State:
The variable that represents sample size
What is "n"?
The first of our three conditions to check
What is "random"?
The standardized test statistic we find when testing for difference in proportion
What is z?
The variable for our significance value
What is alpha?
This is the sound a doggy makes
What is "bark"?
This is the variable for our sample proportion
What is p-hat?
The three conditions that must be met before performing a Significance Test for difference in proportion
What are "Random," "10%," and "Large Counts"?
We find this variable by adding together the "yes's" from both samples and dividing by the sum of the sample sizes
What is p-hat?
Our default significance value if none is given
What is alpha equals 0.05?
A name for a baby kangaroo
What is "Joey?"
Our null hypotheses most commonly equal this number.
What is zero?
If we do this, we don't need to do the 10% condition
What is random assignment?
The way we find our p-value if our alternative hypothesis says "less than"
What is "plug z-score into Table A?"
Our conclusion if P<alpha
What is "reject H0"?
Alvin's cohorts in this animal band
Who are Simon and Theodore?
Kara works for a website that is considering sending emails with different types of coupons to its customers. She suspects that coupons offering $10 off will be used more often than coupons offering 20% off. She plans on sending each type of coupon to a separate random sample of users. She'll then test if the proportion of customers who use the $10 off coupon is significantly larger than the proportion who use the 20% off coupon.
Kara's parameters for her significance test
What is
p1 = the proportion of users who use the $10 coupon
p2 = the proportion of users who use the 20% off coupon
or
p2 = the proportion of users who use the $10 coupon
p1 = the proportion of users who use the 20% off coupon
Our 10% rule says that each population must be larger than the sample multiplied by what?
What is "10"?
Wha we do to our P-value if our alternative hypothesis says "does not equal"
Our conclusion if P>alpha
What is "Fail to reject H0?"
A friend of the hound, this mammal has a rather unsettling call
What is "fox"?
Faith is in charge of a website campaign that shows a banner asking users to make a donation when they visit the site. She has two designs for the banner in mind: design A and design B. She suspects that design A will lead to a larger proportion of users making a donation. She wants to test her hypothesis by randomly assigning each user one of the two designs over the course of a week.
These are Faith's parameters and hypotheses
What are
H0: p1 - p2 = 0
Ha: p1 - p2 >0
If p1 = proportion who favor design A
or
H0: p1 - p2 = 0
Ha: p1 - p2 <0
If p1 = proportion who favor design B
Our least favorite condition: the Large Counts conditions says that these must be greater than or equal to ten.
What is p*n and p*(1-n) for both samples?
The z-score if n1=100, p-hat1=0.48, n2=80, p-hat2=0.3, and p-hat=0.4
What is 2.45?
What our P-value tells us
What is "the probability of getting our results if H0 is true?"
Before appearing on Game of Thrones, Peter Dinklage played the nemesis of this furrocious hero
Who is Underdog?