Units 1-3
What does the empirical rule tell us about normal data?
68% of data falls within 1 standard deviation of mean, 95% falls within 2, and 99.7% falls within 3
Which sampling method creates groups then surveys each person in the group?
Cluster sample
When would I use a 1-prop-z test vs. 1-prop-t test describe a scenario
Define Variability
how far apart data points lie from each other and from the center of a distribution.
What famous food chain was created in MA?
Dunkin Donuts
Which way is this graph skewed (we will draw it)
Skewed right
When two events are independent the outcome of one event ______ the outcome of the other event
Does not affect
Come up with scenario when you would reject and a scenario when you would fail to reject
...
Define Confidence Interval
Two numbers such that the the population mean will land in between the two values
Music icon made headlines in 2002 when he dangled his nine-month-old son "Blanket" over the balcony of a German hotel to greet a crowd of onlookers?
Micheal Jackson
Find a 5 number summary of this numerical data
max 62. Q3 50.5, med 44, Q1 39.5, min 37. IQR =11
What does BINS stand for?
Binary, Independent, Number of trials fixed, Set probability
A fast-food restaurant promotes certain food items by giving a game piece with each item. Advertisements proclaim that 25% of the game pieces are instant winners! To test this claim a frequent diner collects 20 games pieces and gets only 3 instant winners.
What is the Population, parameter, Sample, Statistic?
All game pieces
25%
20 game pieces
3/20 winners 15%
Define Central limit theorem
The sampling distribution of the mean will always be normally distributed, as long as the sample size is large enough
In what state are pickles required to bounce?
New York, Connecticut, South Dakota, Tennessee.
Connecticut
Explain what Z-score is and how to find it
The number of standard deviations a data poit is away from the mean.
(Data point-mean)/standard deviation
How many ways can a race of 10 runners have a 1st, 2nd, and 3rd place finish? (Not the answer just how you would plug into calculator)
10P3
Define the following -
μ ME z*
Population Mean
Margin of error
Set confidence intervals
Name the five response biases
Voluntary response bias, convenience bias, bad sampling, under coverage, nonresponse bias
What are the five Great Lakes?
Erie, Huron, Ontario, Superior, Michigan
For the 2017 sat, the nationwide mean was 106 and the standard deviation was 195. You took the sat that year and scored 1450. Find the z score and what percent did you score better than
2.5%
A simple random sample of 120 Americans was done at the mall on a saturday. Every single person who was asked answered the question “do you feel safe shopping at the mall on a Saturday?” Which type of bias is most likely?
A) under-coverage Bias B) Brilliance bias C) nonresponse bias D) Open response bias
A) Under-coverage bias
A newspaper report claims that 30% of all tea-drinkers prefer green tea to black tea. Leo is the office manager at a company with thousands of employees. He wonders if the newspaper’s claim holds true at his company. To find out he asks a sample of 125 tea drinkers.
What is the Null Hypothesis?
Po= 30%
Law of large numbers
As a sample size grows, its mean gets closer to the average of the whole population.
What city was the Eiffel tower originally intended for?
Barcelona