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Sixty-four randomly selected fuses were subjected to a twenty percent overload, and the time to failure was recorded. It was found that the sample average and standard deviation were x bar = 8.5 and s= 2.4 respectively.
a) Test H0:mu=8 aganist H1:u>8; use a significance level of alfa=0.05 what is your conclution?
Nine percent of undergraduate students carry credit card balances greater than $7000. Presume 10 undergraduate students are selected randomly to be interviewed about credit card usage.
ambulance response time is measured as the time in minutes between the initial call to emergency medical services ems
The number of degrees of freedom corresponding to between treatments is:
A random sample of 10 observations from one population revealed a sample mean of 23 and a sample deviation of 4. A random sample of 8 observations from another population revealed a sample mean of 26 and a sample standard deviation of 5.
a simple random sample of 300 properties is taken from a collection of 9500 properties 3000 of which do not have
What do confidence intervals represent? What is the most controllable method of increasing the precision of or narrowing the confidence interval?
We are intersted in the number of students who prefer brand C cola. identify the distribution of the random variable and the mean,standard deviation.
If a random sample of 40 voters is chosen, approx. the probability that more than 20 favor this candidate. Use the normal approximation to the binomial with a correction for continuity.
question use the program binomial probabilities to find the probability that in 100 tosses of a fair coin the number of
assuming that the number of network errors experienced in a day on a local area network lan is distributed as a poisson
The number of hurricanes that are formed during each hurricane season can be modeled using the Poisson probability distribution.
What is the probability that more than 88 cartons arrive in at least 5 of the next 6 months given normal distribution with mean of 80 cartons per month and standard deviation of 7 cartons per month?
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