Intro to statistics -exam-with verified answers -2022

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Unit 1 Challenge 1 1. A survey on Internet usage was conducted among a group of 200 students in the school cafeteria. It was found that 100 students spend at least two hours online every day. Which ... of these is an example of descriptive statistics? A: 50% of the students surveyed spend at least two hours online each day. 2. If numbers collected from a survey are measurements, what are these measurements called before you perform any calculations? A: raw data 3. Select the two categories that would yield quantitative data. A: Age of pet, Weight of pet 4. Which of these data sets represent discrete data? A: Number of questions answered incorrectly in a multiple-choice quiz Challenge 2 1. A production company is interested in collecting information on the impact of an educational documentary on everyone that watched it at the film festival. Which statement is true? A: The group of people that watched the documentary at the festival represents the population. 2. Which of these random samples qualifies as a representative sample if studying the opinion of people who use online shopping websites? A: Consumers who order products online 3. Which of these is an example of systematic random sample? A: Picking out the telephone number of every 20th person from a directory. 4. Which of these statements best defines a stratified random sample? A: It is a sample where the population is first broken into homogenous groups and then elements are randomly selected, in proportion, from each group. 5. Which of these is an example of multi-stage sampling? A: Choosing New York as a sample, then selecting a sample of zip codes within New York, then sampling the names of people living in those zip codes. Challenge 3 CONTINUED....... [Show More]

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