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Failure times of silicon wafer microchips. Researchers at National Semiconductor experimented with tin-lead solder bumps used to manufacture silicon wafer integrated circuit chips (International Wafer Level Packaging Conference, November 3-4, 2005). The failure times of the microchips (in hours) were determined at different solder temperatures (degrees Centigrade). The data for one experiment are given in the next table (p. 208). The researchers want to predict failure time (y) based on solder temperature (x).
(a) Construct a scatterplot for the data. What type of relationship, linear or curvilinear, appears to exist between failure time and solder temperature?
(b) Fit the model, E(y) = β0 + β1x + β2x2, to the data. Give the least squares prediction equation.
(c) Conduct a test to determine if there is upward curvature in the relationship between failure time and solder temperature. (Use α = .05.)
Suppose two such fuses are in series and operate independently in a system. Find the pdf of the lifetime Y of the system. (The system will work only if both the fuses operate.)
Construct a 95% confidence interval estimate for the proportion of all workers who did not use the Internet within limits. Explain your findings so that your non-quantitative partner will understand them.
Consider the criminological data of Table 7.1 (Example 7.1): (a) Repeat the analysis using (1) the matrix YTY and (ii) the cosine matrix (Section 2.4). Compare your results.
What is the 25th percentile of a X² distribution with 20 degrees of freedom? What symbol is used to denote this value?
What is the probability of a flood of that magnitude or greater occurring during the next year - what is the probability of it not occurring during the next year?
They found that children who averaged more than two hours of television viewing per day when they were younger than 3 tended to score lower on measures of reading ability and short term memory. Is the study described an observational study or an e..
He was the President of the Confederate States of America, Commander - in - Chief of the Confederate Army, a colonel in the United States Army during the Mexican-American War, Secretary of War and also a United States Senator.
The following data are provided by Pearson (1904) concerning joint father's and son's occupations:
Suppose that, for our sample, the mean weight is 11 pounds. How con?dent can we be that the population mean is between 10 and 12 pounds?
inverse probability based on normal distribution.the mean price of new homes from a sample of houses is 155000 with a
A helicopter with a load on the end of a cable is shown in Figure AP8.4 (a).The position control system is shown in Figure AP8.4 (b), where the visual feedback is represented by H(s). Sketch the Bode diagram of the loop transfer function L(jω) = ..
assume that the data has a normal distribution. also assume that the standard deviation of the population sigma is
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