Quiz Scores Narrative
Two independent random samples of sizes 
= 4 and 
= 5 are selected from two normal populations. The data below represent the scores in a 20-point quiz. 
-Refer to Quiz Scores Narrative. Find a 90% confidence interval for ( 
), the difference between the two population means.
Definitions:
Digital Option
A financial instrument that provides a fixed return if the market price is above (for a call) or below (for a put) a certain level at expiration.
Bull Money Spread
A type of options strategy that is used when an investor expects a moderate rise in the price of the underlying asset.
Calls
Calls are options contracts giving the holder the right, but not the obligation, to buy a specified amount of an underlying security at a predetermined price within a specified time frame.
Option Quotes
Information about the price of an option contract, including its bid and ask prices, and sometimes the volume and open interest.
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