Author: Anonymous

X is normally distributed with μ = 200 and σ = 20. Find P(X > 218.0).

A random sample has x̄ = 105, s = 15, and n = 20. The population standard deviation is unknown. Find the 90% confidence interval for μ.

In a random sample of n = 200, x = 130 subjects have the characteristic of interest. Find the 95% confidence interval for the population proportion p.

In a random sample of n = 90, x = 45 subjects have the characteristic of interest. Find the 95% confidence interval for the population proportion p.

A population has standard deviation σ = 20. For samples of size n = 100, find the standard deviation of the sampling distribution of x̄.

A population has μ = 80 and σ = 12. A random sample of n = 36 is selected. Find P(x̄ < 84).

For a population with μ = 75, σ = 12, and samples of size n = 36, identify the mean and standard deviation of the sampling distribution of x̄.

A population has μ = 50 and σ = 9. A random sample of n = 36 is selected. Find P(x̄ > 52).

The population proportion is p = 0.30. For a random sample of n = 200, find P(p̂ < 0.34).

For a population with μ = 100, σ = 20, and samples of size n = 100, identify the mean and standard deviation of the sampling distribution of x̄.