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In Constructing a Confidence Interval For σ\sigma Or σ2\sigma ^ { 2 }

question 46

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In constructing a confidence interval for σ\sigma or σ2\sigma ^ { 2 } , a table is used to find the critical values χL2 and χR2\chi _ { \mathrm { L } } ^ { 2 } \text { and } \chi _ { \mathrm { R } } ^ { 2 } for values of n101n \leq 101 For larger values of n, χL2 and χR2\chi _ { \mathrm { L } } ^ { 2 } \text { and } \chi _ { \mathrm { R } } ^ { 2 } can be
approximated by using the following formula: χ2=12±zα/2+2k12\chi ^ { 2 } = \frac { 1 } { 2 } \pm z _ { \alpha / 2 } + \sqrt { 2 k - 1 } ^ { 2 } where k is the number of degrees of freedom and zα/2z _ { \alpha / 2 } is the critical z-score. Construct the 90 % confidence interval for σ\sigma using the following sample data: a sample of size n=232 yields a mean weight of 154 lb and a standard deviation of 25.5 lb. Round the confidence interval limits to the nearest hundredth.


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Marginal Analysis

An economic approach that involves comparing the additional benefits of an activity to its additional costs.

Marginal Analysis

Marginal analysis is the examination of the benefits and costs of an incremental change in the production or consumption of goods or services.

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A promotional tool in the form of a voucher that offers a discount or rebate on the purchase of a product or service.

Marginal Analysis

Marginal Analysis is an assessment method used to evaluate the impact of a small change in production levels or economic activity, focusing on the cost and benefit of making that change.

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