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Anahi and Fabio Project
Anahi and Fabio Project
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1
What is the empirical rule?
Around 95% of values are within 2 standard deviations of the mean.
Around 68% of values are within 1 standard deviation of the mean.
None of these are correct
Around 99.7% of values are within 3 standard deviations of the mean.
2
What is a formula for combination?
χ2 = [ ( n - 1 ) * s2 ] / σ2
sp2 = pq / (n - 1)
z-score = z = (X - μ)/σ
nCr = n! / (r! * (n-r)!
3
What is the mean of the dataset? (4,8,12,16)
10
12
14
8
4
What is a z-score?
collection of population units, not single population units.
The number of "successes" in a fixed number
Measures how many standard dev. a data point is from the mean
the chance that the interval that will result once data are collected.
5
What is frequency distribution?
a way to organize data by showing how often each value or group occur
refers to the process of randomly assigning values to a dataset
a statistical technique used to eliminate extreme values from a data
a method used to predict future data values based on past occurrences
6
What is the probability of drawing a red card from a standard of 52 cards?
1/3
3/4
1/2
1/4
7
What is the z-score formula?
E(X + Y) = E(X) + E(Y)
μx = n * P
sp2 = pq / (n - 1)
(x - μ) / σ
8
What is the formula for binomial probability?
p = (p1 * n1 + p2 * n2) / (n1 + n2)
s2 = Σ ( xi - x )2 / ( n - 1 )
n C x ⋅ p x ⋅ ( 1 − p ) n − x
b0 + b1x
9
What is a normal distribution?
values cluster around the mean in a symmetric, bell-shaped probability
the chance that the interval that will result once data are collected
the method of comparison
curves that depend on a parameter called degrees of freedom
10
What is "midpoint"?
the point where two line segments intersect.
the middle point of a line segment.
any randomly chosen point along a line segment.
the endpoint of a line segment that divides it into two equal parts.
11
What does "data" mean?
Numerical values, as qualitative information cannot be measured.
A collection of facts, figures, observations, or measurements
a fixed and unchanging set of values that remain constant
A set of randomly generated numbers used to test statistical models.
12
Find P(x=2) in a binomial experiment with n=5, p=0.4, and k=2
0.4694
0.5421
0.3456
0.4398
13
What is statistics?
A method of organizing number in sequences
The science of collecting, analyzing and interpreting data.
A branch of algebra focused on probability
The study of numbers and their relationships
14
What is a Probability Distribution?
None of these answers are correct.
I don't know
Possible values of a random variable and their associated probabilities.
Not possible values of a random variable and their associated probabilities
15
What is a binomial probability experiment?
None of these are correct.
Individual outcomes are not predetermined or predictable
probability of successes on repeated trials which has two possible outcomes
Contains no recognizable patterns or regularities
16
What is a random variable?
Possible values of a random variable and their associated probabilities.
I don't know
None of these are correct
Numerical outcome of a random event.
17
How do you calculate variance?
Find the median, subtract each value, and take the square root.
Square the mean and divide by the total number of values.
Multiply all values together, then find the square root of the sum.
Divide the sum of squared differences by the total number of data points
18
What is the median of (3,7,9,10,12)
9
12
10
7
19
Find the Z-score for x=75 when the μ=60 and σ=10
1.5
1
2
0
20
How many ways can you choose 3 students from a class of 10?
100
105
120
110
