# Question

The following are the drying times (minutes) of 40 sheets coated with polyurethane under two different ambient conditions.

Use a suitable statistical computer program to test whether there is a significant difference between the mean drying times under the two ambient conditions. Use the 0.05 level of significance.

Use a suitable statistical computer program to test whether there is a significant difference between the mean drying times under the two ambient conditions. Use the 0.05 level of significance.

## Answer to relevant Questions

Samples of three materials under consideration for the housing of machinery on a seagoing vessel are tested by means of a salt-spray test. Any sample that leaks when subject to a power spray is considered to have failed. The ...Using the data of Exercise 14.99, In exercise (a) Create a new variable, x22. (b) Fit a surface of the form (c) Find the correlation matrix of the three independent variables. Is there evidence of multicollinearity? (d) ...The method of least squares can be used to fit curves to data. Using the method of least squares, find the normal equations that provide least squares estimates of a, β, and γ when fitting a quadratic curve of the form y = ...Use the results of Exercises 14.20 and 14.21 and the fact that E(Bˆ) = β and var(Bˆ) = σ2/ Sxx to show that Yˆ0 = Aˆ + Bˆ is a random variable having a normal distribution with the mean And the variance Also, use the ...In a random sample of n pairs of values of X and Y, (xi, yj) occurs fij times for i = 1, 2, . . . , r and j = 1, 2, . . . , c. Letting fi, denote the number of pairs where X takes on the value xi and fj the number of pairs ...Post your question

0