Concept explainers
Refer to Data Set VALID.DAT (at www.cengagebrain.com) described in Table 2.16 (p. 38).
Answer Problem 5.59 using the ln(nutrient) transformation for each nutrient value. Is the normality assumption more appropriate for log-transformed or untransformed values, or neither?
Consider the nutrients saturated fat, total fat, and total calories. Plot the distribution of each nutrient for both the diet record and the food-frequency questionnaire. Do you think a
(Hint: Compute the observed proportion of women who fall within 1.0, 1.5, 2.0, and 2.5 standard deviations of the mean. Compare the observed proportions with the expected proportions based on the assumption of normality.)
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Fundamentals of Biostatistics
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- Find the equation of the regression line for the following data set. x 1 2 3 y 0 3 4arrow_forwardTable 6 shows the population, in thousands, of harbor seals in the Wadden Sea over the years 1997 to 2012. a. Let x represent time in years starting with x=0 for the year 1997. Let y represent the number of seals in thousands. Use logistic regression to fit a model to these data. b. Use the model to predict the seal population for the year 2020. c. To the nearest whole number, what is the limiting value of this model?arrow_forward
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