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A large highschool has approximately 1200 seniors. The administration of the school claims that 87% of its graduates are accepted into colleges. If a simple random sample of 80 seniors is taken, what is the probability that at most 64 of them will be accepted into college.
Customers arrive to the company at a rate, on average, of one per hour with a Poisson distribution. The company is staffed by a single individual(the owner) who takes on average 30 minutes with each customer with a standard deviation of 15 minute..
The number of degrees of freedom associated with the t test, when the data are gathered from a matched pairs experiment with 13 pairs, is:
If jurors are selected randomly from an adult population, a nd the probability that all 12 jurors are white when the population is?
Name six virtues and characteristics of problems and hypothesis. Name some tips for identifying and developing formal research problems.
Why is cohort studies more expensive than case-control studies? I know one problem is cohort studies often must be followed up for a long period to determine whether the outcome of interest has developed and they are more expense than case-control..
What is the relationship between confidence intervals and hypothesis testing? How are they the same? How are they different?
Over many years of administering tests to my statistics students I have found that the overall average of the scores on the first exam that I give each semester is 76.
A pair of dice is tossed once. Let X denote the sum of the face values, and let Y denote the absolute value of the difference between the face values.
Choose a number at random from the set of numbers from the set of numbers {1,2,3,4,5}. Now choose a number from the subset {1,...,X). Call this second number Y.
Probability of a flush. Poker player holds flush when all 5 cards in hand belong to same suit (clubs, diamonds, hearts, or spades).
The weekly salaries of teachers in one state are normally distributed with mean of $490 and standard deviation of $45. Determine the probability that a randomly selected teacher earns more than $525 per week?
If the null hypothesis is rejected, can you state that the mean score of those with a rural background is different from the score of those with a large-city background?
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