# Question: Ferric chloride is used as a flux in some types

Ferric chloride is used as a flux in some types of extraction metallurgy processes. This material is shipped in containers, and the container weight varies. It is important to obtain an accurate estimate of mean container weight. Suppose that from long experience a reliable value for the standard deviation of flux container weight is determined to be 4 lb. How large a sample would be required to construct a 95% two-sided confidence interval on the mean that has a total width of 1 lb?

**View Solution:**## Answer to relevant Questions

The diameters of aluminum alloy rods produced on an extrusion machine are known to have a standard deviation of 0.0001 in. A random sample of 25 rods has an average diameter of 0.5046 in. (a) Test the hypothesis that mean ...Suppose that you are testing the following hypotheses where the variance is known: H0 : 100 H1 : 100 Find the P-value for the following values of the test statistic. (a) Z0 = 2.50 (b) Z0 = 1.95 (c) Z0 = ...The cooling system in a nuclear submarine consists of an assembly pipe through which a coolant is circulated. Specifications require that weld strength must meet or exceed 150 psi. (a) Suppose the designers decide to test ...An inspector counts the surface-finish defects in dishwashers. A random sample of five dishwashers contains three such defects. Is there reason to conclude that the mean occurrence rate of surface-finish defects per ...The tensile strength of a paper product is related to the amount of hardwood in the pulp. Ten samples are produced in the pilot plant, and the data obtained are shown in Table 4E.9. (a) Fit a linear regression model relating ...Post your question