Which of the following is a quality criterion for appraising a systematic review? Question 2 options: results presented as a meta-analysis providing details about the search strategy data synthesis provided in a Forest plot inclusion of only randomized controlled trials
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Which of the following is a quality criterion for appraising a systematic review?
Question 2 options:
results presented as a meta-analysis
providing details about the search strategy
data synthesis provided in a Forest plot
inclusion of only randomized controlled trials
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- It turns out that the survey study at the U of M sampled students from a single student residence hall. Explain why sampling students from a single residence hall would have an impact on the external validity of the study.Which of the following study designs is most efficient in studying a rare exposure?A. Case controlB. Cross-sectionalC. CohortD. None of the aboveIn light of a number of recent large-corporation bankruptcies, auditors are becoming increasingly concerned about the possibility of fraud. Auditors might be helped in determining the chances of fraud if they carefully measure cash flow. To evaluate this possibility, samples of midlevel auditors from CPA firms were presented with cash-flow information from a fraud case, and they were asked to indicate the chance of material fraud on a scale from 0 to 100. A random sample of 36 auditors used the cash-flow information. Their mean assessment was 36.21, and the sample standard deviation was 22.93. For an independent random sample of 36 auditors not using the cash-flow information, the sample mean and standard deviation were respectively 47.56 and 27.56. Test the assumption that population variances for assessments of the chance of material fraud were the same for auditors using cash-flow information as for auditors not using cash-flow information against a two-sided alternative hypothesis.
- . Although there is a popular belief that herbal remedies such as Ginkgo biloba and Ginseng may improve learning and memory in healthy adults, these effects are usually not supported by wellcontrolled research (Persson, Bringlov, Nilsson, and Nyberg, 2004). In a typical study, a researcher obtains a sample of n = 16 participants and has each person take the herbal supplements every day for 90 days. At the end of the 90 days, each person takes a standardized memory test. For the general population, scores from the test form a normal distribution with a mean of μ = 50 and a standard deviation of σ = 12. The sample of research participants had an average of M = 54. Assuming a two-tailed test, state the null hypothesis in a sentence that includes the two variables being examined. Using the standard 4-step procedure, conduct a two-tailed hypothesis test with α = .05 to evaluate the effect of the supplements.On a particular proposal of national importance, males and females cast votes as included in the following table In Favor Opposed Undecided Male 90 65 43 Female 115 74 32 Suggest an appropriate test for the data and analyze it at 1% level of significance.In a one-way analysis of variance with three treatments, each with five measurements, in which a completely randomized design is used, what is the degrees of freedom for treatments?
- A study, which randomly surveyed 3,700 households and drew on this information from the IRS, found that 79% of households have conducted at least one IRA rollover from an employer-sponsored retirement plan. Suppose a recent random sample of 90 households in a certain county was taken and respondents were asked whether they had ever funded an IRA account with a rollover from an employer-sponsored retirement plan. Based on the sample data below, can you conclude at the 0.10 level of significance that the proportion of households in the county that have funded an IRA with a rollover is different from the proportion for all households reported in the study? 77 respondents said they had funded an account; 13 respondents said they had notFive samples of a ferrous-type substance were used to determine if there is a difference between a laboratory chemical analysis and an X-ray fluorescence analysis of the iron content. Each sample was split into two subsamples and the two types of analysis were applied, with the accompanying results. Assuming that the populations are normal, test at the 0.10 level of significance whether the two methods of analysis give, on the average, the same result.Use the following description for Questions 1-2: Assume we design a statistical study where 10 participants try 3 chocolate types (A, B,C) inrandomized order for 7 days, i.e., each participant tries 3 types of chocolate (A, B,C) in randomizedorder every day for 7 days. We are interested in testing if the chocolate type impacts taste preference(response variable, on a scale 0-10). Question 1: What type of study design would you recommend for this study? What is/are the factors? What is/are the block(s)? A.) Latin squares design with two factors and one block. Factors are the Chocolate type (3 levels: A, B, C) and Participant (10 levels representing 10 participants) Block is day (7 levels representing weekdays). B.) Two-way ANOVA with two factors. Factors are Chocolate type (3 levels: A, B, C) and Participant (10 levels representing 10 participants). C.) Latin squares design with one factor and two blocks. Factor is the Chocolate type (3 levels: A, B, C). Blocks are Participants (10…
- Use the following description for Questions 1-2:Assume we design a statistical study where 10 participants try 3 chocolate types (A, B,C) inrandomized order for 7 days, i.e., each participant tries 3 types of chocolate (A, B,C) in randomizedorder every day for 7 days. We are interested in testing if the chocolate type impacts taste preference(response variable, on a scale 0-10). Question 1: What type of study design would you recommend for this study? What is/are the factors? What is/are the block(s)? A.) Latin squares design with two factors and one block. Factors are the Chocolate type (3 levels: A, B, C) and Participant (10 levels: representing 10 participants). Block is Day (7 levels: representing days). B.) Latin squares design with one factor and two blocks. Factor is the Chocolate type (3 levels: A, B, C). Blocks are Participant (10 levels: representing 10 participants) and Day (7 levels: representing days). C.) Latin squares design with two factors and one block. Factors are…BASED ON THE CASE SCENARIO, ANSWER QUESTION 55-60In the leg ulcer trial, 233 patients with venous leg ulcers were randomly assigned to intervention group using a new regime treatment (Group 1) or the control group using the standard care (Group 2). Patients were treated and followed up for 3 months.The researcher would like to determine if there is any association between types of treatment for leg ulcer and ulcer status (healed or not healed) at 3 months. Which statistical method is appropriate for the above case? 1. Pearson’s correlation2. Chi square goodness of fit test3. Simple linear regression4. Chi square test for independenceAn analysis of variances produces dftotal = 16 and dfwithin = 14. For this analysis, how many treatment conditions are being compared?