All Free Statistics MCQs with Answers
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545 questions · page 54 of 55
531. To purchase the fruit, we use the _________ sampling?
- A. Systematic
- B. Cluster
- C. Stratified
- D. Judgment
Explanation: Judgment sampling selects items based on the investigator's or purchaser's assessment rather than by a random mechanism. Choosing fruit based on visible quality is a typical judgment-sampling situation.
Correct answer: Judgment532. Non-random sampling is also called___________________?
- A. Biased sampling
- B. Non-prob.sampling
- C. Less than sampling
- D. Representative sampling
Explanation: Non-random sampling does not give every population unit a known or equal chance of selection, so it is commonly called non-probability sampling. It may also introduce selection bias, but option b is the standard name.
Correct answer: Non-prob.sampling533. A sampling distribution is the probability distribution for which one of the following___________?
- A. A sample
- B. A sample statistic
- C. A population
- D. A population parameter
Explanation: A sampling distribution describes how a statistic, such as a sample mean or proportion, varies across all possible samples from a population. It is not the distribution of one particular sample or of the population parameter itself.
Correct answer: A sample statistic534. Random samples of size 17 are from a population that has 200 elements, a mean of 36, and a standard deviation of 8. which of the following best describes the from of the sampling distribution of the sample mean for this situation ?
- A. Approximately normal because the sample size is small relative to the population size
- B. Approximately normal because of the central limit theorem
- C. Exactly
- D. None of these alternatives is correct
Explanation: With a sample size of only 17, the central limit theorem alone cannot ensure an approximately normal sample-mean distribution, because no population shape is specified. It is not necessarily exact normal, so none of the listed alternatives is correct.
Correct answer: None of these alternatives is correct535. The difference between statistics and parameter is called:______________?
- A. Bias
- B. Standard
- C. Sampling error
- D. both (a) and (b)
Explanation: Sampling error is the difference between a sample statistic and the corresponding population parameter. Bias is a systematic tendency of an estimator to miss the parameter, not the general difference itself.
Correct answer: Sampling error536. Standard deviation of the sampling distribution of a statistics is called_____________?
- A. Serious error
- B. Dispersion
- C. Standard error
- D. Difference
Explanation: The standard deviation of a statistic's sampling distribution is called its standard error. It measures the typical sampling-to-sampling variation of the statistic.
Correct answer: Standard error537. In probability sampling each sampling unit has some____________________?
- A. Unknown
- B. Large
- C. Small
- D. Know
Explanation: In probability sampling, every sampling unit has a known, nonzero probability of selection. This known probability distinguishes probability sampling from non-probability sampling.
Correct answer: Know538. There are ____________ probability sampling?
- A. Four
- B. Six
- C. Three
- D. Seven
Explanation: The four commonly taught probability sampling methods are simple random, stratified, systematic, and cluster sampling. Therefore, the number is four.
Correct answer: Four539. The smallest individuals which constitute the entire population are called __________________?
- A. Sampling frame
- B. Sampling units
- C. Sample pop
- D. Sample design
Explanation: A sampling unit is the smallest identifiable member or group of members selected in a sample, such as a person, household, or institution. A sampling frame is the list from which those units are selected.
Correct answer: Sampling units540. In the sampling without replacement a sampling unit can be selected_______________?
- A. Only Once
- B. More than once
- C. Less than once
- D. None of these
Explanation: In sampling without replacement, a selected unit is removed from further consideration, so it cannot be selected again. Hence each unit can be selected only once.
Correct answer: Only Once