Use the Following Information to Answer Questions (11)-(13)

question 47

Multiple Choice

Use the following information to answer questions (11) -(13) . According to the website www.costofwedding.com,
the average cost of flowers for a wedding is $698. Recently, in a random sample of 40 weddings in the U. S. it
was found that the average cost of the flowers was $734, with a standard deviation of $102. On the basis of this, a
95% confidence interval for the mean cost of flowers for a wedding is $701 to $767.
-Which of the following statements is true about the t-distribution?

• A)For small sample sizes, the t-distribution has the same properties of the normal curve.
• B)For large sample sizes, the t-distribution has the same properties of the normal curve.
• C)Like the Normal distribution, the t-distribution is symmetric for small n.
• D)Since population standard deviation is usually unknown, the standard error uses the sample standard deviation to estimate population standard deviation.

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Definitions:

Reinforcers

Stimuli, events, or conditions that increase the likelihood of a behavior being repeated.

Self-Modification Program

A self-directed plan designed to change one's behavior or habits through a structured process of self-observation, goal-setting, and reinforcement.

Positive Reinforcement

In behaviorism, a process by which the likelihood of a specific behavior is increased through the use of a reward following the desired behavior.

Empirical

Empirical refers to information acquired by observation or experimentation, basing knowledge on empirical evidence is foundational in science.