Question
Suppose that one in six smartphone users have fallen prey to cyber-attack. We use a sample of 235 smartphone users. 1. What is the expected
Suppose that one in six smartphone users have fallen prey to cyber-attack. We use a sample of 235 smartphone users.
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:
2A. Is it appropriate to use the normal distribution approximation for the sample proportion?
a. Yes, because np 5 and n(1 - p) 5
b.Yes, because n 30
c.No, because np 5 and n(1 - p) 5
d. No, because n < 30
2B.What is the probability that more than 20% of smartphone users in the sample have fallen prey to cyber-attack? (Round final answer to 2 decimal places.
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