Question

1. Suppose you were asked to analyze each of the situations described below. (NOTE: Do not answer these problems!) For each, indicate which procedure you would use (pick the appropriate number from the list), the test statistic (z.2 or ), and the number of degrees of freedom A procedure may be used more than once. 1. difference of proportions test Type zx/t? df 2. difference of means test a. 3. paired means test 4. goodness of fit test 5. homogeneity/independence test 6. regression slope test 7. multiple regression analysis b. d. e. f. g. h. facturer is experimenting with a new 50-mm diameter screw-type container a. A manu using four amounts of torque (in inch-pounds) for closure. The tightness of the containers is tested based on two moisture permeability levels (less or more than 2000 water parts per million). From the data reported, is there any significant difference in moisture level based on the torque used to tighten the cap? For many cities around the world, garbage is an increasing problem. Many North American cities have virtually run out of space to dump the garbage. A consultant for a large American city decided to gather data about the problem in order to describe and predict its own need for garbage disposal space. She took a random sample of houses and determined the amount of garbage per week, the house size, the number of children, and the number of adults in residence. She wishes to determine the reliability of her model b.

Answer 1

a) In this case we used difference of proportion test. We used Z-test of two sample proportions.

b) Here we have top predict garbage disposal space over given some predictors like amount of garbage per week, the house size, the number of children and the number of adults in residence.

Hence we use multiple regression analysis to predict garbage disposal space.