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Name:
Lab Problems 3-
Statistics 0200 Fall 2008 Dr. Nancy Pfenning
- (5 pts.) Does living on or off campus depend at all on whether a surveyed student is male or female?
(a) What variable or variables are involved? For each variable, tell whether it is quan- titative or categorical. Which variable (if any) should play the role of explanatory
variable?
(b) Before you even look at the data, do you expect the variables to be dependent? If so, for which explanatory group do you expect to see a higher proportion living on campus?
(c) Use MINITAB Basics Example U to produce a two-way table of counts and row percents. Does one group have a considerably higher proportion on campus?
(d) Summarize your findings in one or two sentences. Be sure to express your results specifically in terms of the variable(s) of interest, and mention to what extent the results match your guesses in (b).
- (5 pts.) How are surveyed students’ heights and weights related?
(a) What variable or variables are involved? For each variable, tell whether it is quantitative or categorical.
Which, if any, would be the obvious choice for explanatory variable? (b) Before you even look at the data, try to make a reasonable guess for each of the following: [If you’re completely clueless, just answer with a “?”.] i. form (linear or curved): ii. direction (positive, negative, or none): iii. strength (strong, moderate, or weak): Do you expect outliers? (Explain briefly.)
(c) Use MINITAB Basics Example Q (only the relevant parts) to answer the following: Does the scatterplot show a roughly linear form? What is the regression line equation? What is the value of the correlation r? What is the typical residual size s? (d) Summarize your findings in one or two sentences. Be sure to express your results specifically in terms of the variable(s) of interest, and mention to what extent the results match your guesses in (b).
