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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 psychologist has developed a test to measure self-control. The test is normed so that it has a mean of 100 and a standard deviation of 15... The scores are normally distributed in the population of college students used to develop the test.
if a coin is flipped 25 times with eight tails occuring what is the probability that no run of six or more consecutive
Company wishes to exceed on-time rate of competitors at new hub. Hundreds of flights arrive at location daily. Determine the main advantages and disadvantages of employing sampling in application?
Define a sample space and count the number of sample points for each of the following experiments: (a) Select at random a catcher, pitcher, first baseman, and second baseman from a group of 15 baseball players.
When it comes to advertising, "'tweens" are not ready for the hard line messages that advertisers often use to reach teenagers. The Geppeto Group study found that 78% of 'tweens understand and enjoy ads that are silly in nature.
Using the .05 level, what should the experimenter conclude? (a) Use the steps of hypothesis testing, (b) sketch the distributions involved.
in the week before and the week after a holiday there were 10000 total deaths and 4979 of them occcured in the week
What is the error made if we approximate the probability that 2.5 ≤ T ≤ 2.75 by using the standard approximation?
10-701 Machine Learning - Spring 2012 - Problem Set 5. What is the full likelihood of observed and latent variables: p(X, Z|Θ)? Note Z = {z1, . . . , zN} are the hidden states of the corresponding observations
suppose that two cards are randomly selected from a standard 52-card deck.a what is the probability that the first card
Determine the percentage increase in his real (inflation-adjusted) salary over the last three years. Which of the 4 methods of data collection was involved when he used the Consumer Price Index?
a sample of 85 male professors at a major four-year university produced a mean annual pay of 75600 and a standard
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