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A newspaper reports that the governor s approval rating stands at 65%. The article adds that the poll is based on a random sample of 972 adults and has a margin of error of 2.5%. What level of confidence did the pollsters use?
Suppose you know that the distribution of sample proportions of nonresidents in samples of 200 students is normal with a mean of 0.04 and a standard deviation of 0.03.
Shoveling Heart Rates Because cardiac deaths appear to increase after heavy snowfalls, an experiment was designed to compare cardiac demands of snow shoveling to those of using an electric snow thrower.
since changing this statistics course to a new format i would like to be able to detect an increase of one letter grade
A package of seeds states that the probability of germination is 0.92. For a package containing 75 seeds, the mean and variance of the number of seeds germinating are:
A scientist examined the effect of temperature and catalyst on the yield of a reaction. He ran the experiment at both 150° and 200°C with two types of catalyst.
1. A zero-mean Gaussian random signal has the autocorrelation function of the form γX(τ) = 10e-0.1|τ| cos 2πτ. Write the covariance matrix for the signal sampled at four time instants separated by 0.5 seconds.
Given that the mean of 100 observations is 42.5 and that their standard deviation is 6.313, find the sum of the squares of the observations.
Would you expect the variance to be larger or smaller than the variance associated with the probability function used in the previous exercise? Verify your answer by computing the variance.
Your bank sends you a summary statement, giving the average amount of all checks you wrote during the month.- Using this and the information provided by the bank, can you figure out the amounts of the two missing checks?
They found that those with higher levels of cigarette use had lower GPAs, and vice versa. What can you rightfully conclude from this? Why? Be specific about what this kind of information may indicate and mean.
Experience indicates that 30% of the people entering a store make a purchase. Using (a) the binomial distribution and (b) the normal approximation to the binomial, ?nd the probability that out of 30 people entering the store, 10 or more will make ..
for a normal distribution with a zero mean and standard deviation of one use 10 random variables samples to compute the
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