L02 Quiz_ Homework_ Social Science Statistics

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Brigham Young University, Idaho *

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221 C

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Statistics

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Apr 3, 2024

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L02 Quiz: Homework Due Jan 20 at 10:59pm Points 10 Questions 10 Time Limit None Allowed Attempts 2 Instructions Attempt History Attempt Time Score LATEST Attempt 1 10 minutes 10 out of 10 Score for this attempt: 10 out of 10 Submitted Jan 16 at 6:16pm This attempt took 10 minutes.  Question 1 1 / 1 pts Correct! The number of people in a randomly selected classroom on campus Preparation Download the L02 Homework Assignment (https://byuistats.github.io/BYUI_M221_Book/hp/L02/02_HW_Assignment_A.html) and answer the questions. Attempt each problem on your own. You are encouraged to collaborate with other students after your first attempt. Download the L02 Homework Answer Key (https://byuistats.github.io/BYUI_M221_Book/hp/L02/02_HW_Answer_Key_A.html) and check your answers. Take the Quiz You may use your notes, but you should complete the quiz without help from others. This quiz is a tool to help you and your instructor gauge your progress. Take the Quiz Again Which of the following variables is/are quantitative? (Mark all that apply)

The 3 most common brands of car found in the US The telephone number of a randomly selected business in town  Question 2 1 / 1 pts Correct! Sampling randomly tends to reduce sampling bias or risk Sampling randomly (with a large sample) gives a perfect reflection of the population Sampling randomly is easier than sampling nonrandomly Actually, there is no statistically valid reason for sampling randomly  Question 3 1 / 1 pts Correct! Stratified random sampling Systematic random sampling Cluster sampling Simple random sampling  Question 4 1 / 1 pts Stratified random sampling Correct! Systematic random sampling Cluster sampling Which one of the following is a statistically valid reason for sampling randomly when choosing subjects for a study? A study conducted by researchers from the Department of Education wanted to know the average debt of college students in the United States. In order to obtain a sample representative of all students, the researchers divided college students into the four classes (freshman, sophomore, junior, and senior) and then took a random sample of students from each class. Which sampling method did they use? Students in an Introductory Statistics class at BYU-Idaho were studying prices of cold cereal at grocery stores in Rexburg. To get a sample of cold cereal prices, they went to Albertson's and rolled a die to decide which box from the left of the top shelf they would start on. They then recorded every 6th cereal after the first, moving from left to right down the shelves, recording the name, size, and price of each cereal in their sample. Which sampling method did they use?

Simple random sampling  Question 5 1 / 1 pts Correct! A parent group examines 25 recently released PG-13 movies and records the number of sexual innuendos and curse words that occur in each. A sample of 504 patients in early stages of Alzheimer's disease is divided into two groups. One group receives an experimental drug and the other a placebo. The advance of the disease is tracked at one-month intervals over the next year.  Question 6 1 / 1 pts All men and women in their 50's Correct! The men and women who took the drug or placebo The researchers The drug and placebo  Question 7 1 / 1 pts All men and women in their 50's The men and women who took the drug or placebo Which of the following studies depicts an observational study? Say that you are a researcher for a large pharmaceutical company that has produced a new drug that is believed to help reduce the risk of developing arthritis. You test the drug and compare it to a placebo by randomly choosing one group of men and women in their 50's to take the drug and one group of men and women in their 50's to take a placebo. Each participant takes the drug or placebo for a period of 10 years, after which the effects of the drug are measured against the effects of the placebo. What (or who) are the experimental units or subject? Say that you are a researcher for a large pharmaceutical company that has produced a new drug that is believed to help reduce the risk of developing arthritis. You test the drug and compare it to a placebo by randomly choosing one group of men and women in their 50's to take the drug and one group of men and women in their 50's to take a placebo. Each participant takes the drug or placebo for a period of 10 years, after which the effects of the drug are measured against the effects of the placebo. What are the treatments?

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The researchers Only the men and women who took the drug Correct! The drug and placebo  Question 8 1 / 1 pts Correct! All registered voters in the US The 2969 people who answered the survey questions The 8000 people who received a phone call  Question 9 1 / 1 pts Randomly selecting locations on the water's surface to sample Selecting locations at various depths where the water looks most murky Correct! Selecting locations to measure at random depths and at random distances from the shore Randomly selecting spots along the shore of the lake to sample Selecting locations at various depths where the water looks most clear  Question 10 1 / 1 pts Design the study Collect the data Correct! Each presidential election, many different groups want to know how popular each candidate is among the electorate. In the recent election, one marketing research firm was asked by a special interest group to help estimate the proportion of Americans who supported a particular candidate. From a list of all registered voters, 8000 names were randomly selected. An automated phone-call was made to each of the 8000 individuals selected asking them to answer a few questions indicating their voting preferences. The marketing firm received 2969 responses. The population for this study was: A study is being planned in order to estimate the parts per million of a particular pollutant in a lake's water. Which of the following sample plans would lead to the most representative sample? Amy is doing statistical research for her semester project. On Monday she does a graph of one of the variables in her data. Which step of the statistical process is Amy working on?