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Find the width of the 95% confidence interval for mean.
For a sample of 138 independent observations from a normal distribution of unknown μ and variance σ2 = 2.6, the sample mean is 52.3. What is the width of the 95% confidence interval for μ?
(1) 0.269
(2) 0.538
(3) 6.3208
(4) 0.0116
(5) 0.0233
Using the .10 level of significance, can we conclude that the assembly time using the new method is faster?
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How large sample size must be taken to be 95% confident.
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Describe the independent variable and the dependent variables?
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