A clinical trial is planned to compare an experimental medication designed to lower blood pressure to a placebo. Before starting the trial, a pilot study is conducted involving seven participants. The objective of the study is to assess how systolic blood pressure (SBP) changes over time if left untreated. SBP is measured at baseline and again 4 weeks later. Is there a statistically significant difference in SBP over time? Run the test at a 5% level of significance. Baseline 120 145 130 160 152 143 126 Four weeks 122 142 135 158 155 140 130   (Use Excel)

Q: The western blot assay is a blood test for the presence of hiv. It has been found that this test…

A: From the provided information, Sample size (n) = 400 Level of significance (α) = 0.05

Q: he DASS-21 questionnaire is a validated measure of depression, anxiety, and stress. For the general…

A: Given that the mean for the anxiety for the population is 4.2 As it scales from the questions 0 to…

Q: Brink studied the effect of postural change on cardiovascular reactivity for a sample of healthy…

A:

Q: Researchers are testing whether a new treatment significantly changes the happiness of a group as…

A: The given data is measure of happiness for both groups after a month of receiving treatment.

Q: Define and explain Type I and Type II errors and relate each to the selection of an alpha level.

A: Type I error - Type I error is rejecting the null hypothesis when it is actually true.  When the…

Q: To combat antibiotic resistance a throat swab is recommended to confirm strep throat before a…

A: From given : n=60 x=18 Sample proportion p^=1860=0.3

Q: The drug Tamiflu (oseltamivir phosphate) is used to attack the influenza virus to reduce symptoms…

A:

Q: A study assessed the lung destructive index among smokers and non- smokers provided the following…

A: H0 : The smokers and non smokers have the same lung damage i.e. μ1=μ2 H1 : The smokers have greater…

Q: students are tested again at the end of the year. Their test scores revealed an average improvement…

A: students are tested again at the end of the year. Their test scores revealed an average improvement…

Q: A researcher wanted to examine whether type of dog food (freeze dried meat vs generic brand kibble)…

A:

Q: A recent study on the effects of Tamiflu looked into whether the antiviral medication can reduce the…

A: Denote μ1, μ2 as the population average flu durations of individuals with placebo (1st population)…

Q: Does buttered toast fall face down? Data was collected to test this. 40 slices of toast (each with…

A: Given data number of success , x= 24.0 sample size, n = 40 population…

Q: A randomized controlled trial is run to evaluate the effectiveness of a new drug for Parkinson’s…

A:

Q: The test statistic is 1.26. Which of the following is the best interpretation of this value?

A: Given that  Test statistic is given by Z = 1.26

Q: Do incomes in the US differ by political views? To answer this question, ANOVA study was conducted…

A:

Q: A clinical trial is planned to compare an experimental medication designed to lower blood pressure…

A: The test hypotheses are given below: From the given information, the claim of the problem is testing…

Q: 1. Researchers are interested if the distribution of values for the change in HB (Hemoglobin)…

A: "Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: large research project showed that in a sample of 750 adults, 60 of them experienced a midlife…

A:

Q: You are conducting a study to see if the proportion of women over 40 who regularly have mammograms…

A: Concept of p-value: The p-value in hypothesis testing is the probability of obtaining a test…

Q: Researchers wanted to measure the effect of alcohol on the development of the hippocampal region in…

A: The following information has been provided: Normal Volume provided (μ)(\mu) =  9.029.02…

Q: A home decorator thinks that people prefer kitchens to be painted blue. She gives a survey where she…

A: The Chi-Square test of independence is used to determine a significant relationship between two…

Q: Did the authors note any differences in gender with regard to fish consumption and inflammatory…

A: HI, as per our policy, we'll answer the first three subparts for you.  Given:

Q: Left ventricular mass (LVM) is an important risk factor for subsequent cardiovascular disease. A…

A: We will be performing Paired sample t-test for hypothesis testing. Following are steps involved:

Q: Doctors are now considering prescribing social activities as a way to increase the overall health of…

A: The condition is given as the study is performed on the same subjects before and after.This is a…

Q: Show complete solutions and round off your answers up to 4 decimal places. A prospective study on…

A: Based on the 2 x 2 matrix provided in the question, Risk difference, Relative Risk and Odd ratio is…

Q: Research indicates that there may be a relationship between caffeinated coffee consumption and risk…

A: Given :       Caffeinated coffee     Depression <1 cup/wk >=1 cup/day 2-3 cups/day 4+…

Q: Using the provided output, what is the pvalue and what are the results of the test?

A: Test is that whether there is an association between caffeinated coffee intake and clinical…

Q: The researcher department of traffic and risk management conducted the study in controlling speed…

A: Given: MPH (miles per hour) (x) Braking Distance (feer) (y) 20 20 30 45 40 81 50 133 60…

Q: The drug Tamiflu (oseltamivir phosphate) is used to attack the influenza virus to reduce symptoms…

A:

Q: We are testing whether a particular program of low impact exercise can improve the cholesterol level…

A: Solution: n= 38 Sample size  x = ∑xn=266.938=7.0237 Sample mean s= ∑(x-x)2n-1s =1.6480 Sample…

Q: vo analysts measured the Calcium content of a homogenized banana sample. The results of 10 trials…

A: Null Hypothesis: H0: The two Analysts have same precision. Alternative Hypothesis: H1: The two…

Q: A normal population has a mean of μ = 25 on a communication effectiveness scale. After receiving a…

A: From the provided information, Sample size (n) = 4 Level of significance (α) = 0.05

Q: When we see an interaction effect in a one-way independent ANOVA, this refers to:       The…

A:

Q: A clinical trial is planned to compare an experimental medication designed to lower blood pressure…

A:

Q: A researcher wanted to examine whether type of dog food (freeze dried meat vs generic brand kibble)…

A: Solution: Given information: n= 13 Sample size  MD=7.0 Difference of sample mean SSD=144  Sum of…

Q: A clinical trial is planned to compare an experimental medication designed to lower blood pressure…

A: The data set is, Baseline 120 145 130 160 152 143 126 4 weeks 122 142 135 158 155 140 130…

Q: Overproduction of uric acid in the body can be an indication of cell breakdown. This may be an…

A:

Q: Suppose the investigators are reluctant to assume that the change in LVM over four years is normally…

A: 1. Since, we don't assume that population is normally distributed we use non parametric tests. In…

Q: A company claims that their product has an average lifespan of 6 years. An independent company…

A: It is an important part of statistics. It is widely used.

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.