Homework Answers
21. Since Researcher A want to determine whether or not there is a true difference in stress levels due to engaging the meditation, so Researcher A would be ending up with the results t(27)=2.15, p<0.05.
22. Since Researcher B want to determine whether or not meditation is even related to stress, so Researcher B would be ending up with the results: r(23)=0.29, p>0.05.
23. Since here we compare two groups: Meditators and Non-meditators and assume two independent samples come from two independent normal populations with equal but unknown variances. Then we use 2 sample t test with equal variance and hence total degrees of freedom=total no. of people participated-2=27. Hence total no. of people participated=27+2=29.
24. Since here researcher B use Student's t test to check the true correlation coefficient between meditation and stress is significant or not and under null hypothesis, this test statistic follows t distribution with n-2 degrees of freedom where, n=total no. of people participated. Hence n=total no. of people participated=23+2=25.
25. Researcher A since Researcher A has considered difference in stress levels between Meditators and Non-meditators.
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Use the following to answer Questions 21 and 25: Researcher A conducted a study and analysis...
Question 1 A researcher conducted a study to examine the association between having a central venous...
Question 1 A researcher conducted a study to examine the association between having a central venous catheter and the risk of developing bloodstream infection (measured as infected vs. not infected). The results for this association show an odds ratio (OR) of 1.52 with a 95%CI of (1.29 – 2.15). Thus you conclude that………………………………. Question 2 A researcher conducted a study to examine the association between oral care with Chlorhexidine Gluconate and the risk of developing ventilator associated pneumonia (measured...
Question 1 A researcher conducted a study to examine the association between having a central venous...
Question 1 A researcher conducted a study to examine the association between having a central venous catheter and the risk of developing bloodstream infection (measured as infected vs. not infected). The results for this association show an odds ratio (OR) of 1.52 with a 95%CI of (1.29 – 2.15). Thus you conclude that………………………………. Question 2 A researcher conducted a study to examine the association between oral care with Chlorhexidine Gluconate and the risk of developing ventilator associated pneumonia (measured...
PLEASE help ?? A researcher conducted a single sample t-test on results of an experiment with...
PLEASE help ??
A researcher conducted a single sample t-test on results of an experiment with n = 18 participants and the computed t = -2.28. What is the correct conclusion from this experiment if p < 0.05, 2-tails test is used for hypothesis testing? O A. The researcher failed to reject the null hypothesis and concluded that there is a significant treatment effect. O B. The researcher rejected the null hypothesis and concluded that there is a significant treatment...
Use the information below to answer questions 17-20 A medical researcher has conducted tests on a...
Use the information below to answer questions 17-20 A medical researcher has conducted tests on a new method of detecting hepatic (liver) tumors in heavy drinkers and wants to report his findings in the Journal of the American Medical Association. The following table shows his results. Tumor No tumor Total Positive 105 80 185 Negative 15 Total120 880 800 815 1000 17. What is the prevalence of hepatic tumors? a, 58% b. 88% c. 12% d. 85% 18. What is...
Use the following information to answer the following questions. A study was conducted to determine if...
Use the following information to answer the following questions. A study was conducted to determine if anticoagulants (warfarin) can provide greater benefit in preventing stroke than antiplatelet agents (aspirin). Of 973 patients aged ≥75 years free of stroke who were eligible and agreed to participate, 488 were randomly assigned to warfarin treatment, and 485 to aspirin treatment. They were then followed up for 3 years, during which 21 strokes occurred in warfarin group, and 44 strokes in aspirin group. (Data...
2) A study done in 2016 showed that 38% of drivers admitted to text messaging while driving. A researcher decides to conduct another study to see if things have changed since then. The resea...
