Consider the following time series data of sales per year: year sales 1995 22.2 1996 23.0 1997 24.4 1998 25.8 1999 27.6 enter these data in excel and run the following regression: sales = intercept + slope * year note that the year is the independent variable and sales is the dependent variable. develop a two tail test for the theory that the slope of the regression line is different from zero.

there is no universally accepted definition of art. although commonly used to describe something of beauty, or a skill which produces an aesthetic result, there is no clear line in principle between (say) a unique piece of handmade sculpture, and a mass-produced but visually attractive item. we might say that art requires thought - some kind of creative impulse - but this raises more questions: for example, how much thought is required? if someone flings paint at a canvas, hoping by this action to create a work of art, does the result automatically constitute art?

the today function returns a valid value without any arguments.

the today function returns the current date based on the computer's date setting and formatted as a date. today takes no parameters, but requires that you use empty parentheses