Suppose that one in six smartphone users have fallen prey to cyber-attack. We use a sample of 190 smartphone users. a-1. What is the expected value and the standard error of the sample proportion? (Round "Expected value" to 2 decimal places and "Standard error" to 4 decimal places.) Expected value Standard error a-2. Is it appropriate to use the normal distribution approximation for the sample proportion? O Yes, because np 2 5 and n(1 - p) 2 5 O Yes, because n 2 30 O No, because np 2 5 and n(1 - p) 2 5 O No, because n<30 b. What is the probability that more than 19% of smartphone users in the sample have fallen prey to cyber-attack? (Round final answer to 2 decimal places.) Probability
Suppose that one in six smartphone users have fallen prey to cyber-attack. We use a sample of 190 smartphone users. a-1. What is the expected value and the standard error of the sample proportion? (Round "Expected value" to 2 decimal places and "Standard error" to 4 decimal places.) Expected value Standard error a-2. Is it appropriate to use the normal distribution approximation for the sample proportion? O Yes, because np 2 5 and n(1 - p) 2 5 O Yes, because n 2 30 O No, because np 2 5 and n(1 - p) 2 5 O No, because n<30 b. What is the probability that more than 19% of smartphone users in the sample have fallen prey to cyber-attack? (Round final answer to 2 decimal places.) Probability
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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