Mathematics

Mathematics, 02.07.2019 01:30, travis770

Arandom sample is also called an unbiased sample. true or false

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Mathematics, 02.08.2019 23:20, lupitasgirl3326

Abiologist is studying the effects that applying insecticide to a fruit farm has on the local bat population. she collects 23 bats and finds the mean weight of this sample to be 503.4 grams. assuming the selected bats are a random sample, she concludes that because the sample mean is an unbiased estimator of the population mean, the mean weight of bats in the population is also 503.4 grams. explain why this is an incorrect interpretation of an unbiased estimator. a. having an unbiased estimator means that the mean of the means of all possible samples of the same size would be the same as the population mean. b. having an unbiased estimator means that the sample mean will not be equal to the population mean. c. having an unbiased estimator means that at least two sample means are the same as the population mean. d. having an unbiased estimator means that none of the sample means will be equal to the population mean.

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Social Studies, 18.10.2019 13:50, zasxdcfvg5868

Arandom sample of people is chosen to participate in a survey. for the survey results to be considered valid, which must be true of the random sample? the sample must be the same size as the population. the sample must represent the target population. the sample must be biased. the sample must be a group separate from the population.

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Mathematics, 04.11.2019 23:31, gilaarkalji

Identify the sample as biased or unbiased and describe its type. to determine whether students would choose engineering as their profession, equal number of boys and girls were surveyed in a school. a. unbiased, stratified random sample b. unbiased, systematic random sample c. biased, convenience sample d. biased, voluntary response sample

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Mathematics, 05.11.2019 00:31, de5briz75

Identify the sample as biased or unbiased and describe its type. john wanted to know about the popularity of a particular movie. he surveyed 20% of the people in 5 different theaters. a. biased, voluntary response sample b. biased, convenience sample c. unbiased, simple random sample d. unbiased, systematic random sample

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