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For a given population of high school seniors, the Scholastic Aptitude Test (SAT) in mathematics has a mean score of 520 with a standard deviation of 120. Another widely used test is American College Testing (ACT) exam. The mathematics portion of the ACT has a mean of 19 and a standard deviation of 7. Both SAT and ACT scores are normally distributed. What is the probability that a randomly selected high school senior's score on the mathematics part of the SAT will be
(a) more than 630?(b) less than 425?(c) between 425 and 630?
A random sample of 48 managers of large hotels has mean X‾= 5.91. The null hypothesis for the researcher's test is?
A test consists of multiple-choice questions, each having four possible answers (a,b,c,d) one of which is correct. Assuming that you guess the answers to six such questions.
What is the probability of a false negative test (the probability that a person having muscular distrophy tests negative)?
Test at 5% and 1% whether the molder is operating satisfactorily.
Determining the probability that the two choose the same number?
At the .10 significance level you will test to determine if there has been an increase in selling time. Assuming we are using a t test what will be the critical value"?
A fair coin is continually flipped until heads appears for the tenth time. Let X denote the number of tails that occur. Compute the probability mass function of X.
The amounts were normally distributed with a standard deviation of 10 and 12 for men and women, what is the probability that man will spend at most an hour?
Distribution with the mean of 10,000 hours. Component has already been in operation for its mean life. Determine the probability that it will fail by 15,000 hours?
Complete hypothesis test using a 5% level for risk with directional research hypothesis.
It is known that in a sack of mixed bean seeds, 35% are yellow beans. Use the normal approximation to the binomial distribution to find the probability that in a sample of 400 beans there are
Perform a contingency analysis on the data to determine if there is any dependency between the number of level of education attained by the father and the size of his family.
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