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Core samples taken from ocean floors are at times analyzed for plankton content in order to infer approximate climatological conditions which existed on earth. Since many species coexist at different times (core depths), their abundance is generally correlated, and a factor analysis is frequently performed on such data. Table 7.15, represents an excerpt of data given by Imbrie and Kipp (1971) for n = 110 core depths of a single core, where each depth represents 10cm and where only p = 10 plankton species are considered,
(a) Carry out a principal component analysis of the p = 10 species, plotting component scores for the dominant component.
(b) Rotate the loadings and scores using the varimax rotation. Is there a change in the interpretation?
(c) Repeat parts a and h using a maximum likelihood factor model.
they are known as trend surface analyses-see, for example, Harbaugh and Demirmen (1964) and Cameron (1968).
Carry out the suitable hypothesis test, at alpha = .05, to find out whether there is a relationship between school/work and stress.
For 200 children with a test for E. histolytic, 59 had positive result and 151 had negative result. What is the probability of positivity for E. histolytic? Probability of negativity for E. histolytic was
Complete the ANOVA Summary Table and perform post hoc comparison if necessary
can we conclude that women think men are less kind, gentle, and thoughtful in the later survey compared with the earlier one? Hint: For the calculations, assume the latter survey as the first sample.
The hardness of a piece of ceramic is proportional to the ?ring time. Assume that a rating system has been devised to rate the hardness of a ceramic piece and that this measure of hardness is a random variable that is distributed uniformly between..
The heights of 18 year old men are approximately normally distributed with mean 68 inches and a SD of 3 inches.
Below is a normal plot of residuals from a regression. Does the plot indicate any problems with the assumption that the residuals are Normally distributed
kasandra associates provides executive coaching services to fortune 100 senior executives. her team charges 190 per
A soft drink bottling machine is set to dispense soft drink into containers labeled 16 ounces. While the actual quantities vary they are normally distributed with a mean of 16.1 ounces and a standard deviation of 0.015 ounces.
Are the following workers more likely to experience short-term or long-term unemployment? Explain.
Grades my justifiably be quantified in the usual manner
students of dr. psychicu2019s training class wanted to see if they do learn the skills at the end of the class. each
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