State Gasoline Taxes Arandom sample of state gasoline

Chapter 7, Problem 8

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QUESTION:

State Gasoline Taxes Arandom sample of state gasoline taxes (in cents) is shown here for 12 states. Use the data to estimate the true population mean gasoline tax with 90% confidence. Does your interval contain the national average of 44.7 cents? 38.70_m_48.28. Assume normal distribution; yes. 38.4 40.9 67 32.5 51.5 43.4 38 43.4 50.7 35.4 39.3 41.4 Source: http://www.api.org/statistics/fueltaxes/

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QUESTION:

State Gasoline Taxes Arandom sample of state gasoline taxes (in cents) is shown here for 12 states. Use the data to estimate the true population mean gasoline tax with 90% confidence. Does your interval contain the national average of 44.7 cents? 38.70_m_48.28. Assume normal distribution; yes. 38.4 40.9 67 32.5 51.5 43.4 38 43.4 50.7 35.4 39.3 41.4 Source: http://www.api.org/statistics/fueltaxes/

ANSWER:

Step 1 of 3

Given:

The mean is the sum of all values divided by the number of values:

 is the number of values in the data set.

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