validity of data

A biased sampling is ____

• where the method may cause a misleading conclusion about the population

• where every member of the population is equally likely

A sample of size n from a population of size N by selecting every kth member where k = N/n to the nearest whole number. Select all suitable responses.

• random sampling

• biased sampling

• systematic sampling

• stratified sampling

Test results in the past were affected by gender. There are 60% female students and 40% male students. There are 70% students came from local schools and 30% came from international schools. Choose all suitable responses. The data collection should be ___

• systematic sampling

• quota sampling

• 60% of total sample should be female students

• 70% of total sample should come from local schools

Which of these are not random sampling? Select all suitable responses.

• stratified sampling

• quota sampling

• systematic sampling

• convenience sampling

A weighing machine overweights every item by 2 grams. Choose all suitable responses.

• random error

• systematic error

• this leads to misleading conclusion

Advantages of questionnaires are

• They can be easily distributed

• Each person receives the same questions.

• Suitable for questions that require True or False responses.

• People may not answer honestly.

Disadvantages of questionnaires are ___

• Answers are restrictive to choices given and does not reflect reality.

• People may not response honestly.

• Unstructured questions may have different responses making analysis difficult.

• Complete questionnaires can be lengthy and people may refuse to response.

X occurs when lots of pairs of variables are considered to see if any significant results can be found. What is X?

• Random sampling

• Data Mining

• Systematic sampling

Students had learned to solve quadratic equations. They were given a test on quadratic equations. The test has ___

• criterion validity

• predictive validity

• content validity

Test-retest and parallel forms are examples of ___

• validity test

• realibility test