1. A construction company employs electricians, carpenters, plumbers, bricklayers, roofers and general labourers. A committee of employees will be chosen to study a new profit sharing plan. What is the most appropriate technique for sampling to proportionally represent all employees?

A. voluntary and convenience B. stratified C. convenience D. voluntary

1. Four municipalities share in the administration of an airport. The populations are 45 000, 19 000, 14 000 and 6000. If the airport commission consists of a satisfied sample pf the municipalities with a total of 12 members, how many members should the smallest municipality contribute?

A. 1 B. 2 C. 3 D. 6

1. Which survey question contains bias?

A. Would you use a public swimming pool if one was built? B. Would you vote for building a skateboard park in town? C. Would you agree to pay higher municipal taxes? D. Would you try a new flavour of ice cream?

1. Dale looked up runs batted in (RBI) statistics for the players on his favourite baseball team. What type of data are these?

A. primary microdata B. primary aggregate C. secondary microdata D. secondary aggregate

1. Suppose X~N (50, 4²). What value of x would have a z score of -2.10?

A. 58.4 B. 41.6 C. -41.6 D. 50

1. A normal distribution curve

A. continues to infinity in both directions B. continues to infinity to the right but not to the left C. continues to infinity to the left but not the right D. reaches 0 after a finite number of standard deviations in both directions

1. A litter of five kittens has a mean mass of 80.2 g and a standard deviation of 3.8 g. What is the probability for a mass greater than 90 g?

A. 99.51% B. 0.51% C. 99.49% D. 0.49%

1. What percent of values of a normally distributed variable lie between the mean and two standard deviations above the mean?

A. 95% B. 68% C. 47.5% D. 34%