A population of proportions has a distribution with p = random sample of size n = 38. 0.61 and o = 0.488. You intend to draw a According to the Central Limit Theorem: What is the mean of the distribution of sample means? p = What is the standard deviation of the distribution of sample means? (Report answer accurate to 3 decimal places.)

A given distribution has a population mean, μ, of 144 and a population standard deviation, σ, of 12.  What z-score would be associated with the value x = 127?

f the standard deviation of a normally distributed population is 22.0 and we take a sample of size 4, then the standard error of the mean is

In a population of a certain species of newt, the mean length of the newts is μ= 63 inches and the standard deviation is σ= 3.4 inches. You collect a random sample of n=16 newts. The bell curve below represents the distribution of these sample means. The scale on the horizontal axis is the standard error of the sampling distribution. Complete the indicated boxes, correct to two decimal places. mean of distribution= standard error=       Note: The left box is 2 standard errors below the mean. The middle box is the mean. The right box is 2 standard errors above the mean.

Consider a normal distribution curve where 55-th percentile is at 11 and the 20-th percentile is at 8. Use this information to find the mean, u , and the standard deviation, o , of the distribution. a ) μ - b) σ-

Consider a normal distribution curve where 70-th percentile is at 18 and the 35-th percentile is at 1. Use this information to find the mean, μ, and the standard deviation, o, of the distribution. a) b) o=

The temperature distribution of city D has a population mean µ= 21.3, and standard deviation o = 4.8. You randomly select 12 days and get the temperature for these days. Then you compute the sample mean. What is the maximum sample mean value in the bottom 0.22 x 100% of the sample mean distribution? Note that we're talking about the distribution of the sampling mean. Give your answer to 2 decimal places.

Assume all populations are normally distributed. A travel analyst claims that the mean price of a round trip flight from New York City to Los Angeles is less than $507. In a random sample of 55 round trip flights from NYC to LA, the mean price is $502. Assume the population standard deviation is $111. At α = 0.05, is there enough evidence to support the travel analyst’s claim?

The t distribution should be used whenever: Select one: A. the population is not normally distributed. B. the sample standard deviation is used to estimate the population standard deviation. C. None of the answers are correct. D. the sample size is less than 30.