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|The F test is appropriate in any experiment in which the scores can be used to form two independent estimates of the population variance. One quite frequent situation in the behavioral sciences for which the F test is appropriate occurs when analyzing the data from experiments that use more than two groups or conditions. The two-group study involves a control group and an experimental group. Although this design is still used frequently Wholesale Jerseys China Cheap , it is more common to encounter experiments that involve three or more groups. A major limitation of the two-group study is that often two groups are not sufficient to allow a clear interpretation of the findings. For example, the “thalamus and pain perception” experiment included two groups.
One received lesions in the thalamus and the other in an area “believed” to be unrelated to pain. The results showed a significantly higher pain threshold for the rats with thalamic lesions. Our conclusion was that lesions of the thalamus increased pain threshold. However, the difference between the two groups could just as well have been due to a lowering of pain threshold as a result of the other lesion rather than a rising of threshold because of the thalamic damage. This ambiguity could have been dispelled if three groups had been run rather than two. The third group would be a non-lesion control group. Comparing the pain threshold of the two lesion groups with the non-lesion group would help resolve the issue.
Another class of experiments requiring more than two groups involves experiments in which the independent variable is varied as a factor; that is, a predetermined range of the independent variable is selected, and several values spanning the range are used in the experiment. For example, in the “hormone X and sexual behavior” experiment, rather than arbitrarily picking one value of the hormone, the experimenter would probably pick several levels across the range of possible effective values. Each level would be administered to a different group of subjects Wholesale Authentic Jerseys , randomly sampled from the population. There would be as many groups in the experiment as there are levels of the hormone. This type of experiment has the advantage of allowing the experimenter to determine how the dependent variable changes with several different levels of the independent variable. In this example, the experimenter would find out how mating behavior varies in frequency with different levels of hormone X. Not only does using several levels allow a lawful relationship to emerge if one exists, but when the experimenter is unsure of what single level might be effective, using several levels increases the possibility of a positive result occurring from the experiment.
A major application in the field of biometrics that is gaining popularity nowadays tremendously is none other than face recognition time attendance system! The reason behind its huge popularity might be different like the cultural differences in a country but people are accepting this device, definitely for some or the other reason. It took long, to accept the device and relying on it just for the purpose of better authentication. However people somehow got convinced regarding its efficiency and thereby accepted the system in different premises.
Biometric Time Attendance, Something Extra!
Because of various advantages, face recognition time attendance system is being used at different premises to handle different situations. Popularly the time attendance system is greatly used in corporate for recoding the presence of the employees. In schools also Wholesale Jerseys Free Shipping , the biometric system is getting huge popularity in order to notify the higher authority about the attendance of the staffs. Apart from corporate and schools, time attendance system is even being used in hospitals to notify the timing details.
The biometric time attendance system is based on face recognition technology. The technology is the latest one and therefore provides the authentication by recognizing the facial details. During the enrollment process, the device captures the facial details of the individuals and then stores electronically inside the database of the computer. Next time when the person revisits the premise, the device again captures the facial patterns and matches with the stored patterns. If it finds the match then, the device notifies the timing details and thereby provides the authentication.
Since the biometric time attendance system supports 'no human touch' technology therefore, one can be free from the threat of buddy punching. Since the system is based on recognizing the facial details of individuals therefore, this increases the efficiency of the face recognition attendance device.
Time Attendance to Manage the HRMS:
Other than just notifying the timing details of the employees the face recognition time attendance system actively participates in the human resource management system. It helps in various other areas like:
The biometric time attendance system notifies the log in and the log out timings of the employees. The work that used to be done using pen and paper, nowadays it has been substituted by the face recognition attendance system. Since the timing details are now notified using the electronic device Wholesale Jerseys For Cheap , accuracy is being achieved to the maximum.
锟?Human Resource Management System (HRMS):
The timing details captured by the face recognition time attendance system is used by the HR department for the generation of payroll. The accuracy in the timing data helps in generating flawless payroll, which helps in saving large amount of time since, everything is done automatically.
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