Do you think that by choosing the statistical analysis first, and then deciding upon what kind of research plan (i.e., so that the data will suit the analysis) could bias the entire research enterprise?
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Do you think that by choosing the statistical analysis first, and then deciding upon what kind of research plan (i.e., so that the data will suit the analysis) could bias the entire research enterprise?
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- The medical community unanimously agrees on the health benefits of regular exercise, but are adults listening? During each of the past 15 years, a polling organization has surveyed americans about their exercise habits. In the most recent of these polls, slightly over half of all American adults reported that they exercise for 30 or more minutes at least three times per week. The following data show the percentages of adults who reported that they exercise for 30 or more minutes at least three times per week during each of the 15 years of this study. Year Percentage of Adults Who Exercise 30 or more minutes at least three times per week 1 41.7 2 44.4 3 47.5 4 45.6 5 46.5 6 47.9 7 47.9 8 51.2 9 49.5 10 49.1 11 49.6 12 52.6 13 50.4 14 54.3 15 52.6 Choose the correct time series plot. (i) (ii) (iii) (iv) Does a linear trend appear to be present? use simple linear regression to find the parameters for the line that minimizes…How to conduct an observational study on to answer the question: “Are males more likely than females to be dog owners? For example, “I went to the park during the hours of 2:00-4:00 pm on a Saturday afternoon. I observed 10 dog owners, two were female, eight were male. It appears that more females than males are dog owners.” Finally, your report should also include your study limitations—that is, what factors could be present that would make my conclusions incorrect?The medical community unanimously agrees on the health benefits of regular exercise, but are adults listening? During each of the past 15 years, a polling organization has surveyed americans about their exercise habits. In the most recent of these polls, slightly over half of all American adults reported that they exercise for 30 or more minutes at least three times per week. The following data show the percentages of adults who reported that they exercise for 30 or more minutes at least three times per week during each of the 15 years of this study. Years 1 - 15 % of adults reported at least 3x week 1- 41.0 6- 44.5 11- 49.9 2- 44.9 7- 47.6 12- 52.1 3- 47.1 8- 49.8 13- 50.6 4- 45.7 9- 48.1 14- 54.6 5- 46.6 10- 48.9 15- 52.4 use simple linear regression to find the parameters for the line that minimizes MSE for this time series. Do not round your interim computations and round your final answers to four decimal places. For subtractive or negative numbers use a minus sign.…
- In the early 1970s, a young man challenged an Oklahoma state law that prohibited the sale of 3.2% beer to males under age 21 but allowed its sale to females in the same age group. The case (Craig v. Boren, 429 U.S. 190, 1976) was ultimately heard by the U.S. Supreme Court. The state of Oklahoma argued that the law improved traffic safety. One of the three main pieces of data presented to the court was the result of a “random roadside survey.” This survey gathered information on gender and whether or not the driver had been drinking alcohol in the previous 2 hours. A total of 619 drivers under 21 years of age were included in the survey. The chi-square test statistic is approximately 1.64 for this data. Find the P-value State a conclusion at a 5% level of significance. Do you think that the data supports the Oklahoma law that forbids sale of 3.2% beer to males and permits it to females? See image.The following table shows the cross-classification of accounting practices (either straight line, declining balance, or both) and country (either France, Germany, or United Kingdom). France Germany United Kingdom Straight Line 20 11 30 Declining Balance 14 16 15 Both 15 23 13 Set up the competing hypotheses to determine if accounting practice and country are dependent. What is the degrees of freedom for the test. Calculate the value of the test statistic (Square of x).You are an analyst for a small chain store and are told to check if any of the five stores are outperforming the other stores. You send out your survey teams and gather the following data: Range Jan - Mar Apr - June Jul - Sep Oct - Dec Group Problem Data (Franchise Performance) Store 1 Store 2 3 3 2.4 4 6 2 3.8 7.1 Store 3 2.8 3.2 4.1 7.9 Store 4 3.1 2.9 5 7 Store 5 3.2 3 2 6.6 Perform the ANOVA test and explain to the group if any of the stores outperform the others. Explain how you arrived at your answer. Be sure to share how you arrived at the null and alternative hypotheses, any mistakes you made during the analysis, and discuss the results. Hint: Your p-value is 0.966.
