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Chapter 5: Q13 (page 197)

In Exercises 7鈥�14, determine whether a probability

distribution is given. If a probability distribution is given, find its mean and standarddeviation. If a probability distribution is not given, identify the requirements that are notsatisfied.

In a survey, cell phone users were asked which ear they use to hear their cell phone, and the table is based on their responses (based on data from 鈥淗emispheric Dominance and Cell Phone Use,鈥� by Seidman et al., JAMA Otolaryngology鈥擧ead &Neck Surgery,Vol. 139, No. 5).

P(x)

Left

0.636

Right

0.304

No preference

0.06

Short Answer

Expert verified

The requirement that x is a numerical random variable is not satisfied.

Step by step solution

01

Given information

The probability distribution for the ear that cell phone users use to hear their cell phone is provided.

02

Identify the requirements for a probability distribution

Let the variable x represents the ear that a cell phone user uses.

The requirements are as follows:

1)The variablex is not a numerical random variable as the variable cannot be numerically expressed.

2) The sum of the probabilities is computed as:

鈭�Px=0.636+0.304+0.06=1

Therefore, the sum of the probabilities is 1.

3) Each value of P(x) is between 0 and 1.

Thus, the requirement that x is a numerical random variable is not satisfied.

Therefore, the mean and standard deviation cannot be computed.

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Most popular questions from this chapter

In Exercises 15鈥�20, refer to the accompanying table, which describes results from groups of 8 births from 8 different sets of parents. The random variable x represents the number of girls among 8 children.

Use the rangerule of thumb to determine whether 6 girls in 8 births is a significantlyhigh number of girls.

Number of girls x

P(x)

0

0.004

1

0.031

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0.109

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0.219

4

0.273

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0.219

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0.109

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In Exercises 7鈥�14, determine whether a probability

distribution is given. If a probability distribution is given, find its mean and standarddeviation. If a probability distribution is not given, identify the requirements that are notsatisfied.

Ted is not particularly creative. He uses the pickupline 鈥淚f I could rearrange the alphabet, I鈥檇 put U and I together.鈥漈he random variable xis the number of women Ted approachesbefore encountering one who reacts positively.

x

P(x)

1

0.001

2

0.009

3

0.030

4

0.060

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