Suppose that one in six smartphone users have fallen prey to cyber-attack. We use a sample of 210 smartphone users.a-1. What is the expected value and the standard error of the sample proportion?Note: Round final answers to 4 decimal places.Expected valueStandard errora-2. Is it appropriate to use the normal distribution approximation for the sample proportion?Yes, because np ≥ 5 and n(1 - p) ≥ 5Yes, because n ≥ 30No, because np ≥ 5 and n(1 - p) ≥ 5○ No, because n < 30b. What is the probability that more than 20% of smartphone users in the sample have fallen prey to cyber-attack?Note: Round final answers to 4 decimal places.Probability

Part a-1) : Expected value = 0.17 Standard error = 0.0259 Part a: Yes, because np ≥ 5 and n(1-p) ≥ 5…

Answered: Suppose that one in six smartphone…

FINANCIAL ACCOUNTING

10th Edition

ISBN:9781259964947

Author:Libby

Publisher:Libby

Chapter1: Financial Statements And Business Decisions

Section: Chapter Questions

Problem 1Q

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