What is T= (x1-x2)/ Square-root of (s1/N1) + (s2/N2)
100
Sampling design in which entire groups are chosen at random
What is cluster sampling?
100
The probability that a coin lands on heads the first time
What is .5?
100
Show a bar representing the count of each category in a categorical variable
What is a bar chart?
200
The z-value when
Ho: p = .5
Ha: p > .5
p-hat = .467
SD: .034
What is -.971
200
The equation used to find the Standard Error of a one-sample z-test
What is the square root of p-hat times q-hat divided by n.
200
Type of study in which subjects who are similar in ways not under study may be grouped together and then compared with each other on the variables of inerest
What is matched pairs?
200
Probability that a coin lands on heads two times in a row
What is .25?
200
Graphs a dot for each case against a single axis
What is a Dotplot?
300
Ho: p = .5
Ha: p > .5
z= -.805
This is the p-value for this experiment.
What is .788
300
The way to find degrees of freedom for a chi-squared independence test
What is (r-1)(c-1)?
300
Treatment known to have no effect, administered so that all groups experience the same conditions
What is placebo?
300
if A and B are independent events, the probability of A and B is P(AB)=p(A) x p(B)
What is the multiplication rule?
300
When a distribution is non-symmetric and one tail stretches out farther than the other
What is skewed?
400
The probability that a new car has some kind of defect, given that 29% of cars have a cosmetic defect when delivered to car dealers, 7% have a functional defect, and 2% have BOTH problems
What is .34 (.29 + .07 - .02)
400
The National Center for Education Statistics monitors many aspects of elementary and secondary education nationwide. Their 1996 numbers are often used as a baseline to assess changes. In 1996 34% of students had not been absent from school even once during the previous month. In the 2000 survey, responses from 8302 students showed that this figure had slipped to 33%. To test if this difference is meaningful a _________ test would need to be conducted.
What is one-sample z-test?
400
Type of bias that is problematic because some groups are not represented in the sample
What is undercoverage?
400
Two events that share no outcomes in common. Also known as "mutually exclusive"
What is disjoint events?
400
Lists the categories in a categorical variable and gives the counts or percentage of observations for each category
What is a frequency table?
500
In a rural area, 30% of wells have water within 100 feet. You check with consumers in the area and find that 27/80 of the wells find water within 100 feet. This is EQUATION needed to find the STANDARD DEVIATION for this z-test.
SD(P-hat)= The Square Root of (p0q0/n)
500
The equation for a t-interval
What is (Mean) +/- t* (standard deviation/square root of n)
500
The natural tendency of randomly drawn samples to differ from one to another
What is sampling variability?
500
DOUBLE JEOPARDY (Add Double the Points!)
What you must do before any probability problem
What is DRAW A PICTURE?
500
-Square of the correlation between y and x
-Gives the fraction of the cariablility of y accounted for by the least squared regression on x
-Is an overall measure of how successful the regression is in linearly relating y to x