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krok68 [10]
2 years ago
13

Medicare Hospital Insurance The average yearly Medicare Hospital Insurance benefit per person was $4064 in a recent year. Suppos

e the benefits are normally distributed with a standard deviation of $460. Assume that the sample is taken from a large population and the correction factor can be ignored. Use a TI-83 Plus/TI-84 Plus calculator. Round your answer to at least four decimal places.
Find the probability that the mean benefit for a random sample of 20 patients is more than $4100.
P (X > 4100) =?
Mathematics
1 answer:
Delvig [45]2 years ago
7 0

Answer:

0.3632 = 36.32% probability that the mean benefit for a random sample of 20 patients is more than $4100.

Step-by-step explanation:

To solve this question, we need to understand the normal probability distribution and the central limit theorem.

Normal probability distribution

When the distribution is normal, we use the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

In this question, we have that:

Population: \mu = 4064, \sigma = 460

Sample of 20: n = 20, s = \frac{460}{\sqrt{20}} = 102.86

Find the probability that the mean benefit for a random sample of 20 patients is more than $4100.

This is 1 subtracted by the pvalue of Z when X = 4100. So

Z = \frac{X - \mu}{\sigma}

By the Central Limit Theorem

Z = \frac{X - \mu}{s}

Z = \frac{4100 - 4064}{102.86}

Z = 0.35

Z = 0.35 has a pvalue of 0.6368

1 - 0.6368 = 0.3632

0.3632 = 36.32% probability that the mean benefit for a random sample of 20 patients is more than $4100.

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