1.) a regression analysis, ifr= 0, then _______________.

a.the relationship between variables is negative

b.the relationship between variables is normal

c.there is no linear relationship between variables

d.the relationship between variables is perfect

2.) The single most important influence on the choice of the mean or the median for summarizing the central tendency of quantitative variables is _____________.

a.the purpose of the statistical summary

b.the ease with which the calculations can be made

c.whether there are more than 100 statistical data points

d.if there is a normal distribution of the variables