- The medical researcher is comparing two treatments for lowering cholesterol: diet and meds. The researcher wants to see if the patients who receive the recommendation to change their diet have equal success lowering cholesterol compared to a prescription of meds. Arandom sample of some patients who received the recommendation to change their diet and others who were prescribed meds was taken. The results of how many did or did not lower their cholesterol are shown below: Data on Diet vs. Meds for Weight Loss Diet Meds Yes| 471 578 No | 203 |184 What can be concluded at the a = 0.01 level of significance? For this study, we should use Select an answer a. The null and alternative hypotheses would be: Ho: Select an answer v| Select an answer V Select an answer v (please enter a decimal) H1: Select an answer v Select an answer v Select an answer v (Please enter a decimal) b. The test statistic ? v= (please show your answer to 3 decimal places.) C. The p-value = d. The p-value is ?v a e.…The following table shows the rank attained by male and female officers in the New York City Police Department (NYPD). Do these data indicate that men and women are equitably represented at all levels of the department? Test using a p-value approach. Male Female Officer 21,900 4281 Detective 4058 806 Sergeant 3898 415 Lieutenant 1333 89 Captain 359 12 Higher ranks 218 10 2. There are far more men than women in the police force in general. However, the NYC Police Commission has set itself certain goals with respect to the positions of the females among its ranks. Across the females they aim to target the same proportion by rank as they do among the males. The target proportions by category are: (1) Officer – 70% (2) Detectives – 15% (3) Sargent – 10% (4) Lieutenant – 3% (5) Captain – 1% (6) Higher – 1% Conduct a test to determine whether the proportions, by rank, among the…Two different teaching methods are being compared to the traditional (lecture) method of teaching calculus. Method one (computer) uses the computer for homework, exploratory projects, drill on concepts, and testing (by random computer generated tests). Method two (project) uses a graphing calculator, weekly projects to guide students through concepts, class discussion, and student presentations. Random samples of student exam scores from each of the three groups (lecture, computer, and project) are to be compared. Assume the following: - These groups of students had never been exposed to calculus previously;- All three groups of students were equivalent initially so that any difference among groups could be attributed to the teaching strategy employed;- The sample came from normally distributed populations with homogeneity of variance already met; and- The same final exam was given and grades from this final represent at least interval data. According to final exam scores seen in the…
- Jane Doe is the proprietor of the brand-new Scarborough, Canada eatery JD Company. It is a restaurant on Jackson Street where you can eat as much as you want. Jane Doe was concerned that his restaurant might not survive the competition given the abundance of pubs and eateries in the vicinity. In order to find out which of the 4Ps of marketing his customers preferred, he decided to organize a survey. Referring to the dataset below, the survey's findings are as follows: Based on the survey, please submit the following information: What is the profile of the respondents in terms of: Education Sex What is the level of importance to the respondent the following attributes of a restaurant in Scarborough, Canada? Product Quality Competitive Price Accessibility Advertising Capability What is the level of customer satisfaction of the respondents of restaurants in Scarborough, Canada? Do the attributes of a restaurant in Scarborough, Canada predict or explain customer…The Bureau of Labor Statistics reports that the official unemployment rate for Black people was 10.4% and 4.7% for White people in February 2015. Select all correct answers for this question. O The samples of white and black people are independent. The explanatory variable is the unemployment rate. The response variable is the unemployment rate. The response variable is race.The medical community unanimously agrees on the health benefits of regular exercise, but are adults listening? During each of the past 15 years, a polling organization has surveyed americans about their exercise habits. In the most recent of these polls, slightly over half of all American adults reported that they exercise for 30 or more minutes at least three times per week. The following data show the percentages of adults who reported that they exercise for 30 or more minutes at least three times per week during each of the 15 years of this study. Year Percentage of Adults Who Exercise 30 or more minutes at least three times per week 1 41.1 2 45 3 47.2 4 45.6 5 46.5 6 44.4 7 47.7 8 49.9 9 48 10 49 11 50 12 52.2 13 50.7 14 54.5 15 52.3 use simple linear regression to find the parameters for the line that minimizes MSE for this time series. Do not round your interim computations and…