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Assuming that the measurements are normally distributed with expectation equal to the correct percentage, each student calculates a 95% condence interval for the percentage based on his or her data. When the results are collected, two of the students discover that their condence intervals dont even overlap. A student in the course who is also taking Stat 311 claims that this result is not surprising. Do you agree?
A civil service exam is given to 200 job applicants. In recent years, grades have followed a normal distribution with mean 66.5 and variance 100. The grades of the job applicants are distributed as follows:
How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 5% with 98% confidence?
What is the importance of pretesting questions and instruments? What are risks of not doing this? Provide an example.
Create a linear model to estimate the number of points students will score on the next exam from the number of hours the student studies.
Describe each of the following methods of statistical inference in detail (Please try to use layman's terms).
Find the critical F value for the Following,
One day, you notice your 6' 2" roommate's size 12 shoes and comment, "I think height and foot size are correlated". You're somewhat surprised (and irked) by his response, "I think short people have big mouths."
A study was conducted to determine whether there were significant differences between medical students admitted through special programs (such as affirmative action) and medical students admitted through regular criteria.
Suppose that 20 students have registered for course this semester. Determine the probability that two or fewer will withdraw? Determine the probability that exactly four will withdraw?
A psychology professor is interested in whether implementing weekly quizzes improves student learning. She decides to use the weekly quizzes in one section of her introductory psychology class and not to use them in another section of the same cou..
Mark makes it a policy not to buy bananas unless the price is 33 cents or less per pound. What proportion of the time would he buy bananas?
As part of a study of corporate employees, the Director of Human Resources for PNC, Inc. wants to compare the distance traveled to work by employees at their office in downtown Cincinnati with the distance for those in downtown Pittsburgh.
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