Mop and Broom Manufacturing has tracked the number of units sold of its most popular mop over the past 24 months, as shown.

Month Sales Month Sales Month Sales 1 239 9 310 17 369 2 248 10 335 18 378 3 256 11 348 19 367 4 260 12 353 20 383 5 271 13 355 21 394 6 280 14 368 22 393 7 295 15 379 23 405 8 305 16 358 24 412

a. Develop a linear trend line for the data.

b. Compute a correlation coefficient for the data and evaluate the strength of the linear relationship.

c. Using the linear trend line equation, develop a forecast for the next period, month 25.