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Normal Distrubutions
Scatterplots/Correlation
Data Collection
Probability
MISC.
100
__% of the observations fall within 2 standard deviations of the mean (mu).
What is 95% of observations.
100
State the response and explanatory variables. -Car weight - accident death rate
What is Response variable- Accident death rate Explanatory variable- Car weight
100

Define Placebo effect?

What is showing a response even when given a placebo?

100
If two events (A and B) have no outcomes in common and can never occur together, if P( A and B) = 0, they are known as.
What is mutually exclusive (disjoint).
100

What is the mean of the following data?

25.4, 29.7, 66.9, 10.8, 48.6, 30.4, 24.3

What is 33.7?

200
What is the formula for a standardized score with known mean and standard deviation?
What is z-score (z) = x- mean ---------------- std. deviation
200
The graph displaying the relationship between 2 quantitative variables measured on the same individuals.
What is a scatterplot
200

What does SRS stand for?

What is Stratified Random Sample?

200
If P(A|B) = P(A) & P(B|A) = P(B), they are known as
What is independent events
200

What is the slope and intercept of the following LSRL?

^time=6.75(years) - 173.4

What is slope = 6.75 & y intercept = -173.4?

300
The density curve: a) is always on the vertical axis b) exactly describes a set of data c) has an exact area of 1 underneath it
What is c) has an exact area of 1 underneath it
300
What letter is used to represent the correlation? a) t b) q c) c d) r e) p
What is d) r. Correlation 'r'
300

Within 30 countries, researchers interviewed 1000 people aged 13-65. Their samples are designed so that they get 500 males and 500 females in each country. What kind of design are they using?

What is a stratified sample?

300
What is the general addition rule formula? P (A or B)
What is P (A or B)= P(A U B)= P(A)+ P(B) -P(A∩B)
300

What is the Empirical Rule?

What is on a normal curve 68% of all value fall with in 1 SD, 95% of all values fall with in 2 SD's & 99.7% of all values fall with in 3 SD's?

400
Alex's score on Exam 1 in his stats class was at the 64th percentile of the scores for all students. His score falls between: a) between the minimum and first quartile. b) between the first quartile and the median c) between the median and the third quartile d) at the mean score of all students.
What is c) between the median and the third quartile
400
The fraction of the variation in the values of y that is explained by the least- squares regression of y on x is a) the correlation b) the slope of the LSRL c) the square of the correlation coefficient d) the intercept of the LSRL e) the residual.
What is c) the square of the correlation coefficient
400

What are the 4 Principles of experimental design?

What is Control, Randomize, Replicate & Block?

400
An athlete suspected of using steroids is given 2 tests that operate independently of each other. Test A has a probability .9 of being positive if steroids have been used. Test B has probability .8 of being positive if steroids have been used. What is the probability that neither test is positive if steroids have been used? a) .72 b) .38 c) .02 d) .28 e).08
What is c) .02.
400

What is a Law of Large Numbers?

What is as we repeat a random process over and over, the proportion of times that an event occurs does settle down to one number? I.E. the probability...

500
The average yearly snowfall in Kiko has a mean of 55 inches. If the snowfall exceeds 60 inches in 15% of the years, what is the standard deviation?
What is 4.83 inches.
500
Which is not a characteristic of the LSRL? a) the slope is always between -1 and 1 b) it always goes through the point (x̄,y-) (x-bar, y-bar) c) it minimizes the sum of squared residuals d) The slope will always have the same sign as correlation e) it is not resistant to outliers
What is a) the slope is always between -1 and 1
500

Occasionally, when I fill my car with gas, I figure out how many miles per gallon my car got. I wrote down those results after 6 fill-ups in the past few months. Overall, it appears my car gets 28.8 miles per gallon.

How might my results be biased?

What is answers may vary?

500

Suppose a loaded die has the following probability model: Outcome: 1 | 2 | 3 | 4 | 5 | 6 | Probability:0.3|0.1|0.1|0.1| 0.1| 0.3| If this die is thrown & the top face shows an odd number, what is the probability the die shows a 1? a) .10 b) .17 c).30 d) .50 e) .60

What is e) .60

500

What is the "Law of Averages"

What is It does not exist?