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A man has n keys on a key ring, one of which opens the door to his apartment. Having celebrated a bit too much one evening, he returns home only to find himself unable to distinguish one key from another. Resourcesful, he works out a fiendishly clever plan: He will choose a key at random and try it. If it fails to open the door, he will discard it and choose at random one of the remaining n-1 keys, and so on. Clearly, the probability that he gains entrance with the first key he selects is 1/n. Show that the probability that the door opens with the third key he tries is also 1/n.
Camera, 28% had a music player, and 22% had both. What is the probability that a cell phone sold last month had a camera or a music plaer?
Find the expected frequency to test the claim that walking and low, moderate, and high blood pressure are not related. Round to the nearest tenth if necessary.
how would you explain the analysis of variance assuming that your audience has not had a statistics class
If the standard deviation of the process is unknown, another approach is to use the sample range as a measure of process variability. Calculate the control limits for the above process using the sample range.
A side effect of a certain anesthetic used in surgery is the hiccups, which occurs in about 10 percent of the cases. If three patients are scheduled for surgery today and are to be administered this anesthetic, compute the probability that:
1.a company makes molded plastic toys. they study the plastic injection process into the molds. a common cause of
Compute the mean and standard deviation of the scores and use these for the calculations below. Show your calculations on the back of his page.
the state education department requires local school districts to keep these records on all students age race or
Assuming that n = 6 for both samples, calculate each of the sample variances, then calculate the pooled variance. Because the samples are the same size, you should find that the pooled variance is exactly halfway between the two sample variances.
Formulating null and alternative hypothesis to test the claim averaging about $5000.
Derive rules to test whether a number is divisible by N, where N ranges from 2 to 13. E.g. A number is divisible by 3 if the sum of the digits is divisible by 3.
a researcher conducts a study of white and black attitudes toward the police in her community.the percentage of white
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