MATH 300 - Stat Milestone Practice1.Questions and Answers

MATH 300 - Stat Milestone Practice1.Questions and Answers Data that was gathered for a past study and re-used to answer questions in a present study is called __________ data. biased available raw confounding RATIONALE Available data has already been collected. Since the data was gathered for a past study, it is an available or existing dataset. In a survey of a large high school class, responses to which two of the following questions will be qualitative? Are you male or female? How many minutes do you spend working on homework on a typical weeknight? What is your height in inches? Are you right-handed or left-handed? RATIONALE Qualitative simply describes things and can't be represented with numbers which can then be used in arithmetic. Gender simply describes someone. Which of the following describes simple random sampling? Choose a sample in such a way that every nth person or item is included. Choose a sample so that every member of the population has an equal chance of being selected for the sample. First divide the population into groups, and then randomly pick individuals from each group, so that the sample is proportionate to the population. Divide the population into groups, and then randomly select some groups. Choose all the members within the selected groups to be part of the sample. RATIONALE The definition of a simple random sample means that every item in the sample can be chosen with equal probability. Max conducted a clinical trial for a new vitamin supplement. He had two groups in his clinical trial. The control group was given a sugar pill, and the treatment group was given the new vitamin supplement. However, many of the participants in the control group reported improvements in their general health, similar to the treatment group. The ________ may describe the reason some participants from the control group reported health improvements. response variable treatment group confounding variable placebo effect RATIONALE When people in a control group indicate that there is some noticeable change, in this case an improvement in health, this is an example of what we call a placebo effect. Which of the following describes cluster sampling? First divide the population into groups, and then randomly pick individuals from each group, so that the sample is proportionate to the population. Choose a sample so that every member of the population has an equal chance of being selected for the sample. Divide the population into groups, and then randomly select some groups. Choose all the members within the selected groups to be part of the sample. Choose a sample in such a way that every nth person or item is included. RATIONALE Cluster sampling is when the population is broken up into clusters, which are generally based on something like geography. You then randomly choose groups or clusters and members of those clusters are included in the sample. Which of the following is true about the CPI, based on th