Here are some numbers that you can use to sharpen your computational skills for sample size determination. Crest Toothpaste is reviewing plans for its annual survey of toothpaste purchasers. With each case that follows, calculate the sample size pertaining to the key variable under consideration. Where information is missing, provide reasonable assumptions.
Answer to relevant QuestionsThe following items pertain to determining sample size when a mean is involved. Calculate the sample size for each case. When calculating sample size, how can a researcher decide on the level of accuracy to use? What about level of confidence? What about variability with a percentage? For each of the following possible sample sizes listed, calculate the associated expected cost of the panel sample and the sample error: 1. 20,000 2. 10,000 3. 5,000 4. 2,500 5. 1,000 6. 500 Because we cannot easily calculate nonsampling errors, how must the prudent researcher handle nonsampling error? In a survey on magazine subscriptions, respondents write in the number of magazines they subscribe to regularly. What measures of central tendency can be used? Which is the most appropriate and why?
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