Some of the answers were wrong. Numbers 25, 26, 29, 30, 31 and 38 were corrected wrong. From 29-31 it requires the actual number.

Hi, I was helped before with my statistics assignment. Some of the answers were wrong. Numbers 25, 26, 29, 30, 31 and 38 were corrected wrong. From 29-31 it requires the actual number. Can you take another look at why it was wrong? 

Also this additional question about which sampling method is being used:

A researcher assigns each student at a major university a number. She elects the sample by randomly choosing one of the first 25 numbers and then every 32nd number thereafter. What sampling method was being used?

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