Statistics Practice

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What is a simple random sample?

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A simple random sample is a subset of a population in which each member has an equal chance of being selected. This method helps ensure that the sample is representative of the entire population.

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What does it mean if a survey is representative?

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A survey is representative if the sample accurately reflects the characteristics of the larger population, allowing for valid inferences to be made.

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How do you calculate the predicted number of students wearing watches based on a sample?

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To predict the number of students wearing watches, use the proportion from the sample. For example, if 9 out of 40 students wear watches, the prediction for 120 students is (9/40) * 120 = 27.

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What is the median in a data set?

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The median is the middle value when a data set is ordered from least to greatest. If there is an even number of observations, the median is the average of the two middle numbers.

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What is the purpose of conducting a survey?

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The purpose of conducting a survey is to gather information or opinions from a group of people to understand trends, preferences, or behaviors.

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What is an inference in statistics?

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An inference is a conclusion drawn about a population based on the analysis of a sample from that population.

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What is the difference between a population and a sample?

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A population includes all members of a specified group, while a sample is a subset of the population selected for analysis.

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What is a systematic sample?

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A systematic sample is a method of selecting members from a population at regular intervals, such as every nth individual.

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What does it mean if a ride is the most popular based on survey results?

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If a ride is the most popular, it means that more than half of the surveyed individuals chose it as their favorite, indicating a strong preference among the sample.

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How can you determine the least popular option from survey data?

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The least popular option can be determined by identifying which choice received the fewest votes or selections in the survey results.