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:

Counteroffer

An offer made in response to another offer, rejecting the original offer and presenting new terms for an agreement.

Option

A separate contract in which an offeror agrees not to revoke her offer for a stated period of time in exchange for some valuable consideration.

Reasonable Time

A period that is fair and appropriate given the circumstances, often used in contracts to define a period for the performance of an obligation.

Subjective Approach

A perspective or method that relies on personal opinions, interpretations, feelings, or tastes, rather than objective or external facts.