Identify the type of observational study.A researcher plans to obtain data by interviewing offspring of victims who perished in abombing. He will interview them, and people unrelated to the victims, over the next 10years to see how closeness to a traumatic event might affect recovery time.Choose the correct type of observational study below.O A. prospectiveB. retrospectiveOC. cross-sectional

The given study is the 'A researcher plans to obtain data by interviewing offspring of victims who…

Answered: Identify the type of observational…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Answer part a
A method of gathering data when people are asked a series of questions that can be administered by e-mail, via the Web, face- to-face or over the telephone, is known as a. focus groups experiments O b. O c. surveys d. direct observation
A sales team's statistical staff doesn't understand why their top salesperson's sales decreased 50% during holiday months. They bring him to the director's office, where they direct him to change his advertisement strategy. The salesperson changes his advertisement strategy and logs sales records for the months of November, December and January. This is an example of an Group of answer choices Observational Study Experiment None of the above
USING EXCEL (provide Excel screenshots) Thank you! Suppose a researcher is interested in carrying out a phase II clinical trial in order to assess the effectiveness of four different doses of an investigational new drug. Assume the following table represents the summary statistics revolving around the number of adverse events in the four fasting glucose among groups. Fasting Glucose Treatment Group 124 1 124 1 125 2 134 2 138 2 137 2 136 2 119 1 124 3 120 1 116 3 124 3 127 3 129 1 A) Calculate the MSW. B) Calculate the MSB.
cw2 The ages of the first 16 U.S. presidents at the time of their first inauguration are displayed below: president age Washington 57 John Adams 61 Jefferson 57 Madison 57 Monroe 58 J.Q. Adams 57 Jackson 61 Van Buren 54 W.H. Harrison 68 Tyler 51 Polk 49 Taylor 64 Fillmore 50 Pierce 48 Buchanan 65 Lincoln 52 Compute each of the following summary statistics. Round your answers to the nearest 0.1 years. Consider the data to be the full population.median = Incorrect yearsIQR = Incorrect yearsmean = Incorrect yearsstandard deviation = Incorrect years
Give 5 examples of situations using this: 1. Retrospective Study 2. Observational Study 3. Designed Experiment
Compare and contrast an observational study and experiment. Define the terms "treatment group" and "placebo group" as part of your answer. Also give an example of each.
You want to examine the relationship between dropping out of high school and delinquency. You have a random sample of 11 students. You have the number of delinquent offenses that each student reported committing in the year before and after dropping out of school. The following table shows the data. Student Before dropping out After dropping out 1 5 7 2 9 5 3 2 3 4 7 7 5 8 11 6 11 13 7 8 4 8 8 10 9 5 7 10 2 1 11 9 3 From performing a hypothesis test to determine if the mean number of delinquent differs after dropping out, what is the obtained t?
A government agency computed the proportion of U.S. residents who lived in each of four geographic regions in a particular year. Then a simple random sample was drawn of 1000 people living in the United States in the current year. The following table presents the results. Region Past YearProportion ObservedCounts Northeast 0.171 150 Midwest 0.245 235 South 0.357 398 West 0.227 217 Send data to Excel Can you conclude that the proportions of people living in the various regions changed between the current year and the past year? Use the 0.05 level of significance and the P-value method with the TI-84 Plus calculator. What the P value?
A study on the probable number of enrollees in a school the next school year based on their enrolment statistics in a school for a 5-year period. Descriptive research Correlational research Experimental Research Historical quantitative research Causal research
The Wisconsin Fish and Game Department stocked a lake with 30% catfish, 15 % bass, 40% bluegill, and 15% Northern Pike. Five years later they took a random sample of 500 fish from the lake and found 120 catfish, 85 bass, 220 bluegill, and 75 Northern Pike. At the 5% level of significance, can we show that the distribution of fish changed over the 5-year interval? State and test appropriate hypotheses. State conclusions.
Julius 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?

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