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Gas chromatography. Gas chromatography is a technique used to detect very small amounts of a substance, for example, a contaminant in drinking water. Laboratories use regression to calibrate such techniques. The following data show the results of five measurements for each of four amounts of the substance being investigated.22 The explanatory variable x is the amount of substance in the specimen, measured in nanograms (ng), units of 10-9 gram. The response variable y is the reading from the gas chromatograph.
(a) Make a scatterplot of these data. The relationship appears to be approximately linear, but the wide variation in the response values makes it hard to interpret.
(b) Compute the least-squares regression line of y on x, and plot this line on your graph.
(c) Now compute the residuals and make a plot of the residuals against x. It is much easier to see deviations from linearity in the residual plot. Describe carefully the pattern displayed by the residuals.
What caused the crash of TWA Flight 800 in 1996? Physics professors Hailey and Helfand of Columbia University believe there is a reasonable possibility.
Commercial A was selected by 60 women and by 63 men. Find the odds of selecting Commercial A for the men. Do the same for the women.
What additional strategies (up to 3) you would propose that may increase validity of the findings.
in a community with a population of 10000 people the prevalence of a certain disease is 5. a screening test for this
There were a large number of foreclosures of family homes. In one large community, realtors randomly sampled 36 bids from potential buyers to determine the average loss in home value. The sample showed the average loss was $11,560 with a standard ..
A computer lab at a small college has 25 computers. Twice during the day, a full scan for viruses is performed on each computer.
A sample of size 9 is drawn at random from a Normal distribution. The experiment has a null hypothesis of μ = 0 and an alternate hypothesis of μ > 0. The mean of the sample is 7 with an s of 8. Is there a difference at the 1% level?
Evaluated that there is a 95% probability of only slight losses of around $1 million. Using decision tree analysis, determined whether bank must install new power generator.
If "Some obsessive-compulsive behaviors are not curable diseases" is true, what is the truth value of the following statements?
In a sample of 210 members, 160 employees took all of their vacation days. Therefore, the test statistic is 1.38. When testing the executive's (using a 1% level ofsignificance), what is the pvalue?
in a poker game 5 cards are dealt from a standard 52 card deck that has been well shuffled. you are the only player in
Question 1: At the PISA Web site (www.pisa.oecd.org), there are summary statistics for math scores of 15-year-old males and females for various countries separately. The mean math scores for males, the mean math scores for females, and also the di..
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