Probability
What is the probability of not flipping heads twice in a row?
.25
What test is used in a probability test with one variable
One-Sample Z test
What is the formula to find degrees of freedom in a one sample t test
df= n-1
how to create a table in desmos
type table
or click plus then table
What is the probability of rolling 6 twice in a row on a 6 sided dice
1/36
Used in a hypothesis test to evaluate means when the population standard deviation is unknown, this test statistic relies on degrees of freedom
t-value
What is the formula for the z-score in a one sample z test
actual - expected
------------------- SD
How do you get a 5 number summary
type stats(
The Probability of getting numbers 1-5 on a spinner is different, with the probabilities of 3 and 5 being the same. What is the probability of spinning a 3 given:
P(1)=.34 P(3)=x
P(2)=.28 P(4)=.18 P(5)=x
.10
A test is ran with an alpha=.05. What conclusion can be made with a p-value of .05
Reject Null Hypothesis
What is the formula for degrees of freedom in a Linear Regression t-interval for β
df= n-2
How to create an approximate normal distribution
type normaldist(
or
Click plus, then inference, then Probability distribution
Whats the Law of Large Numbers
As a sample size grows, its mean will get closer and closer to the average of the whole population
The probability of winning a prize is .1, what is the probability of winning on your 8th try
.478
what conditions do you need in a chi squared goodness of fit test
Random
10% condition
Large Counts np>5
What is the formula to find the t-value in a One-sample t-test for μ Or Matched pairs t-interval for μd
t = x̅− μ / (s√n)
When creating a hypothesis test what do the tails of the distribution automatically set to? Left? Both? Right?
Both
Probability of rolling a 7 on a 36 sided die given you rolled an even number the turn before
1/36
A factory uses 3 machines to make batteries. Machine A makes 50% of the batteries, Machine B makes 30% and Machine C makes 20%. Machine A has a 2% defect rate, B has a 3% defect rate, and C has a 5% defect rate. If a randomly selected battery is defective, this is the probability it was made by Machine C.
.3846
62
What is the formula to find the interval for a one sample z-test for proportions
p̂± z∗√p̂(1 − p̂)/n
Homogeneity and Independence