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A person leaves for work between 8 am and 8.30 am and takes between 40 and 50 minutes to get there. Let the random variable X denote her time of departure and the random variable Y the travel time. Assume that these random variables are independent and uniformly distributed, find the probability that the person arrives to work before 9 am. (Hint: What is the interpretation of the random variable X + Y ?)
Determine the following areas under standard Normal distribution curve.
you wish to test the claim that u gt 11 at a level of significance of ? 0.05 and are given sample statistics n 50
Construct a 99% confidence interval for the difference between the true average boot times of the two types of hard drives. Assume the difference will represent (HDD-SSD) and that the population standard deviations are statistically the same.
A random sample of n=100 observations is selected from a population with mean of 29 and sandard deviation of 21. Approximate the probabilities shown below
In standard normal distribution standard deviation is always ___.
an ap statisctics group asked an srs of 20 boys at their school how many shoes they have. a 95 confidence interval for
you are given 10 multiple choice questions with 5 choices each of which only one is correct. if you try and guess the
Write the linear regression equation to forecast father's education from mother's education?
Create an equation for which the appropriate test of the statistical hypothesis would require the use of a z-score. (For the population mean for the variable of interest, you may invent a hypothetical population mean for the sake of this equation...
Suppose that 80% of all batteries have acceptable voltages, and let y denote the number of batteries that must be tested. What is p(2), that is, P(y=2).
the number of telephone calls coming into a businesss switchboard averages 4 calls per minute.let x be the number of
A researcher tested the reading ability of two groups of primary care patients. The scores on the test range from 1 to 9 with 9 indicating a high degree of reading ability and 1 very limited reading ability.
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