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A savings and loan association needs information concerning the checking account balances of it's local customers.
A random check of 81 records of inmates from all federal prisons found the confidence interval for mean prison terms per prisoner to be 2.113 years
A financial analyst, known for her excellent track record, has decided to part company with her old partners and to enter the venture capital area.
In an election campaign, the party vying for an upset polls a sample of 100 voters. The party finds that 60 of 100 clearly express the intention of voting
After a certain candidate announced his intention for running for the premiership of a province, many polls were conducted to assess his chanced for success.
What is the 95% one-sided confidence interval for the average worker?
Given the following information, calculate a confidence interval using a 95 percent confidence level: sample proportion =.4, standard error of the proportion
A local merchant is interested in obtaining a small business loan to expand his business. He will be able to obtain a more favorable interest rate
A cutoff score of 79 has been established for a sample of scores in which the mean is 65. If the corresponding z-score is 1.4 and the scores
Recruit 25 volunteers who have received a medication and find they have a mean concentration of 7 with a standard deviation of 2. Assume normally distributed.
Let (X1, X2,..., Xn) be a sample, where each Xi is a random variable of normal distribution with mean µ and variance s²
An office manager wishes to estimate the mean time required to handle customer complaints. A sample of 38 complaints shows a mean time of 28.7 minutes
Infants weighing more that 1700 grams who require respiratory assistance within the first 24 hours of birth and met other clinical criteria.
A citizen's group is interested in the portion of the population that opposes the expansion at O'Hare airport. In a survey of 1,440 randomly selected people
A study of 64 convicted felons was conducted regarding the age of the first offense. The mean age of first offense was 13.2 years with a s.d. of 4.6 years.
How do I create interval estimate for the difference between the average fees of the 2 restaurants at a confidence co-effiecent at 95%
It is desired to estimate which of the two soft drinks, Coke or Pepsi, UCLA students prefer. A random sample of 167 UCLA students produced the following
The owner of Britten's Egg Farm wants to estimate the mean number of eggs laid per chicken. A sample of 20 chickens shows they laid an average of 20 eggs
Assume that the population proportions are to be estimated from the samples described. Find the margin of error and the 95% confidence interval.
Give an estimate of the sample size needed to obtain the specified margin of error for a 95% confidence interval.
The distribution of sample mean for samples of 500 homes is normal with a mean of 2.64 and a standard deviation of 0.06.
For air travelers, one of the biggest complaints is of the waiting time between when the airplane taxis away from the terminal until the flight takes off
In the spring of 2002, residents of the United States were quite worried about the possibility of further terrorists attacks.
Does the M&M/Mars Corporation use the same proportion of red candies in its plain and peanut varieties? A random sample of 56 plains M&Ms contained 12 red
In an attempt to compare the starting salaries of college graduates majoring in education and social sciences, random samples of 50 recent college graduates