# QNT 275 Week 2 Practice Set

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QNT 275 Week 2 Practice Set

https://zh.scribd.com/document/343514565/Uop-Tutorial

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**QNT 275 Week 2 Practice Set**

Practice Set 2

# Practice Set 2

- List the simple events for each of the following statistical experiments in a sample space.

- One roll of a die.

*Note:* Separate your response with a comma (,). For example 22, 23, 24

- Three tosses of a coin.

*Note:* Use this notation for your answer. heads = H. tails = T. For example HT, TH

- One toss of a coin and one roll of a die.

*Note:* Use this notation. Heads = H or numbers 1, 2, 3, 4, 5, 6 for the dice. For example

H1 indicates heads and dice roll equal to 1.

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- Two students are randomly selected from a statistics class, and it is observed whether or not they suffer from math anxiety. Indicate which are simple and which are compound events.

- Both students suffer from math anxiety.

- Exactly one student suffers from math anxiety.

- The first student does not suffer and the second suffers from math anxiety.

- None of the students suffers from math anxiety.

- A hat contains 40 marbles. Of them, 18 are red and 22 are green. If one marble is randomly selected out of this hat.

- What is the probability that this marble is red (round to two decimal places)?

- What is the probability that this marble is green (round to two decimal places?

- Two thousand randomly selected adults were asked whether or not they have ever shopped on the Internet. The following table gives a two-way classification of the responses.

Have Shopped | Have Never Shopped | |

Male | 500 | 700 |

Female | 300 | 500 |

- If one adult is selected at random from these 2000 adults, find the probability that this adult has never shopped on the Internet.

- If one adult is selected at random from these 2000 adults, find the probability that this adult is a male.

- If one adult is selected at random from these 2000 adults, find the probability that this adult has shopped on the Internet given that this adult is a female.

- If one adult is selected at random from these 2000 adults, find the probability that this adult is a male given that this adult has never shopped on the Internet.

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- Find the joint probability of AAand BB for the following.

- P(A)=.36and P(B|A)=.87

- P(B)=.53and P(A|B)=.22

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- Classify each of the following random variables as discrete or continuous.

- The time left on a parking meter

- The number of bats broken by a major league baseball team in a season

- The number of cars in a parking lot at a given time

- The price of a car

- The number of cars crossing a bridge on a given day

- The time spent by a physician examining a patient

- The number of books in a student’s bag

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