Suppose a new drug is available for treating high blood pressure. We want to investi its effect by running a controlled experiment: • We randomly select some patients with high blood pressure and randomly divide t into two groups, Group A and Group B.

Polyunsaturated fatty acids in the diet favorably affect several risk factors for cardiovascular disease.  The principal dietary polyunsaturated fat is linoleic acid.  Suppose we randomly selected twelve adults for our study.  We took their blood pressure measurements (systolic blood pressure) at the start and recorded them for each adult.  Then we placed required these adults to consume 23g/day of safflower oil which is high in linoleic acid for four weeks.  At the end of the four weeks, we took another systolic blood pressure(SBP) measurement.  The paired data is provided below: Subject 1 2 3 4 5 6 7 8 9 10 11 12 Baseline SBP 119.67 100.00 123.56 109.89 96.22 133.33 115.78 126.39 122.78 117.44 111.33 92.39 1-month SBP 117.33 98.78 123.83 107.67 95.67 128.89 113.22 121.56 126.33 110.39 107.00 93.06 Use the appropriate nonparametric test at alpha level of 0.05, to test whether the diet heavy in linoleic acid increases systolic blood pressure (SBP).     Use Steps 0-5

A pharmaceutical company wants to test whether their the incidence of side effects (i.e. adverse events) differs between the treatment and placebo groups at the a = 0.05. Let pı = the proportion of subjects in the treatment groups who experienced at least one adverse event and let p2 = the proportion of subjects in the placebo group who experience at least one adverse event. 8 out of 30 people in the treatment group experienced at least one adverse event and 5 out of 30 people in the placebo group experienced at least one adverse event. (a) Set up the null and alternative hypothesis (using mathematical notation/numbers AND interpret them in context of the problem) (b) Calculate the test statistic (c) Calculate the critical value (d) Draw a picture of the distribution of the test statistic under Ho. Label and provide values for the critical value and the test statistic, and shade the critical region. (e) Make and justify a statistical decision at the a = 0.05 level and state your…

A medical student at a community college in city Q wants to study the factors affecting the systolic blood pressure of a person (Y) Generally, the systolic blood pressure depends on the BMI of a person (B) and the age of the person A. She wants to test whether or not the BMI has a significant effect on the systolic blood pressure, keeping the age of the person constant. For her study, she collects a random sample of 125 patients from the city and estimates the following regression function: Y= 15.50 + 0..90B+1.15A. (0.55) (0 40) The test statistic of the study the student wants to conduct (Ho: B, = 0 vs. H, B, #0), keeping other variables constant is. (Round your answer to two decimal places.) At the 5% significance level, the student will ▼ the null hypothesis. Keeping BMIl constant, she now wants to test whether the age of a person (A) has no significant effect or a positive effect on the person's systolic blood pressure. So, the test statistic associated with the one-sided test the…

What are the requirements for an experiment to be able to show that changes in one variable cause changes in another?

Hi, i would need help on this exercise as well, I will upload the pic.

Suppose we want to study the effect of smoking on lung capacity in women. Match the study to experimental or observational.                                       Find 100 women age 20 who do not currently smoke. Randomly assign 50 of the 100 women to the smoking treatment and the other 50 to the no smoking treatment. Those in the smoking group smoke a pack a day for 10 years while those in the control group remain smoke free for 10 years.  Measure lung capacity for each of the 100 women.                                       Find 100 women age 30 of which 50 have been smoking a pack a day for 10 years while the other 50 have been smoke free for 10 years.  Measure lung capacity for each of the 100 women.  Analyze, interpret, and draw conclusions from data.

A researcher wants to explore the differences in health effects from two different types of sugar. She hypothesizes that artificial sweetener has lower long term health benefits than natural sugar. She will change her methods this time... This time she will have people consume artificial sweetener for a year and measure their health benefits, and then she will have the same people consume natural sugar for the next year and measure their health benefits that year as well.  What type of t-test should she use?     Group of answer choices a) Paired Samples b) No answer text provided. c) One sample d) Independent Samples

Suppose we want to use systolic blood pressure to predict diastolic blood pressure. The explanatory variable is  and the response variable is

one hundred adults who had their Type 1 or Type 2 diabetes were selected to determine if the inhalable version of insulin is able to manage blood sugar 'vels just as swell as injected insulin. The adults uses the inhaler for 3 months and then their blood sugar levels were recorded. Then they uses the injection for 3 months and then their blood sugar levels were also recorded. If we want to test if there is a difference in .average blood sugar levels using the two methods ?Which inference procedure should we use [Hint: test statistics ] None of these .A O Confidence interval about the population mean of the secondgroup .B O t-test about the difference between two means for independent samples CO t-test about the mean difference for paired samples .D O Confidence interval about the population mean of the first group .E O