21. . . . . . . . . function carries out a chi-square test.
22. Which of the following adds marginal sums to an existing table?
23. Which of the following lists names of variables in a data.frame?
24. Which of the following is tool for chi-square distributions?
25. Which of the following groups values of a variable into larger bins?
26. Which of the following determine the least-squares regression line?
27. Which of the following is tool for checking normality?
28. Which of the following is lattice command for producing boxplots?
29. Which of the following compute analysis of variance table for fitted model?
30. Which of the following is used to find variance of all values?
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