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A large university is interested in the outcome of a course standardization process. They have learned that 150 students of the total 1500 students failed to pass the course in the current semester. Construct a 99% confidence interval on the population proportion of students who failed to pass the course. Was the normality condition met for the validity of the confidence interval formula?
When a 99% confidence interval is calculated instead of a 90% confidence interval with n being the same, the margin of error will be
among the 15 scientists working on a research project 10 have ph.d.s. if four of these scientists are chosen at random
during a gas leak it is known that there is a 25 risk of developing breathing problems. in the midst of a recent gas
one classic use of the normal distribution is inspired by a letter to dear abby in which a wife claimed to have given
Looking at the data, the manufacturer is incorrect in its label claim. Perform hypothesis testing to prove or disprove it. Is the manufacturer correct in its label claim? Explain.
A pollster calls 500 randomly selected people and all 500 respond to her first question. Because the subjects agreed to respond, is the sample a voluntary response sample?
If the standard deviation is 20 pounds, and the weight gain is normally distributed, how many hogs should receive the new experimental diet?
A researcher wants to know if elderly people who own dogs are equally as likely to pay visits to their doctors than those who do not own dogs.
a researcher reports that when groups of four children are randomly selected from a population of couples meeting
Someone tells you that 50% of the tickets in the box show positive numbers. Do you believe it? Answer yes or no, and explain.
Determine the coefficient of determination R 2 . Determine standard error of the estimate s e .
a stock just paid a dividend of d0 1.50. the required rate of return is rs 10.1 and the constant growth rate is g
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