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The time to failure in hours of an electronic component subjected to an accelerated life test is shown in the following table. To accelerate the failure test, the units were tested at an elevated temperature (read down, then across).
Electronic
Component
Failure
Time
127
124
121
118
125
123
136
131
120
140
119
137
133
129
128
141
142
151
160
130
122
126
Suppose you want to test whether the failure time is equal to 135. Given the significance level set at 5%, do the following to conduct a t-test.
(a) Set up the null and alternative hypothesis (two-tailed).
(b) Calculate the test statistic.
(c) Compare the test statistic to a critical value at the 5% significance level and determine if the null hypothesis should be rejected.
(d) Discuss your results using non-technical language.
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