C431 Quiz 2 Question and answers 100% correct graded A+

C431 Quiz 2 Question and answers 100% correct graded A+The Bonferroni correction divides the error risk (alpha) across all of the comparisons. For example, if alpha is set at 0.05 and six comparisons are made, then the required level of significance becomes ___. 0.0083 In a hypothetical study, researchers have a normally distributed sample and a normally distributed set of data derived from the sample. The study is comparing the amount of weight lost among this group of subjects with the amount of weight loss reported by the National Child Fitness Program (NCFP). The NCFP reported in a 2011 study that daily exercise of 30 minutes at target heart rate would produce a 2% average weight loss (± 0.5%) among obese, but otherwise healthy children between ages 9 and 12 years. Based on the scale of the data, the shape of the distribution, and the type of comparison to be made, which statistical test should be used? One-sample t-test In a hypothetical study on weight loss among otherwise healthy, but obese children between 9 and 12 years old, researchers compared kickball, basketball, soccer, flag football, and capture-the-flag. The amount of weight loss associated with each type of activity was compared to the average amount of weight loss reported by the NCFP (National Child Fitness Program). In the NCFP 2% average weight loss (± 0.5%) was achieved by having children jog on a treadmill for 30 minutes at their target heart rate. The researchers in the present study were interested in identifying physical education activities that achieved the same or more weight loss compared to the treadmill. The variable of weight was found to be normally distributed among all intervention groups. In the basketball group the average amount of weight loss after 4 weeks was 2 pounds, with a standard deviation of 0.5 pounds. What percentage of the basketball group lost between 1.5 and 2.5 pounds? approximately 68% In a hypothetical study of weight loss among overweight but otherwise healthy 9-12 year olds, the average percentage weight loss among the group that played basketball was 2% (± 0.5%). Which of the following values is most likely to be a true population parameter for weight loss, based on a 95% confidence interval for the test statistic? 2.3% weight loss Researchers had two groups (Treatment A and Treatment B) to compare. They were interested in whether the mean cholesterol level was different between the two treatment groups. The data collected for each group were found to be normally distributed and the standard deviation for each group was nearly identical. The people included in each group were completely independent and their interventions were also independent. Which statistical test would be appropriate to use in this situation? independent samples t-test The following table represents results of a study comparing three different treatments for temporal mandibular joint disorder (TMD). The data for each group were found to be normally distributed with a similar standard deviation. Based on the information presented in the table, which statistical test should be performed? ANOVA . The Framingham Calculator is a tool clinicians can use to determine a patient's 10-year risk of having a heart attack. It takes into account age, sex, total cholesterol, HDL cholesterol, smoking, systolic blood pressure, and whether the patient is currently being treated for high blood pressure. These seven variables when combined have a far greater predictive value than any one of them alone or any combination of them with less than seven variables. Which statistical test would have been performed in order to identify these seven variables as having the best predictive value? Regression analysis Researchers wanted to determine if the amount of time spent sitting at a desk during regular work hours was associated with amount of weight gain. In other words, they wanted to know if the number of hours sitting was a predictor of the response of weight gain. The data points of time sitting and weight gain were found to be normally distributed. Which statistical test would make the most sense for this research question? Pearson product moment correlation coefficient What type of statistical test is represented by the diagram? Pearson product moment correlation coefficient Which type of statistical test is employed when researchers are determining how survey items group together into subscales? factor analysis A/an ___ is used to measure the degree of association among items in a survey. Cronbach's alpha A researcher conducts a study analyzing the fast food eating habits of 1500 adolescent students. The researcher compares the eating habits of older high school students with access to their funds to younger middle school age children who rely on their parents to pack, prepare, or purchase their lunches. The researcher conducts a 2-tailed test that results in a p-value of 0.004. What can be concluded about this test? The results are significant A team of researchers at the CDC investigate a potential link between carcinogenic foods and stomach cancer. The average carcinogenic food intake is 112 mgs per day. The resulting r value = .89 with a p-value of 0.032. What can be concluded about this test? There is an association between carcinogenic foods and cancer in this sample Use the following contingency table to compute sensitivity, specificity, positive predictive value, negative predictive value, positive likelihood ratio, and negative likelihood ratio. Note to instructor: You can determine whether you want to provide students with the formulas for the calculations. Patients who have the condition Patients who do not have the condition Total Patients who tested positive 125 10 135 Patients who tested negative 20 250 270 Totals 145 260 What is the sensitivity for this diagnostic test? (round the number to a whole number)? B. 86%