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The IQs of 17 students from one area of a city showed a mean of 106 with a standard deviation of 10, whereas the IQs of 14 students from another area showed a mean of 109 with a standard deviation of 7. Test for equality of variances between the IQs of the two groups at α = 0.02.
in a sample of children given a new flu vaccine a large number of the children develop a neurological disease. parents
a group of 10 people begin a chain letter with each person sending the letter to four other people. each of these
a major u.s. automaker has determined that the city mileage for one of its new suv models is normally distributed with
If a group is chosen from a population on the basis of sharing the same percentages of trait features as known to exist in the population, then the group so chosen would constitute:
age at onset of dementia was determined for a sample of adults between the ages of 60 and 75. for 15 subjects m 67.2
Professor Jennings claims that only 35% of the students at Flora College work while attending school. The dean thinks that the prof. has underestimated the number of students with part-time or full-time jobs.
Construct four questions, each question reflecting one of the four corresponding levels of measurement, that a mortgagor (borrower) would answer relevant to their home mortgage.
A random sample of n = 16 scores is selected from a normal distribution with a mean of μ = 50 and standard deviation of σ = 10. a) What is the probability that the sample mean will have a value between 45 and 55?
Students are the University of New Harmony received 10, 000 course grades last semester. The table below breaks down these grades by which school of the university taught the course.
A presidential candidate's aide estimates that, among all college students, the proportion p who intend to vote in the upcoming election is at least 60%.
Find the critical value for zα/2 that corresponds to a degree of confidence of 98%. Find the margin of error for the 95% confidence interval used to estimate the population proportion with n = 163 and x = 96
Nrmal distribution
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