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You want to know if there's an association between college students' spring break destinations and what year they're in. You take a random sample of 405 college students and record the following data:
Amusement Parks Mexico Home Other
Freshman 23 21 43 21
Sophomore 34 23 14 26
Junior 25 30 23 26
Senior 27 33 17 19
A. Set up your null and alternative hypothesis.
B. What are your degrees of freedom?
C. Using your T-83, compute the expected values for each cell.
D. Will a chisquare hypothesis test of independence be valid in this situation? Explain.
E. What are your test statistic (X^2) and P-value?
F. What can you conclude if alpha(a) = .01?
An official of the Iowa department of Highways wants to compare the useful life, in months, of two brands of paint used for striping roads. The mean number of months Cooper Paint lasted was 36.2
A sample of 64 account balances from a credit card company showed an average balance of $1,040. A previously determined population standard deviation is $200.
james teaches a class of 300 students and only 6 have done their homework assignment which is due today. he calls on a
Angela works as a quality supervisor. She has uncovered a quality issue with safety brackets on baby swings. Angela determines that 21% of the safety brackets are out of spec.
q1. suppose that x xijnx2 is an observed data matrix from a bivariate normal distribution nmusigma2i where i is the 2
a water treatment plant needs to maintain the ph of the water in the reservoir at a certain level. to monitor this they
List at least 3 qualitative attributes of the snack food about which they might want to ask consumers. Make sure at least one of them is nominal.
In a test of the MicroSort method of gender selection, 51 babies are born to couples trying to have baby boys, and 39 of those babies are boys (based on data from the Genetics & IVF Institute).
If we wanted to shorten the interval of the estimation of the true mean of Saturday sales to a width of $600 in total, what should the size of our sample be to achieve it?
From Company B, 850 stereos are purchased and 6% are found to be defective. Given that a stereo is defective, find the probability that it came from Company A.
As a condition of employment, Fashion Industries applicants must pass a drug test. Of the last 220 applicants 14 failed the test. Develop a 99 percent confidence interval for the proportion of applicants that fail the test. Would it be reasonable ..
The mean noise level for 24 hospital operating rooms was 56.3 dBA and the standard deviation was 7.5 dBA. At α = .05 can it be concluded that there is a difference in means?
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