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A railway has 20 stations. A one-way trip involves travel from any one station to any different station.
(a) How many different kinds of one-way trip tickets must be printed if each ticket identi?es the departure station and also the destination?
(b) How many different kinds of one-way trip tickets are needed if each ticket says only "for travel between" one station and another, and may be used in either direction between the two stations
Exponential distribution with a mean of 4 minutes. What is the probability that a person is served in less than 3 minutes on at least 4 of the next 6 days.
The Medical Officer of Health in charge of day clinics in the Butterworth district is planning for the expansion of the medical facilities at these clinics based on the growth in demand for the clinics' services.
Engineers want to design seats in commercial aircraft so that they are wide enough to fit 98% of all males. (Accommodating 100% of males would require very wide seats that would be too expensive.)
The following number of grades were recorded. Find the critical value to determine if the grade distribution for the department is different than expected. Use α = 0.01.
Use this information to develop a 95% confidence interval to estimate the production variance for the hourly wages of production workers in U.S. What is the value of upper limit of this confidence interval?
Develop a 95% confidence interval estimate of the mean amount spent per day by a family of four visiting Niagara Falls (to 2 decimals).
denote by a b and c the events that a grand prize is behind doors a b and c respectively. suppose you randomly picked a
the skin cancer prevention study dataset can be found at the fitzmaurice website linked to the book applied
An ANOVA procedure is used for data that was obtained from four sample groups each comprised of five observations. The degrees of freedom for the critical value of F are:
a^2 + b^2=c^2 + d^2 where a,b,c,d are real numbers(describe equivalence cl). For a pair of fractions a/b and c/d define a/b ~ c/d if ab=cd(same here)
Do you expect the 95% confidence interval for the true proportion of all 18- to 29-year-olds who think the U.S. is ready for a woman president to be wider or narrower than the 95% confidence interval for the true proportion of all U.S. adults? Exp..
One bus has a routa that takes 25 minutes. The other bus has a routa that takes 55 minutes. Both buses leave the bus- stop leaves at 6 a.m and run continuously. What is the next time that the buses will stop together
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