Claim: Fewer than 98% of adults have a cell phone. In a reputable poll of 1200...

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Claim: Fewer than 98% of adults have a cell phone. In a reputable poll of 1200...

Claim: Fewer than 98% of adults have a cell phone. In a reputable poll of 1200 adults, 90% said that they have a cell phone. Find the value of the test statistic.

The value of the test statistic is _______

(Round to two decimal places as needed.)

math Statistics-And-Probability

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Answer 1

Answer #1

Solution :

The null and alternative hypothesis is

H₀ : p = 0.98

H_a : p < 0.98

= 0.90

1 - P₀ = 1 - 0.98 = 0.02

Test statistic = z

= - P₀ / [ $\sqrt$ P_{0 *} (1 - P₀ ) / n]

= 0.90 - 0.98 / [ $\sqrt$ (0.98 * 0.02) / 1200]

= - 0.08 / 0.989941

= - 0.08

The value of test statistic is - 0.08

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Answer 2

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Claim: Fewer than 98% of adults have a cell phone. In a reputable poll of 1122 adults

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Claim. Fewer than 92% of adults have a cell phone

Claim: Fewer than 91% of adults have a cell phone

1. Claim Fewer than 97 % of adults have a cell phone

Claim: Fewer than 98% of adults have a cell phone. In a reputable poll of 1200...

Homework Answers

Add Answer to: Claim: Fewer than 98% of adults have a cell phone. In a reputable poll of 1200...

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Claim: Fewer than 98% of adults have a cell phone. In a reputable poll of 1200...