Solve question using R
Dr. Whistle was interested in evaluating whether her therapy for post-traumatic stress disorder (PTSD) was effective for treating a group of trauma (abuse) survivors. Thirty-eight trauma survivors received three weeks of therapy and then completed a PTSD scale. Dr. Whistle’s research hypothesis is that the mean PTSD score for those receiving the therapy will be less than for the general population of trauma survivors (μ = 65, σ = 8). Use null hypothesis testing (all steps) to answer Dr. Whistle’s research question. Be sure to appropriately interpret the confidence interval and effect size (even if it is subjective) and include a general summary of the results. The dataset (below) is entitled ‘ass4_q1.csv’. Use α = .01.
ass4_q1.csv
ID | PTSD |
1 | 60 |
2 | 56 |
3 | 73 |
4 | 52 |
5 | 57 |
6 | 57 |
7 | 49 |
8 | 68 |
9 | 49 |
10 | 70 |
11 | 55 |
12 | 60 |
13 | 77 |
14 | 60 |
15 | 50 |
16 | 56 |
17 | 62 |
18 | 78 |
19 | 51 |
20 | 49 |
21 | 67 |
22 | 50 |
23 | 63 |
24 | 52 |
25 | 61 |
26 | 57 |
27 | 51 |
28 | 59 |
29 | 69 |
30 | 60 |
31 | 61 |
32 | 69 |
33 | 63 |
34 | 60 |
35 | 50 |
36 | 48 |
37 | 51 |
38 | 67 |
Solve question using R Dr. Whistle was interested in evaluating whether her therapy for post-trau...
estimate the average age at which multiple sclerosis patients were diagnosed with the condition for the first time in a given city. How big should the sample be? Define your procedures for this estimate (if necessary, set your own values of unknown parameters, based on statistical theory). In Table 1 you will find all ages of this patient population. 54 58 56 48 62 59 55 56 60 52 53 61 56 56 53 37 71 62 39 61 54...
Problem #1: Consider the below matrix A, which you can copy and paste directly into Matlab. The matrix contains 3 columns. The first column consists of Test #1 marks, the second column is Test # 2 marks, and the third column is final exam marks for a large linear algebra course. Each row represents a particular student.A = [36 45 75 81 59 73 77 73 73 65 72 78 65 55 83 73 57 78 84 31 60 83...
Calculate a 3-months simple moving average, for each possible month of years 2014/2015/2016. Calculate the MAD, MSE and MAPE for this method. In addition to the formulas in the computer, show one manual calculation of a forecast of this method, for any month you choose (10 marks)JanFebMarAprMayJunJulAugSepOctNovDecYear474549485250515455566063201450515254565756595555658120155456585761626365676769752016
NUMBER OF PEOPLE 10.2 10.0 10.1 8.5 10.2 8.2 8 Source: United States Census. 11. In the Sanitary District of Chicago, operating engineers are hired on of a competitive civil-service examination. In 1966, there were 223 appl for 15 jobs. The exam was held on March 12; the test scores are s arranged in increasing order. The height of each bar in the histogram next page) shows the number of people with the correspondin examiners were charged with rigging the...
1. Forecast demand for Year 4. a. Explain what technique you utilized to forecast your demand. b. Explain why you chose this technique over others. Year 3 Year 1 Year 2 Actual Actual Actual Forecast Forecast Forecast Demand Demand Demand Week 1 52 57 63 55 66 77 Week 2 49 58 68 69 75 65 Week 3 47 50 58 65 80 74 Week 4 60 53 58 55 78 67 57 Week 5 49 57 64 76 77...
Write two possible hypotheses for this research problem. Cruel to be Kind Therapy Initial Stalking Stalking After Therapy 47 11 Psychodyshamic Therapy Initial Stalking Stalking After Therapy 52 47 50 18 53 47 51 34 54 50 52 57 55 53 40 50 54 58 56 57 60 56 57 55 61 61 60 61 58 59 61 62 63 61 66 60 65 61 68 61 66 62 72 61 66 62 72 62 66 62 73 64 75...
West Battery Corp. has recently been receiving complaints from retailers that its 9-volt batteries are not lasting as long as other name brands. James West, head of the TOM program at West's Austin plant, believes there is no problem because his batteries have had an average life of 60 hours, about 10% longer than competitors' models. To raise the time above this level would require a new level of technology not available to West. Nevertheless, he is concerned enough to...
48 57 Amy Bakery has four shops in different area in a city. Monthly sales (in thousands of dollars) from a random of 24 months from each of the 4 shops given in Table 1. Table 1: Monthly sales (in thousands of dollars) North East South West 77 75 97 60 45 42 60 54 56 49 68 47 44 39 58 57 63 61 69 51 75 63 79 50 90 81 99 73 32 47 46 41 41...
Problem 4: Variables that may affect Grades The data set contains a random sample of STAT 250 Final Exam Scores out of 80 points. For each individual sampled, the time (in hours per week) that the student spent participating in a GMU club or sport and working for pay outside of GMU was recorded. Values of 0 indicate the students either does not participate in a club or sport or does not work a job for pay. The goal of...
Problem 1: Confidence Interval for Percentage of B’s. The data set “STAT 250 Final Exam Scores” contains a random sample of 269 STAT 250 students’ final exam scores (maximum of 80) collected over the past two years. Answer the following questions using this data set. a) What proportion of students in our sample earned B’s on the final exam? A letter grade of B is obtained with a score of between 64 and 71 inclusive. Hint: You can do this...