Question: A random sample of 20 observations has been drawn from
A random sample of 20 observations has been drawn from a normal population, and the sample variance is found to be s2 = 4.53. Determine the 95% confidence interval for σ2.
Relevant QuestionsA pharmaceutical company has specified that the variation in the quantity of active ingredient in its leading prescription medication must be such that the population standard deviation must be no more than 1.20 micrograms. ...A random sample of n = 12 is drawn from a population that is normally distributed, and the sample variance is s2 = 19.3. Use α = 0.025 in testing H0: σ2 ≤ 9.4 versus H1: σ2. 9.4. The following data are the number of persons who were waiting in line at a checkout counter at 100 randomly selected times during the week. At the 0.05 level, test whether the population of these values could be Poisson ...Three different instructional techniques are being considered for training mechanics to perform a difficult emissions-reduction adjustment on fuel-injection engines. Each of 60 mechanics is randomly assigned to receive one ...A casting machine is supposed to produce units for which the standard deviation of weights is 0.4 ounces. According to the maker of the machine, it should be shut down and thoroughly examined for wear if the standard ...
Post your question