Question

1-Assume that a sample is used to estimate a population mean μ . Find the 99% confidence interval for a sample of size 1088 with a mean of 84.1 and a standard deviation of 10.7. Enter your answer accurate to one decimal place (because the sample statistics are reported accurate to one decimal place).

< μ <

2- Assume that a sample is used to estimate a population mean μμ. Find the 90% confidence interval for a sample of size 345 with a mean of 64.6 and a standard deviation of 10.2. Enter your answer accurate to one decimal place (because the sample statistics are reported accurate to one decimal place).
<μ<

3-

In a survey, 22 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $39 and standard deviation of $2. Find the margin of error at a 90% confidence level.

Give your answer to two decimal places.

3- If n=20, ¯xx¯(x-bar)=37, and s=3, find the margin of error at a 90% confidence level

Give your answer to two decimal places.

4-64% of 44 delegates in a policitcal convention favored changing the rules to restrict the number of potential candidates. What is the 95% confidence interval for the population proportion.

Give your answers as decimals, to two places.

< p<

Answer 1