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Suppose that four tickets will be given prizes in a lottery having 30,000 tickets. What is the probability of winning at least one prize if you buy 1,000 tickets?
to find the sample size needed for a hypothesis test if ho mu10 ha mult10 sigma is unknown alpha 0.01 beta 0.05 and e
A machine for making nuts is known to create nuts with a standard deviation in size of 0.20mm. A tradesman is required to adjust the machine to make 49mm nuts.
Assuming that the manager's claim is correct, calculate the probability that 117 or fewer of 205 randomly selected marketing researchers would disapprove of the scenario.
11) The time taken to assemble a car in a certain plant is a random variable having a normaldistribution of 20 hours and a standard deviation of 2 hours. What is the probability that a car canbe assembled at this plant in a period of time:a. le..
an applicant must score at least 80 points on a particular psychological test to be eligible for the peace corps. from
an exit poll of 1000 randomly selected voters found that 515 favored candidate a. is the race too close to call? answer
A sociologist is studying the prevalence of crime in one major city. In a sample of 225 randomly selected residents, 60 say that they have been victimized by a criminal.
question the performances of a group of interns are evaluated by their supervisors at the end of their
At.05 level of significance, is there evidence to propose that mean life length of batteries produced by this manufacturer is more than 400 hours?
First part of this theorem allows a problem solver to compute probabilities about sample means regardless of whether a population is normally distributed.
With a standard deviation of 9.87 minutes. At the 0.05 level of significance, test the claim that at this airport the mean wait for takeoff is less than the mean wait for baggage.
The sample size of 8 and 10 respectively. cant it be concluded at alpha .05 that the average size of the famrs in the 2 counties are different? assume the populations are normallyh distributed.
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