# QNT 275 Week 3 Quiz

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QNT 275 Week 3 Quiz

Chapter 04, Section 4.2, Problem 015

Which of the following values cannot be probabilities of events?

15   0.94       -0.55      1.57       53   0.0  -27  1.0

Select all that apply.

-27

53

0.0

1.0

15

0.94

-0.55

1.57

Chapter 04, Section 4.2, Problem 017

The president of a company has a hunch that there is a 0.30 probability that the company will be successful in marketing a new brand of ice cream. Is this a case of classical, relative frequency, or subjective probability?

Relative frequency probability

Subjective probability

Classical probability

Chapter 04, Section 4.2, Problem 020

Correct.

A regular, six-sided die is rolled once.

What is the probability that a number less than 3 is obtained?

P(a number less than 3 is obtained)=

What is the probability that a number 2 to 5 is obtained?

P(a number 2 to 5 is obtained)=

Chapter 04, Section 4.2, Problem 021

Correct.

A random sample of 1115 adults showed that 539 of them have shopped at least once on the Internet. What is the (approximate) probability that a randomly selected adult has shopped on the Internet?

the tolerance is +/-5%

Chapter 05, Section 5.1, Problem 002a

Correct.

Classify the following random variable as discrete or continuous.

The time left on a parking meter.

Chapter 05, Section 5.1, Problem 002b

Correct.

Classify the following random variable as discrete or continuous.

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

Chapter 05, Section 5.2, Problem 07b

Correct.

The following table gives the probability distribution of a discrete random variable x.

x     0     1     2     3     4     5     6

P(x) 0.12       0.19       0.30       0.15       0.11       0.09       0.04

Find P(x≤2).

P(x≤2)=

exact number, no tolerance

Chapter 05, Section 5.4, Problem 029

Select each of the following experiments that are binomial experiments.

Drawing 3 balls with replacement from a box that contains 13 balls, 6 of which are red and7 are blue, and observing the colors of the drawn balls.

Selecting a few households from New York City and observing whether or not they own stocks when it is known that 30% of all households in New York City own stocks.

Drawing 3 balls without replacement from a box that contains 13 balls, 6 of which are red and 7 are blue, and observing the colors of the drawn balls.

Chapter 04, Section 4.2, Problem 019

Correct.

A hat contains 30 marbles. Of them, 17 are red and 13 are green. If one marble is randomly selected out of this hat, what is the probability that this marble is green?

P(A)=

the tolerance is +/-5%

8th-ed Chapter 04, Section 4.3, Problem 046a

Correct.

A statistical experiment has eight equally likely outcomes that are denoted by 1,2,3,4,5,6,7, and 8. Let event A= and event B=.

The events A and B

mutually exclusive events.