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During a natural gas shortage, a gas company randomly sampled residential gas meters in order to monitor daily gas consumption. On a particular day, a sample of 100 meters showed a sample mean of 250 cubic feet and a sample standard deviation of 50 cubic feet. Provide a 90% confidence interval estimate of the mean gas consumption for the population.
Determine the speed of the bullet. The spring has a stiffness k = 200 N.m and is originally unstretched.
an entomologist writes an article in a scientific journal which claims that fewer than 20 in ten thousand male
1. Researchers tested farm-raised salmon from two different farms for organic contaminants. One measure they collected was the concentration of the carcinogenic insecticide mirex (parts per million).
What internal and external threats are and could you provide some examples of what would be considered a threat to internal and/or external validity of a study design.
an observational study investigates the connection between aspirin use and three vascular conditions - gastrointestinal
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a team of experts is examining the reliability of lie dector tests. to determine the probability that a lie detector
please help and provide the worked out problems and answers. if the script and results of program r is know for this
What then is the probability that a shaft will be acceptable? Suppose that the diameter of the shaft is a random variable that is Normally distributed.
to study the birth weight of infants whose mothers smoke a physician records the weights of 100 newborns whose mothers
aj auction sells art drawings of little known artists at auction. the dealer is interested in the relationship between
in a hospital the time of birth of a baby within an hour interval eg between 500 and 600 in the morning is uniformly
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