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# Year Quarter Starts front 274 front 2 374 front 3 341 front A GRE LULL 293 LULL 2 386 LULL 3 361 LULL A 319 202 304 on 406 on 3 ALL on A 7 7 2004 345...

**Quarterly single-family housing starts**

The quarterly numbers of single-family housing starts (in thousands of dwellings) in the United States from 2001 through 2005 are recorded in the table (some of the data is shown).

**a. **Using Quarter 1, 2001, as a base period, calculate the simple index for this quarterly time series.

**b. **Interpret the simple index for Quarter 2, 2004.

**c. ** By what percentage did the number of housing starts increase between Quarter 1, 2001, and Quarter 4, 2005?

**d. **By what percentage did the number of housing starts increase between Quarter 1, 2003, and Quarter 4,2005?