Comparing a sample with a mean

I'm supposed to compare the increase in Oslo Stock Exchange with the increase in shares that were recommended at least 12 times. The increase in the OSE index was 30,9 % for the period. A total of 30 shares were recommended at least 12 times.

So on one hand, I have a sample consisting of 30 observations. On the other hand, I only have a single number, the mean.

What methods, tests etc. should I use for the comparison?


New Member
If I understand you correctly you are supposed to compare two means. One is the mean return that "the market" earned. The other is the mean return of the portfolio of recommended stocks. Do a search on "difference in means" on Google. There should be plenty tutorials on how to do this.