Question

Three brands of batteries are under study. It is s suspected that the lives (in weeks) of the three brands are different. Five randomly selected batteries of each brand are tested with the following results: Weeks of Life Brand 1 Brand 2 Brand 3 100 76 108 96 80 100 92 75 96 96 84 98 92 82 100 (a) Are the lives of these brands of batteries different? ? Use a = 0.05. (b) Analyze the residuals from this experiment. (c) Construct a 95 percent interval estimate on the mean life of battery brand 2. (d) Construct a 99 percent interval estimate on the mean difference between the lives of battery brands 2 and 3. (d) Which brand would you select for use? (e) If the manufacturer will replace without charge any battery that fails in less than 85 weeks, what percentage would the company expect to replace?

          Three brands of batteries are under study. It is s suspected
that the lives (in weeks) of the three brands are different. Five
randomly selected batteries of each brand are tested with the
following results:
Weeks of Life
Brand 1
Brand 2
Brand 3
100
76
108
96
80
100
92
75
96
96
84
98
92
82
100
(a)     Are the lives of these brands of
batteries different? ? Use a = 0.05.
(b)     Analyze the residuals from this
experiment.
(c)     Construct a 95 percent interval
estimate on the mean life of battery brand 2.
(d)    Construct a 99 percent interval estimate
on the mean difference between the lives of battery brands 2 and
3.
(d)     Which brand would you select for
use?
(e)     If the manufacturer will replace
without charge any battery that fails in less than 85 weeks, what
percentage would the company expect to replace?

Added by Carol I.

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