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# Statistical Reasoning for everyday life - PowerPoint PPT Presentation

Statistical Reasoning for everyday life. Intro to Probability and Statistics Mr. Spering – Room 113. 2.4 Index Numbers. Inflation – an increase in credit relative to available goods resulting in substantial and continual rise in prices.

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### Statistical Reasoningfor everyday life

Intro to Probability and Statistics

Mr. Spering – Room 113

• Inflation – an increase in credit relative to available goods resulting in substantial and continual rise in prices.

• Index Number – simple way to compare measurements made at different times or in different places. The value at one particular time (or place) must be chosen as the reference value (or base value). The index number for any other time (or place) is:

index number =

--Everything in this journey of life depends on your reference point.--

• Example:

COMPARING GASOLINE PRICES ( PER GALLON)

• CONSUMER PRICE INDEX (CPI) – computed and reported monthly, represents an average of prices in a sample of more than 60,000 goods, services, and housing costs

http://www.bls.gov/cpi/

http://data.bls.gov/cgi-bin/surveymost?cu

GOOD LUCK!!!!

Suppose the cost of gasoline today is \$ 2.60 per gallon. What is the price index number for gasoline today, with 1975 price (\$ 0.567) as the reference value?

Suppose that it cost \$10 to fill your gas tank in 1975. How much will it cost now?

Suppose it would have cost you \$15 to fill your gas tank in 1985 (index # 210.9). How much will it cost you now?

The average cost of tuition, fees, and room and board at a four-year public universities rose from \$2,490 in 1980 to \$7,800 in 1997. Calculate the percentage rise in cost from 1980 to 1997, and compare it to the overall rate of inflation as measured by the CPI.

***Therefore, the tuition rate increased more than twice as much as the inflation rate for the same time period.

• Remember:

----Failing to prepare is preparing to fail----

---GIVING your best EFFORT based on the KNOWLEDGE you have attained is not GOOD enough if the amount of KNOWLEDGE you possess reflects a LACK of effort to LEARN--- Lawrence W. Schott

HW:

pg 80 #1-19 odd