1) A researcher is investigating how companies use the postal service to dispense advertising and promotional information. A random sample of 49 households was selected and each household was asked how many pieces of advertising and promotional material it received within the past week. The mean of the sample was 15.9, and the sample standard deviation was 4.8. What is the best point estimate for the mean amount of pieces of advertising and promotional material all households receive in a week? Write the answer using the appropriate rounding rule.

2) In a sample of 600 potential car buyers, 376 indicated that they would consider purchasing a hybrid gas/electric-powered car. What is the best point estimate of the proportion of all potential car buyers that would consider purchasing a hybrid gas/electric-powered car? Write the answer as a decimal using the appropriate rounding rules.

3)

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