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. A.Find a 99% confidence interval estimate for the true proportion of bulbs functioning according to specifications. B.How large a sample should be taken in order to estimate the proportion to within 2%, with 99% confidence?

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