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Chapter 8: Q.66 (page 481)

Which distribution should you use for this problem ?

Short Answer

Expert verified

The distribution for this problem isN(0.6;0.035).

Step by step solution

01

Given Information

They randomly surveyed 200households and found that in 120 of them.

02

Explanation

The distribution for this problem is

p=0.6

p(1-p)n=0.6(1-0.6)200=0.035

N(0.6;0.035)

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Most popular questions from this chapter

Table 8.2shows a different random sampling of 20cell phone models. Use this data to calculate a 93% confidence interval for the true mean SAR for cellphones certified for use in the United States. As previously, assume that the population standard deviation is 蟽= 0.337.

Phone ModelSAR Phone ModelSAR
Blackberry pearl81201.48
Nokia E71x1.53
HTC Evo Design 4G0.8
Nokia N750.68
HTC Freestyle1.15
Nokia N791.4
LG Ally1.36
Sagem Puma1.24
LG Fathom0.77
Samsung Fascinate0.57
LG Optimus Vu0.462
Samsung Infuse 4G
0.2
Motorola Cliq XT1.36
Samsung Nexus S0.51
Motorola Droid pro1.39
Samsung Replenish0.3
Motorola Droid Razr M1.3
Sony W518a walkman0.73
Nokia 7705Twist0.7
ZTE C79 0.869

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a. x=_______

b. sx =_______

c. n =_______

d. n 鈥� 1 =_______

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If the Census did another survey, kept the error bound the same, and surveyed only 50 people instead of 200, what would happen to the level of confidence? Why?

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