You Wish to Construct a 90% Confidence Interval to Compare

question 41

Multiple Choice

You wish to construct a 90% confidence interval to compare the mean measurement for two groups.A small pilot study yields sample standard deviations of 20 and 30 for Group 1 and Group 2,respectively.If we wish to obtain a margin of error of at most 5,what sample size should we take from each group? Assume equal sample sizes.

• A)141
• B)139
• C)143
• D)140
• E)142

Understand the relationship between contraception use and prevention of unintended pregnancies.

Be aware of the considerations necessary for the safe use of barrier methods.

Acknowledge the implications and outcomes of unprotected sex.

Understand the concept and impacts of self-enhancement and self-insight.

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Definitions:

Problem-Solving Skills

The ability to find solutions to difficult or complex issues.

Experiment

A research method in which an investigator manipulates one or more factors (independent variables) to observe the effect on some behavior or mental process (the dependent variable). By random assignment of participants, the experimenter aims to control other relevant factors.

Experimentation

The process of conducting tests and trials to explore hypotheses, gather data, or demonstrate principles in controlled conditions.

Mental Process

Operations of the mind involving thinking, perceiving, remembering, and understanding, often influencing behavior.