Download the monthly Adjusted Closing Price for Target Corp. $($Ticker$=$TGT$)$ and SPDR S&P $500$ ETF Trust $($ticker $=$ SPY$)$ from Yahoo website from January $1,2014$ to December $31,2018.$

Compute the following:

Average monthly return for TGT and SPY

Variance of returns for TGT and SPY

Standard deviation of returns for TGT and SPY