Claim: Fewer than 94% of adults have a cell phone. In a reputable poll of 1179...

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Claim: Fewer than 94% of adults have a cell phone. In a reputable poll of 1179...

Claim: Fewer than 94% of adults have a cell phone. In a reputable poll of 1179 adults, 89% said that they have a cell phone. Find the value of the test statistic.

math Statistics-And-Probability

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Answer 1

Answer #1

Solution :

This is a left tailed test .

The null and alternative hypothesis is

H₀ : p =0.94

H_a : p < 0.94

= 0.89

n =1179

P₀ = 0.94

1 - P₀ =1- 0.94 = 0.06

Test statistic = z

= - P₀ / [P_0
* (1 - P₀ ) / n]

=0.89- 0.94 / [0.94*(1-0.94) /1179 ]

= -7.229

P(z < -7.229) = 0

P-value = 0

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Answer 2

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Claim: Fewer than 94​% of adults have a cell phone. In a reputable poll of 1179...

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