Question: More and more people are abandoning national brand products and
More and more people are abandoning national brand products and buying store brand products to save money. The president of a company that produces national brand coffee claims that 40% of the people prefer to buy national brand coffee. A random sample of 700 people who buy coffee showed that 259 of them buy national brand coffee. Using α = .01, can you conclude that the percentage of people who buy national brand coffee is different from 40%? Use both approaches to make the test.
Answer to relevant QuestionsIn a poll conducted by The New York Times and CBS News, 44% of Americans approve of the job that the Supreme Court is doing (The New York Times, June 8, 2012). Assume that this percentage was true for the population of ...Alpha Airline claims that only 15% of its flights arrive more than 10 minutes late. Let p be the proportion of all of Alpha’s flights that arrive more than 10 minutes late. Consider the hypothesis test H0: p < .15 versus ...A statistician performs the test versus and finds the p-value to be .4546. a. The statistician performing the test does not tell you the value of the sample mean and the value of the test statistic. Despite this, you have ...What are the four possible outcomes for a test of hypothesis? Show these outcomes by writing a table. Briefly describe the Type I and Type II errors. Consider H0: µ = 45 versus H1: µ < 45. a. A random sample of 25 observations produced a sample mean of 41.8. Using α = .025, would you reject the null hypothesis? The population is known to be normally distributed with σ ...
Post your question