The 90% Confidence Interval Estimate for a Population Standard Deviation

question 67

Multiple Choice

The 90% confidence interval estimate for a population standard deviation when a sample variance of 50 is obtained from a sample of 15 items is

• A)4.18 to 15.07
• B)5.18 to 11.15
• C)5.44 to 10.32
• D)29.55 to 106.53

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Definitions:

Precipitation Reaction

A precipitation reaction is a chemical reaction in which soluble ions in separate solutions react to form an insoluble compound that settles out of solution as a solid precipitate.

Limiting Reactant

The limiting reactant is the substance in a chemical reaction that is completely consumed first, thereby determining the maximum amount of product that can be formed.

Wax

A diverse class of organic compounds that are malleable at slightly higher temperatures than room temperature and mainly consist of hydrocarbons.

Theoretical Yield

The maximum amount of product that could be formed from given amounts of reactants in a chemical reaction, assuming no losses.