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1. It is reported that 50% of all computer chips produced are defective. Inspection ensures that only 5% of the chips legally marketed are defective. Unfortunately, some chips are stolen before inspection. If 1% of all chips on the market are stolen, find the probability that a given chip is stolen given that it is defective.
2. As society becomes dependent upon computers, data must be communicated via public communication networks such as satellites, microwave systems, and tele-phones. When a message is received, it must be authenticated. This is done by using a secret enciphering key. Even though the key is secret, there is always the probability that it will fall into the wrong hands, thus allowing an unauthentic message to appear to be authentic. Assume that 95% of all messages received are authentic. Furthermore assume that only .1% of all unauthentic messages are sent using the correct key and that all authentic messages are sent using the correct key. Find the probability that a message is authentic given that the correct key is used.
What standard deviation of the sample mean do you need such that 95% of all samples will have a mean within 0.05 hours of μ?
What are the 2 defining characteristics of a data set? explain in sufficient detail. Use ways of describing those characteristics that are commonly seen in statistics and real world application. Examples using made-up data sets might aid your expl..
Using the empirical rule, what is the approximate percentage of women between 156cm and 166cm? Using Chebyshev's Theorem, at least what percentage of women are between 149cm and 173cm?
Conduct a statistical analysis (at a = .01) to determine if the true mean performance level for students in the rudeness condition is lower than the true mean.
he difference in the percentage of participants who quit (20% versus 46%) was statistically significant. What conclusion can be made on the basis of this study?
Averages versus individuals. Scores on the ACT college entrance examination vary Normally with mean µ = 18 and standard deviation s = 6.
when parking a car in a downtown parking lot drivers pay according to the number of hours or fraction thereof. the
Recently, research efforts have focused on the problem of predicting a manufacturer's market share by using information on the quality of its product.
Compare scent and no scent data for occasion 1 using difference scores via the command trimci(scent[,7]-scent[,10],tr=0), so the mean of the difference scores is being used. Verify that the p-value is 0.597.
hen investigating a relationship between birth weight and IQ, researchers found that 258 subjects with extremely low birth weights (less than 1000 g) had Wechsler IQ scores at age 8 with a mean of 95.5 and a standard deviation of 16.0.
Parametric tests (such as t or ANOVA) differ from nonparametric tests (such as chi-square) primarily in terms of the assumptions they require and the data they use. Explain these differences.
Do you believe that the press has a right to be present duringr tials? Why or why not? Explain your position?
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