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A newspaper reports that the governor's approval rating stands at 69%. The article adds that the poll is based on a random sample of 726 adults and has a margin of error of 4%. What level of confidence did the pollsters use?
The mean return for the random sample of 33 mutual funds is 14.93 percent with a standard deviation of 9.57. Test the null hypothesis: H0: mu = 15% at α = 0.05.
You're in charge of an experiment to evaluate a treatment which is advertised as being 90% effective at killing a particular insect. You plan an experiment in which the treatment is tested on 200 insects.
the number of viewers of american idol has a mean of 29 million with a standard deviation of 10 million. assume this
The tolerance of the automatic filling machine, leads to weights of bags being approximately Normally distributed with standard deviation 5g.
what is the difference between measures and reperated measures studies. how did we deal with theae differently
Given a binomial distribution with n=29 and p=0.83, would the normal distribution provide a reasonable approximation? Why or why not.
Let T have the exponential distribution with parameter lambda, and let Y=Sqroot(T).
assume that a procedure yields a binomial distribution with a trial repeated n times. use a binomial probabilities
After 1,000-trial simulation, examine statistical information generated and compare output of simulation with your findings in Problem .Briefly describe the significant similarities and differences.
a sample of 100 people is classified by gender malefemale and by whether or not they are registered voters. the sample
the lengths of pregnancies of humans are normally distributed with a mean of 268 days and a standard deviation of 15
A sample of 19 albino Hungarian banded aardvarks was examined for nose length. Since this is a small sample, how various degrees of freedom will be used to find the t-score.
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