Unit 3 Minitabtcc.instructure.comQuestion 1:A study conducted at the local elementary school wants to see if providing lunch will increase testscores. The previous year's average test score is 65. Before fully implementing this expensiveproposal, a random sample of 10 students were given hot breakfasts for a week and then given thesame standardized test.Test Scores65 75 58 80 9595 6060 88 85 70 73a. State the null hypothesis and the alternative hypothesis in words.b. State the null and experimental hypotheses in symbols.c. Why is this a good use of the 1-sample t-test?d. Identify the Independent Variable (IV) and Dependent Variable (DV).e. Conduct the statistical analysis using Minitab.f. Conclusions? Reject or fail to reject the null?g. Explain the confidence interval and the direction of the effect.h. Check the assumption of normalityQuestion 2:To motivate citizens to conserve gasoline, a local government is considering mounting aconservation campaign. Based on previous data, the government knows that the average familyuses 58 gallons per month. The following data are collected from a random sample of 9 familiesafter the advertising campaign:Gas (gal/month)506351585159605147Answer questions (a)-(h) above.

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Answered: Unit 3 Minitab Question 1: A study…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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In the recent census, three percent of the U.S. population reported being two or more races. However, the percent varies tremendously from state to state. Suppose 2 random surveys are conducted. In the first random survey, out of 1,000 north dakotans, 9 people reported being of two or more races. In a second random survey, out of 500 nevadans, 17 people reported being of 2 or more races. Conduct a hypothesis test to determine if the proportions are the same for the two states or if the proportion for Nevada is statistically different than that of north Dakota.
2. Mr. Bates wants to compare the midterm scores of his students who took the course during the fall semester versus the spring semester. Here is the data: Fall 89 86 64 91 92 94 87 83 86 90 74 59 87 97 87 Spring 76 70 82 94 76 66 72 51 75 97 74 81 85 96 74 Can he say that his fall students scored better than his spring students? (Use a = .10) Type of Test: Null Hypothesis: Alternate Hypothesis: SE: Test Statistic: P-value: Decision: Sentence:
Consider this study and identify the null hypothesis. (Remember: the null hypothesis is what Noel Hypothesis believes- that whatever interesting features you might think your data has are just coincidences.) An Uber driver's average customer rating is a 4.3. She decides to change how she greets passengers to a new greeting and see whether it changes how customers rate her. After the change, on her first 50 customers she sees an average rating of 4.47. Use u for her average rating from all customers using her new greeting. Ο Ημ 4.3 Hou > 4.3 Hoiu #4.3 Hou = 4.47 O Hou < 4.47 HoH+4.47
2. Use the following scenario to conduct a hypothesis test. Then use that to answer questions a- g. You would like to determine if the use of a new teaching intervention helps to improve attention in 5- year-old boys. To test this hypothesis, you have separated 35 5-year-old boys into two groups, one with the intervention (treatment group) and the other given normal class time (the control group). You would like to test if the treatment group had longer attention times (in minutes) than the control group. (The significance level of the test is .05) The following are the data for the two groups: Control Group (Group 1) 7 11 6 6 8. 11 14 7 8. 2 Treatment Group (Group 2) 11 12 14 16 18 14 11 8 7 10 11 Answer the following questions to run the hypothesis test. You should use the notation and methods described in the course: a. What test should you run? b. What is the null hypothesis in sentences and symbols? c. What is the alternative hypothesis in sentences and symbols? d. What is the…
Questions d and e
38
In 1942, an organization surveyed 1100 adults and asked, "Are you a total abstainer from, or do you on occasion consume, alcoholic beverages?" Of the 1100 adults surveyed, 440 indicated that they were total abstainers. In a recent survey, the same question was asked of 1100 adults and 418 indicated that they were total abstainers. Complete parts (a) and (b) below. C "1.M1 M2 Find the test statistic for this hypothesis test. 0.96 (Round to two decimal places as needed.) Determine the P-value for this hypothesis test. (Round to three decimal places as needed.)
The national average SAT score is roughly 1500. We would like to see if the high school seniors who apply to Duke have higher than average SAT scores. We randomly sample 100 applicants' files and record their SAT scores. Which of the following is the correct set of hypotheses for this research question? Hint: think about how many samples we have data from. OHO: H= 1500; HA: µ = 1500 Ho: H Duke National; HA: H Duke National Ho: x= 1500; HA: x > 1500 OHO: H = 1500; HA: > 1500 O Ho: P = 1500; HA: P > 1500
University officials hope that changes they have made have improved the retention rate. Last year, a sample of 2019 freshmen showed that 1555 returned as sophomores. This year, 1661 of 2096 freshmen sampled returned as sophomores. Determine if there is sufficient evidence at the 0.10 level to say that the retention rate has improved. Let last year's freshmen be Population 1 and let this year's freshmen be Population 2. Step 1 of 3: State the null and alternative hypotheses for the test. Fill in the blank below. Step 2 of 3: Compute the value of the test statistic. Round your answer to two decimal places Step 3 of 3: Draw a conclusion and interpret the decision.
Refer to the Bayer Aspirin problem: How would the alternate hypothesis be written symbolically if it read. "The population mean is less than 6.0"?
A company is evaluating the knowledge retention of their fiscal policy training program by administering a quiz to a randomly selected sample of 16 employees both one week after completing training and 6 months after completing the training. Employee scores are shown in the Excel file. Has there been a significant reduction in knowledge of the fiscal policy six months after completing training? State the five hypothesis testing steps to answer this question. Employee 1 2 3 45 6 7 8 9 10 0 12 3 4 5 6 11 13 14 15 16 One week after 69 80 73 100 100 50 77 64 94 100 100 100 100 47 67 63 Six months after 70 79 77 97 95 50 60 64 84 90 80 99 94 57 58 68
Provide an appropriate response. A medical researcher wishes to try three different techniques to lower cholesterol levels of patients with high cholesterol levels. The subjects are randomly selected and assigned to one of three groups. Group 1 is given medication, Group 2 is given an exercise program, and Group 3 is assigned a diet program. At the end of six weeks, each subject's cholesterol level is recorded. Test the hypothesis that there is no difference among the means. Use a = 0.05. Apply p-value approach. Round p-value to nearest thousandth. Show step1-step3. Group1 Group2 Group3 11 8 8 12 3 12 13 10 4 15 6 6 9. 9.

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