# Quiz3 - Quiz(WK3 All possible samples of size n are...

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Quiz (WK3) 1. All possible samples of size n are selected from a population and the mean of each sample is determined. What is the mean of the sample means? (Points : 1) Exactly the same as the population mean Larger than the population mean Smaller than the population mean Cannot be estimated in advance 2. When dividing a population into subgroups so that a random sample from each subgroup can be collected, what type of sampling is used? (Points : 1) simple random sampling systematic sampling stratified random sampling cluster sampling 3. An accounting firm is planning for the next tax preparation season. From last year's returns, the firm collects a systematic random sample of 100 filings. The 100 filings showed an average preparation time of 90 minutes with a standard deviation of 140 minutes. What is the standard error of the mean? (Points : 1) 14 minutes 140 minutes 1.4 minutes 90 minutes 4. Manufacturers were subdivided into groups by volume of sales. Those with more than \$100 million in sales were classified as Class A large; those from \$50 to \$100 million as Class A medium size; and those between \$25 and \$50 million, and so on. Samples were then selected from each of these groups. What is this type of sampling called? (Points : 1) Simple random Stratified random Cluster Systematic

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5. A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time students spend studying per week.
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Quiz3 - Quiz(WK3 All possible samples of size n are...

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