Determine whether the study is an experiment or an observational study, and then identify a major problem with the study.A medical researcher tested for a difference in systolic blood pressure levels between male and female students who are 12 years of age. She randomly selected four males and four females for her study.This is an observational study because the researcher does not attempt to modify the individuals.What is a major problem with the study?OA. The sample is too small.OB. The sample includes male and female students.(...OC. There is no blinding, which has a high chance of leading to bias.OD. This is a convenience sample with voluntary response, which has a high chance of leading to bias.4DELLNextPal

Let us first define what is observational study and experimental study Observational study: In an…

Answered: Determine whether the study is an…

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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Q3. Paired sample t test can be used in an analysis involving pre-test and post-test data or in cross-over trials. YesB. NoC. None of the above
A health educator wants to evaluate the effect of a dental film on the frequency with which children brush their teeth. A random selection of 8 children are used for the experiment. First, a baseline of the number of times the children brush their teeth over a month's period is established. Next, the children are shown the dental film and again the number of teeth brushings are recorded for a month. The following data are recorded. Subject 1 2 3 4 5 6 7 8 After film 28 29 25 30 25 27 28 24 Baseline 25 28 22 30 26 24 25 22 Assume you are evaluating H0 with the t test. The df for determining tcrit equal _________. 1. 8 2. 16 3. 7 4. 14
The McFarland Insurance Company Claims Department reports the mean cost to process a claim is $60. An industry comparison showed this amount to be larger than most other insurance companies, so the company instituted cost-cutting measures. To evaluate the effect of the cost-cutting measures, the Supervisor of the Claims Department selected a random sample of 26 claims processed last month and recorded the cost to process each claim. The sample information is reported below in dollars ($). 45 49 62 40 43 61 48 53 67 63 78 64 48 54 51 56 63 69 58 51 58 59 56 57 38 76 Using a 0.05 significance level, is it reasonable to conclude that $60 is the mean cost to process a claim?
Four scenarios of statistical studies are given below. Decide which study uses a population parameter. Answer O Lakeside Family Dentistry reported that 6 of the 15 patients who came in for a regular cleaning one day had at least one cavity. O As part of her senior project, Kaisa asked 84 of her classmates if they voted in the last presidential election. 39 said yes. O of 351 dog owners who were surveyed, 70 reported owning two dogs. The average finish time for the Ironman, Kona was 11:32 for the 1883 finishers, with an average swim time of 1:14, an average bike time time of 4:14.
The table below summarizes data from a survey of a sample of women. Using a 0.05 significance level, and assuming that the sample sizes of 900 men and 300 women are predetermined, test the claim that the proportions of agree/disagree responses are the same for subjects interviewed by men and the subjects interviewed by women. Does it appear that the gender of the interviewer affected the responses of women? Gender of Interviewer Woman Man Women who agree Women who disagree 589 249 311 51 Click here to view the chi-square distribution table. Identify the null and alternative hypotheses. Choose the correct answer below. O A. Ho: The proportions of agree/disagree responses are different for the subjects interviewed by men and the subjects interviewed by women. H: The proportions are the same. O B. Hn: The proportions of agree/disagree responses are the same for the subjects interviewed by men and the subjects interviewed by women. H: The proportions are different. OC. Ho: The response of…
In a study, you ask the subjects their age in years. Is this data qualitative or quantitative?
A running coach wanted to see whether runners ran faster after eating spaghetti the night before. A group of six runners was randomly chosen for this study. Each ran a 5 kilometer race after having a normal dinner the night before, and then a week later, reran the same race after having a spaghetti dinner the night before. The times for their races are shown in the table below. What test statistic should be used in a test for these samples? Runner 1 Runner 2 Runner 3 Runner 4 Runner 5 Runner 6 Regular Dinner 1019 s 1004 s 1028 s 989 s 1035 s 1015 s Spaghetti Dinner 1012 s 999 s 1025 s 988 s 1036 s 1018 s Group of answer choices -2.45 2.45 ±1.31 1.31
You are interested in testing if there is an association between marital status (married vs. never married) and BMI (quantitative). Which of the following is the most appropriate statistical test that you will you use? A. One-sample T-testB. Independent Sample t-testC. Chi Square testD. None of the above
Perform the hypothesis test that there is a relationship between gender and major 4) at 5% level of significance using the information from the sample below. Math Major English Major Total Male 42 72 114 30 72 09 132 06 204 Female Total
Dr. Carlton conducts a study to determine the effectiveness of a new intervention for those suffering from eating disorders. He compares patients' weights before the intervention to the same patients' weights after the intervention. What is the appropriate statistical test? a. paired samples t test b. between-subjects, one-way ANOVA. c. independent-samples t test d. Mann–Whitney U test
A researcher is studying the effects of the college experience on attitudes, values, and behaviors and is comparing random samples of freshman and seniors at the same university. Is there a significant difference in political ideology? (On this scale, 10 means "very conservative" and 1 means "very liberal") FRESHMAN SENIORSmean=5.23 mean=5.12s=1.78 s=1.07N=145 N=105
A running coach wanted to see whether runners ran faster after eating spaghetti the night before. A group of six runners was randomly chosen for this study. Each ran a 5 kilometer race after having a normal dinner the night before, and then a week later, reran the same race after having a spaghetti dinner the night before. The times for their races are shown in the table below. What test statistic should be used in a test for these samples? Runner Runner 5 6 Runner 1 Runner 2 Runner 3 Runner 4 Regular Dinner 1019 s 1004 s 1028 s 989 s 1035 s 1015 s Spaghetti 1012 s 999 s 1025 s 988 s 1036 s 1018 s Dinner 2.45 -2.45 ±1.31 O 1.31

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