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- The manufacturer of an MP3 player wanted to know whether a 10% reduction in price is enough to increase the sales of its product. To investigate, the owner randomly selected 8 outlets and sold the MP3 player at the reduced price. At 7 randomly selected outlets, the MP3 player was sold at the regular price. Reported below is the number of units sold last month at the regular and reduced prices at the randomly selected outlets. Regular (7 outlets) - 138, 127, 129, 114, 114, 126, 98 Reduced (8 outlets) - 122, 135, 151, 133, 113, 129, 134, 133 At the 0.050 significance level, can the manufacturer conclude that the price reduction resulted in an increase in sales? Hint: for the calculations, assume the reduced price as the first sample. Compute the pooled estimate of the variance (round to 3 decimal places) Compute the test statistic (round to 2 decimal places)The manufacturer of an MP3 player wanted to know whether a 10% reduction in price is enough to increase the sales of its product. To investigate, the owner randomly selected 8 outlets, and sold the MP3 player at its reduced price. Reported below is the number of units sold last month at the regular and reduced prices at the randomly selected outlets. Regular - 138, 127, 129, 114, 114, 126, 98 Reduced - 122, 135, 151, 133, 113, 129, 134, 133 At the 0.050 significance level, can the car manufacturer conclude that the price reduction resulted in an increase in sales? Hint: for the calculations, assume reduced price as the first sample. Compute the pooled estimate of the variance (round to 3 decimal places) Compute the test statistic (round to 2 decimal places) State your decision about the null hypothesis (Reject or Fail to reject)7th decile means 70% of the scores fall above the value of the 7th decile. True or False?
- _ A poll of 1.250 adults in the United States asked how much confidence they had in banks. A total of 196 adults said they had a great deal of confidence. An economist claims that less than 25% of U.S adults have a great deal of confidence in banks. Can you conclude the economist's claim is true? Use 0.05 level of significance. Use P method, list all steps.An environmentalist is interested in the opinions of adults on the issue of global warming. In particular, he wants to estimate the proportion of people who think that global warming is a very serious problem. In a random sample of n = 100 adults, 73% indicated that global warming is a very serious problem. Estimate the true proportion of the adult population who think global warming is a very serious problem and find the margin of error for the estimate. Use 95% CI.Professor X wants to compare a new approach to his teaching style. 24 students are matched according to their prior background and academic performance. One member of each pair is assigned to a class using his traditional teaching and the other to a class using his new teaching approach. At the end of the course, the level of learning is determined by an examination. The Dean of the business school wants to know if the students using the new approach learned more than those using traditional approach. Test at the 5% level of significance. To answer this question, Dr. Card ran several analyses and provided the out below. Note that none of these analyses might be correct. What is the correct hypothesis test for this problem? A. H0: (μ1 - μ2) = 0 H1: (μ1 - μ2) > 0 B. H0: μD = 0 H1: μD > 0 C. H0: μD = 0 H1: μD < 0 D. H0: (μ1 - μ2) = 0 H1: (μ1 - μ2) < 0 What is the conclusion? A. Do Not Reject H0 and conclude that students using the new…
- Find the point estimate for the proportion of licensure exams for nurses when a sample of 600 exam takers is surveyed, only 120 failed. Please provide it neatly with indicated given, formula, solution, and answer with interpretation.I was not getting the correct p-value I tried many time can you please me the to find the p- value in the sumIn 2019, the percent of total labor force of the world that were women was about 39%. The United Nations wonders if the percentage of females in the labor force is the same in the United States. Representatives from the United States Department of Labor plan to check a random sample of over 10,000 employment records on file to estimate the percentage of females in the United States labor force. They select a random sample of 525 employment records and find that 229 of the people are female. the interval (0.40059, 0.47179) based on 90% confidence interval. 1) Use your interval to find the margin of error associated with this confidence interval. 2) Interpret the confidence interval in this context. 3) Should the representatives from the Department of Labor conclude that the percentage of females in their labor force is higher than the world’s rate of 39%? Explain Thanks!
- A substance abuse counselor wants to demonstrate the effect of situational stress on alcohol cravings. He recruits two groups of men who are similar in respect to history of alcohol use and demographic variables. He divides them in to two groups. In one group(n=11), the men are exposed to a stressful situation and then asked to complete a measure rating their alcohol cravings on a scale from 0-10, where 0 representsno cravings and 10 represents intense cravings. In the second group (n=10), the men are exposed to a neutral situation and asked to complete the same measure. What test and graph should I create to find out if a stressful situation result in more intense alcohol cravings than a non-stressful situation?The mayor of a town has proposed a plan for the construction of a new community. A political study took a sample of 900900 voters in the town and found that 59%59% of the residents favored construction. Using the data, a political strategist wants to test the claim that the percentage of residents who favor construction is not equal to 62%62%. Testing at the 0.100.10 level, is there enough evidence to support the strategist's claim? Step 4 : Determine the P-value of the test statistic. Round your answer to four decimal places. Step 5: Identify the value of the level of significance. Step 6: Make the decision to reject or fail to reject the null hypothesis. Also, State the conclusion of the hypothesis test.How to do an ancova test using r codes to find relationship between two factors for example sun exposure and gender with continous variable age. Also compare the means if needed for factorial anova and add graph using r