Using ANOVA example on body temperature for different age groups, test whether these programmers commit same number of errors on average. State Ho vs Ha Test statistic
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- Researchers investigate how the presence of cell phones influence the quality of human interaction. Subjects are randomly selected from a population and divided into an experimental group that is asked to leave their phones in the front of the room and a control group that are not asked to leave their cell phones at the front of the room. Subjects are left alone for 10 minutes and then asked to take a survey designed to measure quality of interactions they had with others in the experiment. What statistical test is appropriate?Conduct a hypothesis test to see if the data provide evidence that mean body mass gain is higher for mice with a light on at night. Show all details of the test. If the results are significant, can we conclude that there is a causal association? Why or why not? Use stat key please. The dataset is below: Condition BMGain Corticosterone DayPct Consumption GlucoseInt GTT15 GTT120 Activity Light 9.89 42.132 71.552 3.387 Yes 378.704 328.704 5752 Dark 5.02 87.838 31.063 3.791 No 228.448 134.483 1437 Light 9.58 48.238 61.453 3.451 No 379.091 227.273 1256 Light 11.2 92.191 85.978 3.501 Yes 366.129 383.871 244 Dark 6.67 191.22 41.408 3.923 No 231.183 220.43 2541 Light 9.05 51.999 64.827 4.24 No 392.373 250 1231 Dark 8.17 67.7 47.573 4.489 No 226.563 141.406 346 Dark 2.79 41.017 34.947 4.161 No 323.077 199.038 5837…Medical statitsics Suppose we are studying the risk factors associated with mortality of Covid-19 patients admitted to hospitals in the Philippines. The response variable is whether or not the patient with Covid-19 died at the end of their hospitalization. Other variables recorded were: the time to death of the patient, sex, age, vaccinated or not vaccinated, presence of comorbidities, severity of Covid-19, variant of Covid-19, etc. In this study, would you prefer using the logistic regression or the Cox PH regression? Justify your answer. Site some of the advantages and disadvantages of preferring one method over the other.
- Do wearable devices that monitor diet and physical activity help people lose weight? Researchers had 237 subjects, already involved in a program of diet and exercise, use wearable technology for 24 months. They measured their weight (in kilograms) before using the technology and 24 months after using the technology. (a) Explain why the proper procedure to compare the mean weight before using the wearable technology and 24 months after using the wearable technology is a matched pairs t test. Choose the correct explanation. A person's weight before and after wearing the device would not be independent; thus, the data from this before and after study should be analyzed using a matched pairs t test. O A person's weight before and after wearing the device would be independent; thus, the data from this before and after study should be analyzed using a matched pairs t test. O A person's weight before and after wearing the device would be independent; thus, the data from this before and after…What is omitted variable bias?Researchers were interested in assessing whether stress levels are different at the beginning of the semester compared to finals week. To test this, stress was measured in 5 students at the start of the semester and then again at the end of the semester during finals week. Participant Stress 1 Stress 2 Difference Score (Di) (Di - Mdiff)2 1 22 22 0 2 32 34 -2 3 24 25 -1 4 28 30 -2 5 26 29 -3 What is the observed test statistic (i.e., tobs)? Round to 2 decimal places.
- Identify the statistical procedures that are appropriate for the data. When possible, identify descriptive statistics, inferential statistics, and a measure of effect size Research suggests that the antioxidants in foods such as blueberries can reduce and even reverse age-related declines in cognitive functioning ( Joseph et al., 1990) to test this phenomenon, a researcher selects a sample of n = 25 adults aged 70 to 75 and administers a cognitive function test to each participant. The participants then drink a blueberry supplement every day for 4 months before they are tested again. The researcher compares the scores before treatment with the scores after treatment to see if there is any change ion cognitive function.Using a sample of 500 adults with the following variables: genhelf - variable recording general self- reported health coded 1 = very good, 2 = good, 3 = fair, 4 = poor sbp - variable recording systolic blood pressure - age - age of the respondent in years sex coded 1 = male and 2 = female hi_sbp - indicator of high blood pressure coded 1 if the respondent's sbp is 130 or higher and 0 otherwise What type of chart is MOST appropriate for the variable sbp? a/ pie chart b/ bar chart c/ histogramProvide the general form of the Pearson goodness-of-fit test statistic. Р
- The best depiction of a population characteristic is a(an): Dependent variable Statistic Independent variable ParameterThe results of a common standardized test used in psychology research is designed so that the population mean is 105 and the standard devlation is 30. A subject earns a score of 108. What is the Z-score for this raw score? Z-Score =Tracking Signal is used to determined if the forecaste bias is within limit or not True or False ?