Question
On its municipal website, the city of Tulsa states that the rate it charges per 5 CCF of residential water is $21.62. How do the
On its municipal website, the city of Tulsa states that the rate it charges per 5 CCF of residential water is $21.62. How do the residential water rates of other U.S. public utilities compare to Tulsa's rate? The datasetcontains the rate per 5 CCF of residential water for 42 randomly selected U.S. cities.
Formulate hypotheses, at = 0.05, that can be used to determine whether the population mean rate per 5 CCF of residential water charged by U.S. public utilities differs from the $21.62 rate charged by Tulsa.
Public Utility Company | Rate (5 CCF) |
Orlando Utilities Commission | $10.48 |
Memphis Light, Gas and Water | $9.18 |
Central Arkansas Water | $11.80 |
City of Phoenix Water System | $6.50 |
City of Lincoln Water System | $12.42 |
San Antonio Water System | $14.53 |
Salt Lake City Public Utilities | $15.56 |
Nashville Metro Water Services | $10.12 |
City of Dover Water System | $14.50 |
Lakeland Electric | $16.18 |
Huntsville Utilities | $17.60 |
Omaha Metropolitan Utilities District | $19.18 |
Jacksonville Electric Authority | $17.98 |
City of Dallas Water System | $12.85 |
City of St. Louis Water System | $16.80 |
Charleston Water System | $17.35 |
City of Clewiston Water System | $15.64 |
Springfield (IL) City Water, Light and Power | $14.80 |
City Of Milwaukee Water System | $18.91 |
Detroit Sewerage and Water Department | $17.99 |
City of Charlotte Water System | $14.90 |
Louisville Water Company | $18.42 |
City of Jackson (MS) Water System | $16.05 |
Las Vegas Valley Water District | $26.85 |
City of Columbus OH Water System | $22.32 |
City of Oklahoma City - Utilities | $22.76 |
Jackson TN Energy Authority | $20.98 |
Knoxville Utilities Board | $23.45 |
New York City Water Board | $19.05 |
Reno Truckee Meadows Water Authority | $23.70 |
Chattanooga American Water Company | $19.26 |
Marietta Board of Lights & Water | $23.75 |
City Utilities of Springfield MO | $27.80 |
Indianapolis Citizens Energy Group | $27.05 |
City of Philadelphia Water System | $27.14 |
LA Sewerage and Water Board of New Orleans | $26.99 |
Boston Water and Sewer Commission | $24.68 |
Birmingham Water Works | $37.86 |
Austin Water | $26.51 |
City of Bellevue Water System | $39.01 |
City of Los Angeles Water System | $29.46 |
Peoria American Water | $41.65 |
1. State the null and alternative hypotheses.
Ho:
Ha:
Hypothesised mean
2. Is this a right-tailed, left-tailed or two-tailed hypothesis test?
3. Compute the following statistics
n | |
mean | |
std dev | |
std error | |
test t | |
critical t | |
df | |
alpha | 0.05 |
p-value |
4. Do you reject or fail to reject the null hypothesis? Tell me how you know.
5. State your conclusion in the context of the problem
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