Forecasting & Scatter Diagrams

I need help with these questions:

An advantage of exponential smoothing over a simple moving average is that exponential smoothing requires one to retain less data.
True
False

Which of the following statements about scatter diagrams is true?
Time is always plotted on the Y axis.
It can depict the relationship among three variables simultaneously.
It is helpful when forecasting with qualitative data.
The variable to be forecasted is placed on the Y axis.
It is not a good tool for understanding time-series data.

In the exponential smoothing forecasting method, a is the
slope of the trend line.
new forecast.
Y-axis intercept.
independent variable.
trend smoothing constant.

Which of the following is not a characteristic of trend projections?
The variable being predicted is the Y variable.
Time is the X variable.
It is useful for predicting the value of one variable based on time trend.
It is helpful for determining if time is causing the dependent variable.
none of the above

Which of the following statements is true regarding a scatter diagram?
It provides very little information about the relationship between the regression variables.
It is a plot of the independent and dependent variables.
It is a line chart of the independent and dependent variables.
It has a value between -1 and +1.
It gives the percent of variation in the dependent variable that is explained by the independent variable.