Please help me with a Finance problem.

I am asked to investigate Fisher & Paykel Healthcare (FPH.NZ) on Yahoo Finance and collect daily stock prices from 20.3.19-20.3.20. I am to put the data (closing prices) into excel and put this into a regression analysis. I am then asked to collect daily stock market index for the same period and to determine the appropriate stock market index.

What is meant by the stock market index? Is it the NZX50? FPH has been trading at around $30 per share lately, but NZX50 is based on points (about 10,000). I am unsure if the question means to put the 2 pieces of data together and put this into a regression? Please help me and tell me what you think the question is asking. Thanks.