Imagine that we took a large sample of respondents and measured their education. The sample mean = $35,000 and the sample standard variation = $5000 : using that information, what percentage of people have fewer than 19.5 years of education. Show work.
Imagine that we took a large sample of respondents and measured their education. The sample mean...
Imagine that we took a large sample of respondents and measured their education. The sample mean =16 years and the sample standard variation = 1.5 : using that information, what percentage of people have more than 20 years of education. Show work.
Imagine that we took a large sample of respondents and measured their education. The sample mean =16 years and the sample standard variation = 1.5 : using that information,what is the 40th percentile of education. Show work.
We have measured the lifetime (in days) of 55 expensive lamps, which led to a sample mean and a standard deviation of 460 and 23, respectively. We have also measured the lifetime of 55 cheap lamps, which led to a sample mean and a standard deviation of 400 and 15, respectively. Carry out a test of hypotheses at significance level of 0.01 to decide whether the true mean of of the lifetime of the cheap lamps is less than 50...
Education influences attitude and lifestyle. Differences in education are a big factor in the "generation gap." Is the younger generation really better educated? Large surveys of people age 65 and older were taken in n - 37 U.S. cities. The sample mean for these cities showed that xı -15.2% of the older adults had attended college. Large surveys of young adults (age 25 - 34) were taken in 12 - 33 U.S. cities. The sample mean for these cities showed...
Education influences attitude and lifestyle. Differences in education are a big factor in the generation gap." Is the younger generation really better educated? Large surveys of people age 65 and older were taken in ny - 39 U.S. cities. The sample mean for these cities showed that X1 - 15.2% of the older adults had attended college. Large surveys of young adults (age 25 - 34) were taken in n2-30 U.S. cities. The sample mean for these cities showed that...
Education influences attitude and lifestyle. Differences in education are a big factor in the generation gap." is the younger generation really better educated? Large surveys of people age 65 and older were taken in n - 34 U.S. cities. The sample mean for these cities showed that #1 - 15.2% of the older adults had attended college. Large surveys of young adults (age 25 34) were taken in ny = 32 U.S. cities. The sample mean for these cities showed...
Large Sample Proportion Problem. Surveys were conducted in multiple countries and respondents were asked if they felt political news was reported fairly. The data for the United States is that out of 1,000 sampled, 470 indicated yes, they felt political news was reported fairly. Suppose we want to construct a 95% confidence interval. What is the standard error for the confidence interval? A. .5/SQRT(1,000) B. SQRT((.5*.5)/1000) C. SQRT((.47*.53)/1000) D. Cannot be determined from the information given.
Twenty-five packages of a dozen extra-large eggs were randomly selected and their weights measured. The mean was 783.4 grams with a standard deviation of 12.1. Estimate the true standard deviation of the weight of the package of a dozen extra-large eggs using a 95% confidence interval. Assume that the distribution of the weight is approximately normal. Show your full work.
People in a large city have heights that are normally distributed with a mean of 73.5 inches and a standard deviation of 3.98 inches. Suppose we obtain random samples of 60 people and find the mean height of people in the samples. One sample of 60 people has a mean height of 74 inches. What is the Z-score of this sample mean? Round the value to two decimal places.
Please show how to solve using excel. At a large university, the mean age of the students is 22.3 years, and the standard deviation is 4 years. A random sample of 64 students is drawn. What is the probability that the average age of these students is greater than 23 years? In another large university, 25% of the students are over 21 years of age. In a sample of 400 students, what is the probability that more than 110 of...