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Packages of sugar bags for Sweeter Sugar Inc. have an average weight of 16 ounces and a standard deviation of 0.24 ounces.
A study of injuries to in line skaters used data from the National Electronic Injury Surveillance System, which collects data from a random sample
A random sample of 10 parking meters in downtown Nashville showed the following incomes for a day.
Plain type fonts such as Times New Roman are easier to read than fancy fonts such as Gigi. A group of 25 volunteer subjects read the same text in both fonts.
An automobile manufacturer would like to know what proportion of its customers are not satisfied with the service provided by the local dealer.
Freshman 15 Weight gains. Based on the sample results, find the best point estimate of the percentage of college students who gain weight in their freshman
A random sample of 50 engineers of a large technology company that the sample mean is 34.4 year. Assume that the population standard deviation is 8 years
M&M Candies Use the following data of the weight in grams of M&M plain candies. Assume the population is normally distributed.
In a study of the income of U.S factory workers, a random sample of 125 workers shows a sample mean of $29,000
12 mature citrus trees of one variety and 15 of another gave means and standard deviations of their heights as 13.8 and 12.9 ft (means), and 1.2 and 1.5 ft
Of 300 people waiting lunch at a department store cafeteria, 102 had dessert. What is the confidence associated with a Rao score interval of length .1
Children's scores on a measure of aggression are known to have a normal distribution, with a mean of 50 and a standard deviation of 6.
The figure below shows the probability histogram for the total number of spots when a die is rolled eight times. The shaded area represents the chance
To aid in planning the development of a tourist shopping area, a state agency wants to estimate the average dollar amount spent by a tourist in an existing shop
In an effort to estimate the mean amount spent per customer for dinner at a major Atlanta restaurant, data were collected for a sample of 49 customer
Eight chemical elements do not have isotopes (different forms of the same element having the same atomic number but different atomic weights)
What proportion of Americans get most of their news from the internet? According to a poll conducted by Pew Research Center, 40% get most of their news
If sample mean = 85, and n=64, construct a 95% confidence interval estimate for the population mean, mu.
When is it appropriate to use stratified random sampling.
The mean + sd of In [calcium intake (mg)] among 25 females, 12 to 14 years of age, below the poverty level is 6.56 + 0.64.
A human society claims that less than 35% of U.S. households own a dog. In a random sample of 400 U.S. households, 156 say they own a dog.
Heavy duty light bulbs made by a certain company claim to have lives that are normally distributed with a mean of 5000 hours and a standard deviation of 400
The number of staff personnel needed to handle patients at a medical center is determined by the mean time that patients must wait before being attended
In the week before and the week after a holiday, there were 10,000 total deaths, and 4972 of them occurred in the week before the holiday.
Find t-value for sample size n = 16 and area to the right 0.10