An experiment was performed to determine which brand of comparably priced light bulbs, A or B, lasts longer on average. Ten bulbs of each brand were tested, and their lifetimes recorded in hours. The data are shown below: 
(a) Display these data using a comparative (back-to-back) stemplot. (b) What are the differences and similarities in the lifetime distributions for the two samples? (c) If your preference for brand A or B must be determined from the information in parts (a) and (b), which brand would you buy? Explain your choice using appropriate statistical terminology.
Definitions:
Performance Scores
Quantitative measures used to evaluate the effectiveness or achievement level of an individual in a specific task or assessment.
Null Hypothesis
Alternative to a primary hypothesis, stating that there is no relationship between the independent variable and the dependent variable.
Scientific Method
Systematic method of obtaining and evaluating information relevant to a problem.
Variable
Measurable factor or characteristic that can vary within an individual, between individuals, or both.
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