1) According to a study conducted by Dell Computers, 65% of men and 70% of women say that weight is a very important factor in purchasing a laptop computer. Suppose this survey was conducted using 374 men and 481 women. Do these data show enough evidence to support the conclusion that there is no difference in the proportion of men and women who think weight is a factor in purchasing a laptop? Use a 5% level of significance.
2) In a study of annual salaries of employees, random samples were selected from two companies to see if there is a difference in their average annual salaries. For Company "A" the sample size was 72, the sample mean was $48,000 and the sample standard deviation was $12,000. For Company "B" the sample size was 50, the sample mean was $43,000 and the sample standard deviation was $10,000. Test for a significant difference in salaries at a 5% level of significance. What is your conclusion?