Probability Probz
If P(A|B)= P(A) and P(B|A)=P(B) then A & B are ________ events.
What is independent?
The mayor of a large town wanted to estimate the proportion of citizens who approve of building a new stadium. He surveys an SRS of 765 people and 343 said yes they are in favor. Calculate a 95% confidence interval for the true proportion of citizens who approve of the new stadium.
What is (0.41, 0.48)?
Analysis of data from a statistical study shows a linear relationship in the data with a correlation coefficient of -0.524.
The strength AND direction of the data would be...
What is moderate & negative?
Bella recorded data and used her graphing calculator to find the equation for the line of best fit. She then used the correlation coefficient to determine the strength of the linear fit. Which correlation coefficient represents the strongest linear relationship?
A. 0.9 ; B. 0.5 ; C. -0.3 ; D. -0.8
What is A. 0.9?
The test is on this day
What is Thursday, May 4th?
Given the probabilities P(A) = 0.4 and P(A ∪ B) = 0.6, the probability P(B) if A and B are mutually exclusive is...
What is 0.2?
Find the correlation coefficient, r, for:
Time spent on electronic device | Math Test Score
3 | 85
1 | 99
4 | 81
0 | 98
3 | 90
7 | 65
5 | 78
2 | 90
What is -0.97?
For a distribution that is skewed to the right, usually the mean will be _________ than the median.
What is larger?
A measurable characteristic about an entire population is:
A. an experiment
B. a parameter
C. a population
D. a sample
E. a statistic
What is B. a parameter?
The test location is
What is Room 1512?
Sixty-five percent of all divorce cases cite incompatibility as the underlying reason. If four couples file for a divorce, what is the probability that exactly two will state incompatibility as the reason?
What is 0.311?
Heights of college women have a distribution that can be approximated by a normal curve with a mean of 65 inches and a standard deviation equal to 3 inches. About what proportion of college women are between 65 and 67 inches tall?
What is 25%?
The formula to calculate an upper outlier is...
What is Upper Outlier > Q3 + 1.5(IQR) ?
The expected value of a random variable is the
A. value that has the highest probability of occurring.
B. mean value over an infinite number of observations of the variable.
C. largest value that will ever occur.
D. most common value over an infinite number of observations of the variable.
What is B. mean value over an infinite number of observations of the variable?
The test time is
What is 12/noon?
A computer technician notes that 40% of computers fail because of the hard drive, 25% because of the monitor, 20% because of a disk drive, and 15% because of the microprocessor. If the problem is not in the monitor, what is the probability that it is in the hard drive?
What is 0.533?
When rolling a die 100 times, what is the probability of rolling a "4" exactly 25 times?
What is about 0.0098 or 0.010?
Name 3 measures of spread.
What are range, IQR, min to max, standard deviation, variance?
The probability is p = 0.80 that a patient with a certain disease will be successfully treated with a new medical treatment. Suppose that the treatment is used on 40 patients. What is the "expected value" of the number of patients who are successfully treated?
A. 40 ; B. 20 ; C. 8 ; D. 32
What is D. 32?
You must report to the testing location by this time
What is 11:30 am?
Suppose that 60% of students who take the AP Statistics exam score 4 or 5, 25% score 3, and the rest score 1 or 2. Suppose further that 95% of those scoring 4 or 5 receive college credit, 50% of those scoring 3 receive such credit, and 4% of those scoring 1 or 2 receive credit. If a student who is chosen at random from among those taking the exam receives college credit, what is the probability that she received a 3 on the exam?
What is 0.178?
The average number of pushups a US Marine does daily is 300, with a standard deviation of 50. A random sample of 36 Marines is selected. What is the probability that the sample mean is at most 320 push-ups?
What is 0.9918?
What is r has no units?
A random sample of size 16 is to be taken from a normal population having mean of 100 and standard deviation 2. What is the 90th percentile of the distribution of x-bar?
A. 97.44
B. 100.08
C. 100.32
D. 100.64
E. 102.56
What is D. 100.64?
You must go to this lunch on the day of the test
What is A lunch?