An experiment compares the life span of two brands of light bulbs. Twelve bulbs of each type were tested until failure. The results are shown for the two types of light bulbs in hours. Find the mean time of each light bulb. Compare the means of each population.

Bulb A: HotLight

Time, in hours

1 comma 445

1 comma 095

1 comma 143

933

1 comma 509

1 comma 510

1 comma 241

1 comma 381

1 comma 022

1 comma 340

1 comma 023

1 comma 041

Bulb B: BrightBulb

Time, in hours

1 comma 107

1 comma 089

1 comma 399

1 comma 453

1 comma 482

1 comma 499

928

1 comma 406

1 comma 527

989