Review on Statistics & Probability (Q3)

What variable that functions as assigns values to each of an experiment’s outcomes?

• probability distribution

• random variable

• range space 

• sample space

It is random variable that takes an uncountable number of potential values

• continuous

• discrete

• qualitative

• variable

It is the set of all possible values for a given random variable.

• Probability Distribution  

• Random Variable

• Range Space

• Sample Space

A coin is tossed Use H to represent the head and T to represent the tail. What is the sample space in the situation?

• {0,1}

• {1}

• {T}

• {T,H }

Suppose three cell phones are tested at random. Let D represent the defective cell phone and let N
represent the non-defective cell phone. Let X be the random variable for the number of non-defective cell phones. What are the possible outcomes in the given situation?

• {0,1,2,3}

• {1,2,3}

• {DDD, DDN, DND, DNN}

• {DDD, DDN, DND, DNN, NNN, NND, NDN, NDD}

It is a listing of values of a discrete random variable together with its associated probability.

• Probability Distribution  

• Random Variable

• Range Space

• Sample Space

Which of the following is NOT part of the three major points to consider about the sampling distribution of the sample mean?

• The EV or expected value or mean of sample means is equal to the population mean μ.

• The SE or standard error or standard deviation of sample means can be computed when population variance is known.

• The shape is approximately normal, provided the sample size is large enough, and regardless of the shape of parent distribution.

• All statements are correct.

What is the probability of getting a red heart from a deck of 52 cards?

• 0

• 1/4

• 1/2

• 1

What is the probability that the demand will be at least one but lesser than five?

• 0.40 

• 0.44

• 0.58

• 0.74

The variance of a discrete random variable X is 8, what is its standard deviation?

• 2

• 2√1

• 2√2

• 2√3