1. A market survey was conducted by Marketing and Business Consultancy Limited to estimate the proportion of homemakers who could

recognize the brand name of a cleanser based on the shape and colour of the container. In a random sample of 1400 homemakers, 420

were able to recognize the brand name.

Using the 0.98 degree of confidence, within what interval does the proportion of all homemakers who are able to recognize the brand name

lie?

2. Given the following data on advertising and sales. Find the value of the coefficient of correlation (r).

Advertising	Sales
10	50
20	70
30	70
40	80
50	100
60	105
70	103