samplequiz6 - Stat 119 Sample quiz, chapter 19, 20 Name_...

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Stat 119 Name____________________________ Sample quiz, chapter 19, 20 Red id: __________________________ Use the following to answer problems 1-3 Manufacturers of photographic equipment have introduced many new easy-to-use cameras, film types and flash equipment in recent years. A new type of flashbulb was tested to estimate the proportion of new bulbs that would produce the required light output at the appropriate time. A sample of 1000 bulbs was tested and 920 were observed to function according to specifications. 1. Find a 99% confidence interval estimate for the true proportion of bulbs functioning according to specifications. Answer: 2. How large a sample should be taken in order to estimate the proportion to within 2%, with 99% confidence? Answer: 3. If we calculate a 95% confidence interval instead of a 99% confidence interval, then: a) The width of the confidence interval would be unchanged. b)
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samplequiz6 - Stat 119 Sample quiz, chapter 19, 20 Name_...

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