Chapter 9.3, Problem 84E

To determine

To check: Whether there is sufficient evidence to conclude that claim of blogger is incorrect at 10% significance level.

Answer to Problem 84E

Yes, there is sufficient evidence to conclude that claim of blogger is incorrect at 5% significance level.

Explanation of Solution

Given:

The output is:

Calculation:

From the above output, the 95% confidence interval is $\left(3.794,4.615\right)$ . It means that there are 90% chances that average intake of water is between 3.794 and 4.615. Here, 5 does not lie in the computed confidence interval. Thus, there is sufficient evidence to conclude that claim of site is incorrect at 5% significance level.