In a test of the effectiveness of garlic for lowering cholesterol, 50 subjects w

Question

In a test of the effectiveness of garlic for lowering cholesterol, 50 subjects were treated with garlic in a processed tablet form Cholesterol levels were measured before and after the treatment The changes in their levels of LDL cholesterol (in mg/dL) have a mean of 5.2 and a standard deviation of 16.7. Complete parts (a) and (b) below. What is the best point estimate of the population mean net change in LDL cholesterol after the garlic treatment? The best point estimate is mg/dL. (Type an integer or a decimal.)

Explanation / Answer

the point estimate of population mean is sample mean = 5.2 mg/dl

any statistic can be a point estimate. A statistic is an estimator of some parameter in a population. For example:

In statistics, point estimation involves the use of sample data to calculate a single value (known as a statistic) which is to serve as a "best guess" or "best estimate" of an unknown (fixed or random) population parameter.

More formally, it is the application of a point estimator to the data.

In general, point estimation should be contrasted with interval estimation: such interval estimates are typically either confidence intervals in the case of frequentist inference, or credible intervals in the case of Bayesian inference

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