Direct access means going straight to the record you want,and random access means pick data randomly and then find that data which you required.
http://wiki.answers.com/Difference_between_direct_and_sequential_access#ixzz1685bfqda
Random variables is a function that can produce outcomes with different probability and random variates is the particular outcome of a random variable.
Biased- (Not random) Unbiased-(Random) Example: (ubbiased) Woman takes random people to take a survey.
random sample is a big sample and convenience sample is small sample
Random sampling is picking a subject at random. Systematic sampling is using a pattern to pick subjects, I.e. picking every third person.
Random sampling is the sample group of subjects that are selected by chance, without bias. Random assignment is when each subject of the sample has an equal chance of being in either the experimental or control group of an experiment.
Difference between direct access and random access
The common techniques of file processing include sequential access, random access, and direct access. Sequential access involves reading data sequentially from the beginning to the end of a file. Random access allows reading data from any part of the file without having to read the preceding data. Direct access uses a key or address to locate specific data within the file.
sd ram is synchronous dynamic random access memory, ram is just random access memory
Let's say you have a set of 100 pieces of data, which are all names. Now, if you want to find a specific name, "Kevin", you can find it in different ways. You could either go through each of the records one after another, or you could randomly generate a number, and check if that record is "Kevin", this is potentially faster than sequential access as "Kevin" could be the last record.
RAM or Random Access Memory is used for fast computer memory. The word "Random" is a bit of a misnomer, as there is nothing random about access to this memory. What it actually means is that you can select an address at "random", that is, any address within the capability of the memory, and read or write data to/from that address just as fast as you could read or write data to any other address. In other words, data stored anywhere in the memory can be accessed quickly. Serial memory is different in that access time depends upon where on the medium the data is stored. Examples are magnetic tape, optical disk, magnetic disk. "arbitary access" is not a term used in electronics that I can find. I think it is just another term for "random access".
Spam is unsolicited to random addresses.
random access memory
, Both terms "direct access" and "sequential access" as you must have guessed refer to accessing schemes in the file system. In broadest sense difference between these two can be stated like this -In sequential access data is stored at random locations. -In direct access data is stored at sequential locations. ( Ironically this is true No matter what kind of first impression we get when we hear it for the first time. ) -In sequential access addition of data is fast but retrieval of data is slow. -In direct access addition of data is slow as reordering of data blocks may be needed to put current data block after the last used data block for the file. But retrieval of data is fast. -Data structure implementing Sequential access is linked list. -Data structure implementing Direct access is an Array. Application areas:- A situation where rate of addition of data is much larger compared to retrieval of data Sequential access is preferred, in opposite situation Direct access is more suitable. Regards, Prime There are technical explanations as to how it works, but in simple terms, direct access means going straight to the record you want, whereas sequential access means going through all records one by one until you find the one you want.
ROM is volatile
SD ram is synchronized with the with the system clock and runs at the same speed as your computer. DDR2 is random access memory that is used for high speed storage of the working data of a computer.
Magnetoresistive Random Access Memory
Random access memory.