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1. A survey of college women. A sample survey interviews an SRS of 280 college women. Suppose (as is roughly true) that 70% of all college women have been on a diet within the last 12 months. What is the probability that 75% or more of the women in the sample have been on a diet?
2. Plastic caps for motor oil containers. A machine fastens plastic screw-on caps onto containers of motor oil. If the machine applies more torque than the cap can withstand, the cap will break. Both the torque applied and the strength of the caps vary. The capping-machine torque has the Normal distribution with mean 7.0 inch-pounds and standard deviation 0.9 inch-pounds. The cap strength (the torque that would break the cap) has the Normal distribution with mean 10.1 inch- pounds and standard deviation 1.2 inch-pounds.
(a) Explain why it is reasonable to assume that the cap strength and the torque applied by the machine are independent.
(b) What is the probability that a cap will break while being fastened by the capping machine?
Poisson random variable with a mean rate of 8 messages per hour. What is the probability that fewer than three messages are received in one-half hour?
in an experiment designed to study the effects of illumination level on task performance subjects were required to
find the value of z that would be used to test the difference between the proportions given the following. use g - h.
What proportion of children 10-15 years would be classified as hyperlipidemia(assume that hyperlipidemia is defined as a total cholesterol level over 200)?
In the previous exercise there were two possible outcomes; reject the null hy- pothesis or fail to reject the null hypothesis. Explain in your own words what is meant by these outcomes.
In regards to the statistics paper you helped me with. Can you do a conclusion of the findings. I can edit it to my communication style, but I do need to do the following:
in a test of the hypothesis h0 u -60 versus h u 60 a sample of n 50 observations possessed mean x 60.6 and standard
If you are using the method of least squares for fitting trends in an annual time series containing 25 consecutive yearly values.
For a sample of 240 students selected at random, what is the mean and variance of the number of students who watch this game?
How can you can discriminate between data that can be analyzed with the chi square and data that can be analyzed with the ANOVA?
business travelers use laptop computers on overnight business trips. State the hypotheses and test the assumption that two third of business travelers use a laptop (α = 0.05).
It was reported that 20 readers responded and 87% said "no" while 13% said "yes." Recognize 4 major flaws in this survey.
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