The subject has more freedom to respond to a/an ________. questionnaire survey interview experiment
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Q: observational?
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A: Given: Two or more random samples are considered independent if:
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- Which of the following statements is true regarding ANOVA? O The goal of ANOVA is to explain variation in sample data O Tukey's Test can be conducted after running a two factor ANOVA with replication O Two factor ANOVA without replication allows you test for interaction effects O Both a. and b. are true statements O Both a. and c. are true statements O Both b. and c. are true statementsJulius has conducted a very small study of the amount of sleep his dorm mates get each night. He believes that those who are on one of the school’s sports teams will get more sleep (measured in hours per night) than those who are not. Julius surveyed 12 people. Of these, 6 played on a sports team and 6 did not. The descriptive statistics from his survey are given below. PLAYS SPORTS (Sample 1) DOES NOT PLAY SPORTS (Sample 2) 8 6 9 6 8 5 7 7 8 7 7 6 What is the critical value for this test? what is the t-obtain value for this t-test? Based on your t-obtained value, what should you conclude about the null hypothesis for this test?Presidents, Popes, Monarchs Listed below are numbers of years that U.S. presidents, popes, and British monarchs lived after their inauguration, election, or coronation, respectively. Assume that the data are samples randomly selected from larger populations. Test the claim that the three samples are from populations with the same median.
- Question: T-tests are widely used in public health research. Please list one scenario that a two-sample t-test is appropriate, and one scenario that paired t-test is appropriate. Make sure to justify why the specific type of t-test is appropriate for the scenario.The percent of college students' marijuana use for a sample of 95,633 students is shown in the accompanying pie chart. Find the probability of each event listed in parts (a) through (d) below. Click the icon to view the pie chart. (a) Randomly selecting a student who never used marijuana The probability is %. (Round to one decimal place as needed.) (b) Randomly selecting a student who used marijuana The probability is %. (Round to one decimal place as needed.) (c) Randomly selecting a student who used marijuana between 1 and 29 of the last 30 days The probability is%. (Round to one decimal place as needed.) (d) Randomly selecting a student who used marijuana on at least 1 of the last 30 days The probability is %. (Round to one decimal place as needed.)Quasi-experimental designs classify cases by: a. manipulating independent variables of interest. b. using the naturally occurring status of participants. c. manipulating dependent variables of interest d. using random assignment
- Question Bias Which of the following survey questions would NOT show bias? Select one: Don't you agree that eating whole grain food improve your O a. health? O b. How much do you exercise during an average week? O c. If someone is distracted by text messaging while they are driving, are they more likely to have an accident? O d. Is outsourcing of jobs to other countries justified if it takes away current jobs from American citizens.Question 3 A researcher wants to statistically test whether gender and political affiliation affect IQ scores. Which test should the researcher use? three-way ANOVA within-groups ANOVA one-way ANOVA two-way ANOVAA SAT prep course claims to increase student scores by more than 60 points, on average. To test this claim, 9 students who have previously taken the SAT are randomly chosen to take the prep course. Their SAT scores before and after completing the prep course are listed in the following table. Test the claim at the 0.01 level of significance. SAT Scores 1170 1200 | 1040 | 1280 || 1450 1470 | 1500 Before Prep Course | 1010 980 After Prep Course 1100 | 1260 1190 | 1280 | 1170 | 1370 1440 1500 1520 280 | 20 80 | 130 90 Difference 90 10 30 20
- Determine whether the study is an experiment or an observational study, and then identify a major problem with the study. In a survey, 1465 Internet users chose to respond to this question posted on a newspaper's electronic edition: "Is news online as satisfying as print and TV news?" 52% of the respondents said "yes." This is an ▼ observational study experiment because the researchers ▼ apply a treatment to do not attempt to modify the individuals. What is a major problem with the study? A. The sample is not very large. B. This is a convenience sample with voluntary response, which has a high chance of leading to bias. C. There is no blinding or replication, which has a high chance of leading to bias. D. The results apply only to Internet users.Random digit dialing telephone surveys used to exclude cell phone numbers. If the opinions of people who have only cell phones differ from those of people who have landline service, the poll results may not represent the entire adult population. The Pew Research Center interviewed separate random samples of cell-only and landline telephone users who were less than 30 years old. Here’s what the Pew survey found about how these people describe their political party affiliation. Do we reject, or fail to reject, the null hypothesis?Motor Vehicle Fatalities The table below lists motor vehicle fatalities by day of the week for a recent year (based on data from the Insurance Institute for Highway Safety). Use a 0.01 significance level to test the claim that auto fatalities occur on the different days of the week with the same frequency. Provide an explanation for the results.