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Sampling

Class 9 Science के इस tag से जुड़े questions। हर question के साथ chapter, topic, level और difficulty दी गई है।

ScienceA student tests the effect of soil moisture on earthworm number. If all samples are collected only after rainfall which external variable remains poorly controlled?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceWhich sampling method would give the least biased conclusion about the sleeping habits of all students in a school?Class 9Exploration: Entering the World of Secondary ScienceHypothesis and experimentationExpert ScienceA student records results only for the three fastest germinating seeds. What type of bias is this?Class 9Exploration: Entering the World of Secondary ScienceHypothesis and experimentationExpert ScienceWhat should be checked before applying an experimental conclusion from a sample to an entire population?Class 9Exploration: Entering the World of Secondary ScienceHypothesis and experimentationHard ScienceA student counted birds on only one day and drew a conclusion for the whole year. What is the main problem?Class 9Exploration: Entering the World of Secondary ScienceScientific questions and observationsExpert ScienceA student selects only plants that are already tall and then tests a fertiliser. What problem does this create?Class 9Exploration: Entering the World of Secondary ScienceScientific questions and observationsHard ScienceA survey collected responses only from internet users but applied the conclusion to the entire population. What is the problem?Class 9Exploration: Entering the World of Secondary ScienceNature and meaning of scienceExpert ScienceA scientific conclusion claims an effect applies to all humans although the study involved only healthy adults. What problem does this illustrate?Class 9Exploration: Entering the World of Secondary ScienceNature and meaning of scienceExpert ScienceA survey included only people who volunteered to respond. Which bias may occur?Class 9Exploration: Entering the World of Secondary ScienceNature and meaning of scienceHard ScienceA study sampled students from only one school. What is the problem with applying its conclusion to students across the country?Class 9Exploration: Entering the World of Secondary ScienceNature and meaning of scienceHard ScienceWhat does sampling mean in a scientific investigation?Class 9Exploration: Entering the World of Secondary ScienceNature and meaning of scienceEasy