HW #1 MAT 120 Sections 1.1-1.4
(1) Classify the following variables as qualitative or quantitative:
(a) The voter's choice for a council election. ______
(b) The monthly US trade deficit. ______
(2) Identify the quantitative variable as discrete or continuous:
(a) An air pressure reading from a barometer. ______
(b) Passes caught by a wide receiver. ______
(3) Identify as either a parameter or statistic:
(a) 70% of US Senators favored a recent bill. ______
(b) 56% of 1,045 respondents in a poll favored the same bill. ______
(4) Work #56, p. 13, answers here:
(a)
(b)
(c)
(d)
(5) Is the following an observational study or an experiment?
(a) In order to determine the psychological effects of different light bulbs, Lab mice are split into two groups, one of which is subjected to CFL light, the regular to regular fluorescent. ______
(b) A poll is conducted in which 300 people are asked which candidate they favor in a nearing election. ______
(6) Given the data in #11, p. 28, generate a random sample of 5 states, using the TI-8x and a seed of 27.
(7) Identify the type of sampling used (systematic, cluster, stratified, simple random, convenience)
(a) In a factory producing filaments, every 12th filament manufactured is tested until 100 filaments are collected. ______
(b) A study randomly selects 45 different classes at a University, then those students are interrogated about their lifestyles. ______
(c) A voter survey seeks to correlate political affiliation with income, and random samples of voters from different income ranges are taken. ______
(d) The findings of an internet poll conducted in SC indicate that Gov. Haley is a frontrunner for the U.S. presidency. ______
(8) A database of consultants has each member assigned an ID, which number from 1 to 5670. If a study on contracts wishes to take a systematic sample of 50 members, determine k, and list the ID's of the first five members. Use the TI-8x and a seed of 23.