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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
A poll of 1400 randomly selected students in grades 6 through 8 was conducted and found that 30% enjoy playing sports.
A parcel service randomly selected 48 packages it received. The sample has a mean weight of 18.6 pounds. Assume that s= 3.4 pounds
The data studies the effect of dietary calcium on blood pressure. In the experiment, one group of black male adults received calcium supplements for 12 weeks
The mean and standard deviation of the sample of 65 customer satisfaction ratings are x-bar = 42.95 and s = 2.6424
Vito has completed the analysis of some sample data from a recent survey of local high school students. He has determined that his sample has attended
Having been retained by the National Native American Political Party to conduct a poll of residents of Muscogee, Oklahoma, you have worked diligently
Decoders often use the fact that the letter "e" appears in written work more than any other letter.
To estimate the mean size of maple trees in a certain area of the Adirondacks. A sample of 15 maple tree heights is collected (refer to the data set)
Find a 90% confidence interval for the mean number of tongue flicks per 20 minutes for all juvenile common lizards. Assume a population standard deviation
A variable of a population has a mean of m = 35 and a standard deviation of o = 42.
Arthur D. Little, Inc. estimates that approximately 70% of mail received by a household is advertisements (Time, July 14, 1997)
A major department store chain is interested in estimating the average amount its credit card customers spent on their first visit tothe chain's new store
Construct a confidence interval for, the mean of the differences d for the population of paired data. Assume that the population of paired differences is normal
A manufacturer of small appliances employs a market research firm to estimate retail sales of its products by gathering information from a sample of retail