Question

Calculate PART A PART B PART C:

PART A:   You measure 20 backpacks' weights, and find they have a mean weight of 76 ounces. Assume the population standard deviation is 12.3 ounces. Based on this, determine the point estimate and margin of error for a 99% confidence interval for the true population mean backpack weight.

Give your answers as decimals, to two places

±±  ounces

PART B:

Assume that a sample is used to estimate a population mean μμ. Find the 99.5% confidence interval for a sample of size 725 with a mean of 66.7 and a standard deviation of 9.3. Enter your answer accurate to one decimal place (because the sample statistics are reported accurate to one decimal place).

< μμ <

PART C:   

You intend to estimate a population mean μμ from the following sample.

20.9	-5.4	10.4	22.5
12.2	20.6	37.6	5.4
8.6	30.3	18.6	7.3
10.3	18.4	21.7	4.7
23.8	13.7	30	13.8
8.4	6.1

Find the 99.9% confidence interval. Enter your answer accurate to two decimal place (because the sample data are reported accurate to one decimal place).

< μμ <

Answer 1