Sampling Methods

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What is a scatterplot?

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A scatterplot is a graphical representation of two variables where each point represents an observation. It helps to visualize the relationship between the variables.

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What does a downward slope in a scatterplot indicate?

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A downward slope from left to right in a scatterplot indicates a negative correlation between the two variables.

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What is a correlation coefficient?

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A correlation coefficient is a statistical measure that describes the strength and direction of a relationship between two variables, ranging from -1 to 1.

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What does a correlation coefficient of -0.9 signify?

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A correlation coefficient of -0.9 indicates a strong negative relationship between two variables.

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What is systematic random sampling?

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Systematic random sampling is a method where you select every nth individual from a list or sequence, ensuring a random starting point.

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What is random sampling?

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Random sampling is a technique where each individual in a population has an equal chance of being selected, ensuring that the sample is representative.

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How can you determine the average time spent on homework using a sample?

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You can determine the average by collecting data from a representative sample of students and calculating the mean of their reported homework times.

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What is the purpose of using a random-number table in sampling?

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A random-number table is used to ensure that the selection of samples is random, reducing bias in the sampling process.

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What is the difference between random sampling and systematic sampling?

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Random sampling gives each individual an equal chance of selection, while systematic sampling selects individuals at regular intervals from a list.

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What is the significance of sample size in research?

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Sample size affects the reliability and validity of the results; larger samples tend to provide more accurate estimates of the population parameters.