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In 2002, 40% of the students at a major university were Business majors, 35% were Engineering majors, and the rest of the students were majoring in other fields. In a sample of 600 students from the same university taken in 2003, 200 were Business majors, 220 were Engineering majors, and the remaining students in the sample were majoring in other fields. Using α = .05, test to see if there has been a significant change in the proportions between 2002 and 2003. Please show working.
What statistical test should be used to analyze the data and identify H0 and Ha for this study.
the length of time in seconds that a user views a page on a web site before moving to anotherpage is a lognormal random
question an opportunity sample of 50 undergraduate students was asked to complete a series of personality
Why would the random variable y, defined as y 5 x2 2 x1, be of interest to the furniture manufacturer? What is the mean value of the random variable y? Assuming that x1 and x2 are independent, what is the standard deviation of y?
Use the Histogram option in Data Analysis to check the assumption of normality. Comment on the findings.
The margin of error for polling results is typically determined as the half-width of a 95% confidence interval. With respect to a particular ballot proposition
supposed that a b and c are mutually independent events and that pa0.5 pb0.8 and pc0.9. find the probabilities that
assume that the number of students who successfully complete this course with a grade of lsquoc or better has a
if a sample is subdivided into subsamples a minimal sample size of 30 is necessary for every subsample?a. trueb.
A researcher follows 200 women who exercise regularly and 300 women who do not exercise regularly. After 30 years of follow-up, 20 of the women in the exercise group are diagnosed with osteoporosis while 30 women in the non-exercise group are dia..
A communications network has a built-in safeguard system against failures. In this system if line I fails, it is bypassed and line II is used. If line II also fails, it is bypassed and line III is used. The probability of failure of any one of the..
If the line is busy or if there is no answer, she uses the next number on her list as a replacement. Comment on both the randomness and the representativeness of the sample of persons who end up being interviewed.
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