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Lifetimes of AAA batteries are approximately normally distributed. A manufacturer wants to estimate the standard deviation of the lifetime of the AAA batteries it produces. A random sample of 15 AAA batteries produced by this manufacturer lasted a mean of 9.8 hours with a standard deviation of 2.5hours. Find a 90% confidence interval for the population standard deviation of the lifetimes of AAA batteries produced by the manufacturer.
Carry your intermediate computations to at least three decimal places. Round your answers to at least two decimal places.
What are the lower and upper limits of the 90% confidence interval
a medical device manufacturer claims to have developed a thin aicd that contains a mean of no less than 41 joules of
Locate the results of a recent survey in a newspaper, magazine, or Internet article. Outline the survey data so that your peers can understand the variables and results, and then identify at least one key formula from this Module that you could us..
If you did not know anything about standard deviation of population from which sample was taken, find out the 95% confidence interval for mean test score.
Take a deck of cards. A deeck has 52 cards with two major colors(Red and Black), with 26 cards each. Red colors comes in two shapes(heart and diamond)
Examine the claim of the health plan, assume further that we collected data depicting the lengths of stay of 40 patients who were hospitalized recently with coronary heart disease.
Many educators feel their grades should fit a normal distribution and often apply curves to make them fit one. One way to do this is to convert numeric grades to z scores using the mean and standard deviation for the grades, then use an equation s..
Explain why those rates may be more meaningful as a measure of change across time than the actual numbers of those events.
in the country of united states of heightlandia the height measurements of ten-year-old children are approximately
Calculate the average or the median of the average or medians of the samples and compare it with the average of the population.
an experimenter has prepared a drug dosge level that she claims will induce sleep for 80 of the people suffering from
question 1new spark plugs have just been installed in a small airplane with a four-cylinder engine. there is one spark
The average buglary rate for a juisdiction has been 311 per year with a standard deviation of 50 what is the probability that next year the number of burglaries will be more than 350.
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