A Study Determined That in 2009, 38% of Those in a Random

question 14

Multiple Choice

A study determined that in 2009, 38% of those in a random sample of 100 adult Americans had accounts with some type of social web site. In a similar survey conducted in 2012, 53% reported having accounts. Suppose that the 2012 figure was also based on a random sample of size 100. The 95% confidence interval for the difference in population proportions, P₂₀₁₂-P₂₀₀₉ , is: ​

• A)0.15 ± 0.088
• B)0.29 ± 0.136
• C)0.15 ± 0.136
• D)0.29 ± 0.88
• E)0.00 ± 0.136

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Definitions:

Lost Sale

A situation in which a potential sale is not realized, often due to stock unavailability, pricing issues, or the customer's decision to purchase from a competitor.

Order Policy

Guidelines or rules defining how and when inventory orders should be placed to maintain optimal stock levels and minimize costs.

Random Numbers

Numbers generated in a sequence where each number has an unpredictable outcome, widely used in statistics, simulations, and cryptography.

Random Number Intervals

A range within which a random number falls, used in simulations and probabilistic models to represent uncertainty or variability.