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The lifetimes of light bulbs of a particular type are normally distributed with a mean of 280 hours and a standard deviation of 5 hours. What percentage of the bulbs have lifetimes that lie within 1 standard deviation to either side of the mean?
according to an airline a particular flight is on time 95 of the time suppose 120 flights are randomly selected
Given the following sample information, test the hypothesis that the treatment means are equal at the .05 significance level.
individual public health and health care paper resource public health and health care paper grading criteria on the
a company makes electric motors. the probability an electric motor is defective is 0.01. what is the probability that a
Assume that you want to use a 0.05 significance level to test the claim that paired sample data come from a population for which the mean difference is Ud = 0. Find (a) d-, (b) Sd, (c) the t test statistic, and the critical values.
to find the drag on an airplane whose velocity is 167 ms could one test a 1 25 scale model in a subsonic local match
epa studies of fuel consumption indicate compact car mileage to be normally distributed with a mean of 25.5 miles per
One of 4 bus drivers is also arbitarily chosen. Let Y denote number of students on his bus. Calculate expectations and variances of X and Y.
Construct a 90 percent confidence interval for the true mean weight. Describe factors which might cause variation in the weight of Tootsie Rolls during manufacture.
A company has 25 cars of this model. What is the probability that the mean nitrogen oxide emissions of these cars is above the 0.3g/mi limit?
Z score on comparison distribution for sample score and your conclusion. Suppose that all population are normally distributed.
A portfolio p of consisting 60% of stock X and 40% of stock Y, has a correlation ρpM = 0.62 with the market. What is the portfolio volatility? Statement on the diversification effect.
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