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- QUESTION The table below shows the two-way classification of 400 undergraduate students who were randomly selected from Namibia University of Science and Technology (NUST). Number of cigarettes Level of cardio-vascular problems NUiSOncf smoked per day None Moderate Severe Liome Less than 5 98 32 15 kI5 5 - 10 62 32 56 150 More than 10 20 25 60 105 180 89 LL00 Test, at 5% significance level, whether level cardio-vascular problems is related to number of cigarettes smoked per day among these students.Solve in digital formatEmily is calculating an ANOVA. How should she calculate the degrees of freedom between groups? Group of answer choices (n-1)/k N-k k-1 n-1
- please show working out. Thank you A University has put in place a 4 week course of lunchtime exercise breaks for its staff to see if its employees’ job satisfaction can be improved. To measure the effectiveness of this program, 10 randomly selected staff in the program were surveyed about their feelings at work, once at the start of the program and again after the course. Higher scores indicate higher satisfaction. The job satisfaction index results for this group were: Staff 1 2 3 4 5 6 7 8 9 10 Before 34 28 29 45 26 27 24 15 15 27 After 33 31 36 46 32 34 28 26 19 37 Use a test of significance at 5% level to decide if the program has improved the employee’s job satisfaction on average. Show your graphical evidence, if needed, and clear conclusion. - please sketch the curve as well. thank youA pairwise comparison is a comparison of two pieces of fruit. a comparison of two means. a comparison of two variances.Number of Flights Arriving on Time Number of Flights Arriving Late Sunshine Airline 33 5 Comfort Airlines 43 6 The table above contains data from a study of two airlines - Sunshine Airlines & Comfort Airlines - which fly from BWI to Shore City, FL. If one flight is selected, find P (on time and Comfort Airlines).
- Which of the following situations is appropriate for a two-factor (also called two-way) ANOVA test? Group of answer choices To determine if keyboard type and gender influence average writing performance. To determine if keyboard type influences average writing performance. To determine if gender influences average writing performance. None of the AboveA scientist is studying the effect of a new type of exercise program on cardiovascular health. The scientist randomly assigns individuals to either the exercise program or a control group. The scientist wants to determine if the exercise program has a statistically significant effect on cardiovascular health. The scientist monitors cardiovascular health by measuring the blood pressure of each individual. The type of program the individual experienced is which of the following? (Select all that apply) The Explanatory Variable Ordinal The Response Variable Categorical Binary Quantitative CategoricalHow do the average weekly incomes of electricians and carpenters compare? A random sample of 17 regions in the United States gave the following information about average weekly income (in dollars). (Reference: U.S. Department of Labor, Bureau of Labor Statistics.) Region 1 2 3 4 5 6 7 8 9 Electricians 464 715 597 464 736 694 744 571 806 Carpenters 542 813 513 476 688 503 789 653 474 Region 10 11 12 13 14 15 16 17 Electricians 592 594 702 579 868 598 597 654 Carpenters 489 647 676 384 817 605 556 505 Does this information indicate a difference (either way) in the average weekly incomes of electricians compared to those of carpenters? Use a 5% level of significance. (a) What is the level of significance? (b) Compute the sample test statistic. (c) Find the P-value of the sample test statistic.
- Performing a statistical analysis on managers and employees, and we need to determine whether the data is "significant" enough to consider the two groups to have different levels of desirability. How is the level of significance, p = 0.05, set?Does the type of instruction in a college statistics class (either lecture or self-paced) influence students’ performance, as measured by the number of quizzes successfully completed during the semester? Twelve students were recruited for the study. Students received the lecture instruction or a self-paced instruction. The total number of quizzes completed during teach type of instruction appear below.review(5a): Given the ANOVA table below ,how many groups are there? Source SS df MS Fstatistic Between 324 Within 1215 27 total 1539 49 (a) 49 (b) 5 (c) 4 (d) 50
