Question: Exercise 5-15 Algo Suppose that one in six smartphone users have fallen prey to cyber-attack. We use a sample of 157 smartphone users. a-1. What

Exercise 5-15 Algo Suppose that one in six smartphone users have fallen prey to cyber-attack. We use a sample of 157 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 1-2. Is it appropriate to use the normal distribution approximation for the sample proportion? Yes, because np a 5 and off-p25 Yes, because na 30 No, because np 25 and 1-25 No, because n

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