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A bus passes by a certain street corner every morning around 9:00 a.m. Let X be the difference (in minutes) between the time instant at which the bus passes and 9:00 a.m. We suppose that X has approximately a N(µ = 0, | ?2 = 25) distribution. We consider two independent days. Let Xk be the value of the random variable X on the kth day, for k = 1, 2.
a) Calculate the probability P(X1 ? X2 > 15).
b) Find the joint density function fX1,X2(x1, x2).
c) Calculate (i) P(X1 = 2 | X1 > 1) and (ii) P(X1 < 2 | X1 = 1).
He argues that the regression effort says people who perform very poorly in their previous job tend to perform well in their next job. Is this what the regression effect says? Explain.
A certain type of lightbulb has an average life of 500 hours with a standard deviation of 100 hours. The length of life of the bulb can be closely approximated by a normal curve.
shown here are the data for y and three predictors x1 x2 and x3. a multiple regression analysis has been done on these
the national safety council released the following data on the incidence rates for fatal or lost-work time injuries
from a population that is not normally distributed and whose standard deviation is not known a sample of 6 items is
in a standard normal distribution what must z be such that p-zlt z lt z
What is the probability that an individual will be a salaried employee whose intrinsic satisfaction value is 5 or more?
in a pew research center poll of 800 randomly selected adults 600 said that it is morally wrong to not report all
Annual family dental expenses for the families of a random sample of ten employees of a company are given below. You can assume the family dental expenses for the employees of the company are normally distributed.
a pizza house is considering offering the following special pizza delivered in less than 30 minutes or the pizza is
Want a sample size of about 60 (30 controls and 30 cases). At 5% significance and 80% power.How do i determine the standard deviation and mean difference.And how do i arrive at the 60? my study design is case-control.
Standard deviation of 3.2 days. If a nursery plants 100,000 of these seeds, how many will germinate in less than 20 days?
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