2) A study done in 2016 showed that 38% of drivers admitted to text messaging while driving. A researcher decides to conduct another study to see if things have changed since then. The researcher wants the new study to have no more than a confidence level of 95%. results? 4% error with a How many responses does the researcher need to achieve these b) There is not enough evidence to reject the claim d) There is not enough evidence to...
use chart for 21-26 Question 21 5 pts Greene & Touchstone conducted a study to relate...
use
chart for 21-26
Question 21 5 pts Greene & Touchstone conducted a study to relate birth weight to the estriol levels from 24-hour urine specimens taken from pregnant women who are near term. The test can provide indirect evidence of an abnormally small fetus. The scatter plot of the data is shown below. We want to perform a statistical test to find linear relationship between birth weight and estriol levels. Linear regression result shows that y = 21.52 +...
use first chart for 21-26 Question 21 5 pts Greene & Touchstone conducted a study to...
use
first chart for 21-26
Question 21 5 pts Greene & Touchstone conducted a study to relate birth weight to the estriol levels from 24-hour urine specimens taken from pregnant women who are near term. The test can provide indirect evidence of an abnormally small fetus. The scatter plot of the data is shown below. We want to perform a statistical test to find linear relationship between birth weight and estriol levels. Linear regression result shows that y = 21.52...
A study was conducted to see if people who use the Internet have also paid to download music. In a representative sampl...
A study was conducted to see if people who use the Internet have also paid to download music. In a representative sample of 771 adults who use the Internet, 507 admitted that they have paid to download music. Let p represent the true proportion of all Internet-using adults who have paid download music. Complete parts a through g below. a. Compute a point estimate of p. The point estimate of p is (Round two decimal places as needed.) to download...
Use the following scenario to answer Questions 7-11. You are interested in studying whether the presence...
Use the following scenario to answer Questions 7-11. You are interested in studying whether the presence of friends is related to risk-taking behaviors in adolescents. You create a driving simulation game where participants are confronted with multiple obstacles in which they can choose to make a safe or risky choice (e.g., choosing to speed up or stop at a changing light). You have a group of n = 25 adolescents complete the game in the presence of two of their...
PLEASE help ??
A researcher conducted a single sample t-test on results of an experiment with n = 18 participants and the computed t = -2.28. What is the correct conclusion from this experiment if p < 0.05, 2-tails test is used for hypothesis testing? O A. The researcher failed to reject the null hypothesis and concluded that there is a significant treatment effect. O B. The researcher rejected the null hypothesis and concluded that there is a significant treatment...
Use the information below to answer questions 17-20 A medical researcher has conducted tests on a new method of detecting hepatic (liver) tumors in heavy drinkers and wants to report his findings in the Journal of the American Medical Association. The following table shows his results. Tumor No tumor Total Positive 105 80 185 Negative 15 Total120 880 800 815 1000 17. What is the prevalence of hepatic tumors? a, 58% b. 88% c. 12% d. 85% 18. What is...
2) A study done in 2016 showed that 38% of drivers admitted to text messaging while driving. A researcher decides to conduct another study to see if things have changed since then. The researcher wants the new study to have no more than a confidence level of 95%. results? 4% error with a How many responses does the researcher need to achieve these b) There is not enough evidence to reject the claim d) There is not enough evidence to...
use
chart for 21-26
Question 21 5 pts Greene & Touchstone conducted a study to relate birth weight to the estriol levels from 24-hour urine specimens taken from pregnant women who are near term. The test can provide indirect evidence of an abnormally small fetus. The scatter plot of the data is shown below. We want to perform a statistical test to find linear relationship between birth weight and estriol levels. Linear regression result shows that y = 21.52 +...
use
first chart for 21-26
Question 21 5 pts Greene & Touchstone conducted a study to relate birth weight to the estriol levels from 24-hour urine specimens taken from pregnant women who are near term. The test can provide indirect evidence of an abnormally small fetus. The scatter plot of the data is shown below. We want to perform a statistical test to find linear relationship between birth weight and estriol levels. Linear regression result shows that y = 21.52...
A study was conducted to see if people who use the Internet have also paid to download music. In a representative sample of 771 adults who use the Internet, 507 admitted that they have paid to download music. Let p represent the true proportion of all Internet-using adults who have paid download music. Complete parts a through g below. a. Compute a point estimate of p. The point estimate of p is (Round two decimal places as needed.) to download...
Use the following scenario to answer Questions 7-11. You are interested in studying whether the presence of friends is related to risk-taking behaviors in adolescents. You create a driving simulation game where participants are confronted with multiple obstacles in which they can choose to make a safe or risky choice (e.g., choosing to speed up or stop at a changing light). You have a group of n = 25 adolescents complete the game in the presence of two of their...
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