Statestik Flashcards
In a probability model, all possible outcomes together must have a probability of 1.
True or False
True
A density curve describes the probability distribution of a discrete random variable.
True or False
False
Mean is resistant to outliers
True or False
False
The probability of succes for binomial distribution must remain the same for each trail.
True or False
True
Since the median is the middle value of a data set it must always be smaller than the mean.
True or False
False
The 75th percentile is referred to as the
First quartile
Second Quartile
Third Quartile
Fourth quartile
Third Quartile
In the normal distribution with mean U and standard deviation O, approximately 95% observations fall within +- 2O of the mean U.
True or False
True
Normal distribution represents _________ random variables
Discrete
Continuos
None of the above
Continuos
The ___ the P-value, the stronger the evidence against the null hypothesis provided by the data.
Smaller
Larger
None of the above
Smaller
Suppose we roll a red die and a green die. Let R be the event that the number of spots showing on the red die is there or less, and G be the event that the number os spots showing on the green die is more than three. The events R and G are ______.
Disjoint
Complements
Independent
None of above
Independent
Suppose that A and B are two disjoint events with P(A) = 0,4 and P(B) = 0,3. What is P(A U B)?
0,70
0,51
0,58
0,60
Vet ej
