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1. A survey of 95 families showed that 40 of the families owned at least one tv. a)Suppose you reduce your level of confidence to 90%. Will this
1. A survey of 95 families showed that 40 of the families owned at least one tv.
a)Suppose you reduce your level of confidence to 90%. Will this create a wider or narrower interval? Does this mean that precision will increase or decrease?
2.A survey of shoppers is planned to see what percentage use credit cards. Prior surveys suggest 53% of shoppers use credit cards. How many randomly selected shoppers must we survey in order to estimate the proportion of shoppers who use credit cards to within 3% with 95% confidence?
