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In a large class, 60% (0.60) are science majors and 40% (0.40) are liberal arts majors. Twenty percent (0.20) of the science majors are seniors, whereas 30% (0.30) of the liberal arts majors are seniors. (Ask yourself, "Why is there a lot of space below?")
a. The teacher randomly selects a student and the student indicates that she is majoring in science. Given that the student is majoring in science, what is the probability that she is a senior?
b. What proportion of the students in the class are seniors?
Converting a two-sided P-value. You use statistical software to perform a significance test of the null hypothesis that two means are equal.
the u.s. department of transportation reported that during november 83.4 of southwest airlines flights 75.1 of us
The model for AMAZON stock prices has been found to be AR(1) with Xt = 0.99Xt-1 + a, where a is NID(0,46.8).
You are testing a null hypothesis that there is no linear relationship between two X and Y. From your sample of n=20, you determine that SSR=60 and SSE=40
McDonald's had 33 orders that were not accurate among 362 orders observed. Construct a 95% confidence interval for the proportion of orders.
1. dependent system a) a system that is dependent b. a system that depends on a variable
The data in Display 3.11 are yearly skin cancer rates (cases per 100,000 people) in Connecticut, with a code identifying those years that came two years after higher than average sunspot activity and those years that came two years after lower tha..
Hot dogs Are hot dogs that are high in calories also high in salt? The figure below is a scatterplot of the calories and salt content.
The Quantitative Environmental Learning Project reports that the second-biggest source of lead in municipal solid waste is from cathode ray tubes
The following is a probability distribution of the number of defects on a given contact lens produced in one shift on a production line:
Calculate the amount of the firm's income before tax?
Let Y denote the diameter in millimeters of Styrofoam pellets used in packing. Assume that Y has a log-normal distribution with parameters µ = .8 and a = .1.
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