A poll of 2,077 randomly selected adults showed that 92% of therm own cell phone

Question

A poll of 2,077 randomly selected adults showed that 92% of therm own cell phones. The technology display below results from a test of the claim that 90% of adults own cell phones. Use the normal distribution as an approximation to the binomial distribution, and assume a 0.05 significance level to complete parts (a) through (e). Test of p:0.9 vs p #0.9 Sample XN Sample p 95% CI 1909 2,077 0.9191140.907388,0.930840) 2.90 Z-Value P-Value 0.004 a. Is the test two-tailed, left-tailed, or right-tailed? Two-tailed test Right tailed test O Left-tailed test b. What is the test statistic? The test statistic is (Round to two decimal places as needed.)

Explanation / Answer

Since here z test is applicable, therefore z statistic will be used where

z= (observed p- true p) /(square root(true p*(1-truep)/n))

Here observed z value is 2.90, therefore the value of test statistic is 2.90

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