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Political scientists want to estimate the proportion of republicans and democrats in each of the 50 states. They take a random sample of 500 individuals from each state. What sampling did they use? Cluster, Stratified, Simple random, or Convenience?
1. in 2005 the average gpa for students was 3.15. a sample in 2008 showed that the average gpa for students was 3.46.
A personnel manager has a computer-generated list of all employees that indicates that 70 percent are full-time employees, 20 percent are part-time employees, and 10 percent are furloughed or laid-off employees.
An accountant wants to estimate the average amount of an account of a ser- vice company. A random sample of 46 accounts yields x = $16.50 and s = $2.20. Give a 95% con?dence interval for the average amount of an account.
Suppose the waiting time at a restaurant is normally distributed with a mean of 12 minutes and a standard deviation of 6 minutes.
What do high and low values of kurtosis imply for the shape of a frequency distribution? Draw a diagram to illustrate your answer.
Scores by women on the SAT-I test are normally distributed with a mean score of 998 and a standard deviation of 202. scores by women on the ACT test are normally distributed with a mean of 20.9 and a standard deviation of 4.6 assume the two tests ..
the computer-science aptitude score x and the achievement score y measured by a comprehensive final were measured for
using the standard normal table find the proportions for the areas listed belowa. the area between z 0 and z 2.13b.
what is the probability that on 10 true of false questions 4 will be correct and 6 incorrect out of plain
q1. mimi was the 5th seed in 2012 umuc tennis open that took place in august. in this tournament she won 83 of her 100
Calculate the mean, median and mode for both sets and do graph/histogram to chart the results and conclude if indeed one set of year had more the other as far a snowfall.
Compute the mean, variance, and standard deviation of the overseas bond yields as of March 6, 2009.
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