Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.

Please verify your account before proceeding.

In this lesson, we will learn how to calculate 90%, 95%, and 99% confidence intervals for the population means.

Q1:

The weights of packets of chips are known to be distributed with a variance of 2.56 grams. A sample of 100 packs were tested and the mean weight was 24.1 grams.

Calculate a 9 9 % confidence interval for the population mean π .

Q2:

The number of hours students spend on homework each week is known to be distributed with a standard deviation of 3.21 hours. A sample of 50 students were asked how many hours they spend doing homework in a week and the results are given in the table.

Find the sample mean.

Calculate a 9 5 % confidence interval for the population mean.

Q3:

A sample of the heights of π people from a population resulted in a sample mean of π₯ meters. Given that the standard deviation, π , is known, which of the following represents a 9 0 % confidence interval for the population mean?

Donβt have an account? Sign Up