are smarter than the average American?

55% of Americans believe they are smarter than the average american while 35% believe they are just as smart as the average American

300

what is nominal data?

data that is used to label variables without providing any quantitative value

400
During what time period was mean created OR who created mean?

In the 1600s(1635) Henry Gellibrand first utilized the word ¨meane¨ in a mathematical context

400

equation for margin of error?

z*√p*(1-p)/n

400

what is a dependent variable

the variable that is being measured

400

What percent of Americans believe ghosts/demons are real?

45%, so spooky!

400

what is ordinal data?

a type of qualitative (non-numeric) data that groups variables into descriptive categories

500

Who was the first man to use the mean as the representative value for an aspect of a population OR when?

The Belgian statistician Quetelet (1796-1874)

500

equation for z-score?

z = (x-μ)/σ

500

what is a observational study 

observes individuals and measures variables of interest but does not attempt to influence the responses

500

On average, how much trash does the average american produce a day?

5.91 lbs of waste EVERY DAY

500

what is interval data?

a type of numerical data characterized by equal distances between values on a scale