UPDATED ECO 251CLT TEST SOLUTIONS QUESTIONS AND CORRECT ANSWERS

Sampling without replacement means that once a member of a population is chosen for a sample, it cannot be chosen again for the same sample. - ANSWER TRUE Cluster sampling is often used to test market new products. - ANSWER TRUE A convenience sample is an example of a nonprobability sample. - ANSWER TRUE An Internet poll, where individuals may respond to a survey as many times as they choose to, is an example of a nonprobability sample. - ANSWER TRUE A population mean is an example of a statistic. - ANSWER FALSE A sample median is an example of a statistic. - ANSWER TRUE Sampling error is the difference between a sample statistic and a population parameter. - ANSWER TRUE A small sample size could provide a smaller sampling error than a larger sample size when taken from the same population. - ANSWER TRUE A common source of nonsampling errors is a survey that contains ambiguous questions in the eyes of the respondent. - ANSWER TRUE We expect the average value of many sample means to be close to the population mean from which they were drawn. - ANSWER TRUE The standard error of the mean is the sample mean standard deviation, which measures the variation around the mean of the sample means. - ANSWER TRUE The sample means for a population that follows the normal distribution will also be normally distributed, regardless of the size of the samples. - ANSWER TRUE The sampling error for a census equals zero. - ANSWER TRUE The sampling distribution of the proportion describes the pattern that sample proportions tend to take on when randomly drawn from a population. - ANSWER TRUE A sample is a sample in which each member of the population has a known, nonzero, chance of being selected for the sample. A) systematic B) simple random C) probability D) convenience - ANSWER C) probability A sample is a sample in which every member of the population has an equal chance of being chosen. A) systematic B) simple random C) probability D) stratified - ANSWER B) simple random In sampling, we divide the population into mutually exclusive groups and randomly sample from each of these groups. A) stratified B) cluster C) probability D) simple random - ANSWER A) stratified The statistical technique where many samples are repeatedly drawn from a population is known as . A) convenience sampling B) nonprobability sampling C) resampling D) probability sampling - ANSWER C) resampling A sample is used when members of the population are chosen to become part of the sample simply because they are easily accessible. A) cluster B) convenience