Have a bit of a question for some stats I need to run for my research. Have already asked around the lab and no one's 100% sure.

1. I have the data for a single population of individuals including the mean and SD. I need to compare this to a paper that only lists the mean, SD and number of individuals. Is this a single sample or independent t-test (and can anyone suggest an accurate online calculator if it's an independant t-test as I think SPSS needs the background data for both to run.) Looking at the previous paper's analysis (where they've done a comparison against a previous year) I think it seems to be a single sample, but wouldn't you run an independent t-test if you know the mean, SD and n of each group? (Both lots of n are larger than 30 and are definitely independant.)

2. I have a separate lot of data I need to compare to the same paper, but this time they've only given me percentage values. (Example 73.2% light, 21.3% medium and 4.9% dark materials.) Again, the previous paper ran a chi squared test on their data, comparing to another location. If I need to compare my own data to these values, I'm guessing the best way would be to round the percentages into whole numbers then run a chi-square? (ie 73% light, 21% medium, 5% dark?) Also does it matter if the rounding does not add to 100 (ie due to rounding it causes the total to = 101 say?)

Thank you very much in advance.