Question

1)
Express the confidence interval (25.6%,38.6%)(25.6%,38.6%) in the form of ˆp±ME
____ % ± ___ %

2)

In a recent poll, 390 people were asked if they liked dogs, and 37% said they did. Find the margin of error of this poll, at the 90% confidence level.

Give your answer to three decimals

3) You measure 29 watermelons' weights, and find they have a mean weight of 66 ounces. Assume the population standard deviation is 5.9 ounces. Based on this, what is the maximal margin of error associated with a 90% confidence interval for the true population mean watermelon weight.

Give your answer as a decimal, to two places

± ____ ounces

4)

In a survey, 31 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $37 and standard deviation of $8. Find the margin of error at a 98% confidence level.

Give your answer to two decimal places.

5) For a confidence level of 95% with a sample size of 21, find the critical t value.
Round your answer to 3 decimal places.

Answer 1