Confidence interval within the context of the problem

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Reference no: EM132868984

SmithCo is a supplier to many brand-name makers of mobile phones. SmithCo manufactures the external shells that enclose mobile phones. The strength of a shell is measured by applying increasing pressure to the shell and recording the pressure at which the shell breaks. Shell strengths are approximately normally distributed. A random sample of 100 shells made by SmithCo showed an average strength of 45.0 pounds and a (sample) standard deviation of 20.0 pounds. By hand calculations (use only Excel, do not use StatTools), construct a 90% con?dence interval for the mean shell strength.

1. Provide the value of the 2 multiple with the Excel formula.

2. State the con?dence interval in the form point estimate 1 margin of error.

3. Interpret the confidence interval within the context of the problem.

Reference no: EM132868984

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