Question: GMAC reported that 85 of drivers incorrectly answered a question
GMAC reported that 85% of drivers incorrectly answered a question asking them what they are supposed to do when approaching a yellow light. (The correct answer is slow down and proceed through the light only if it is safe to do so. But I’m sure you already knew that.) To verify this surprising result, 330 drivers in a random sample were asked the same question. From this sample, 274 answered incorrectly. Using a 90% confidence interval, are the results reported by GMAC validated?
Relevant QuestionsThe U. S. Census Bureau would like to estimate the average annual contributions to charity by the members of Generation Y (people born in the United States in the years 1981 through 1991). The following data show the ...Using a 90% confidence level, the U. S. Department of Labor would like to estimate the average weekly hours worked by private employees in the United States who are adults. Assume the standard deviation for the number of ...Construct a 99% confidence interval to estimate the population mean using the following data: = 60 σ = 17 n = 12 What assumptions need to be made to construct this interval? Consider the following hypotheses and sample data, and then answer the following questions using σ = 0.05. H0: μ = 10 H1: μ ≠ 10 a. What conclusion should be drawn? b. Use PHStat to determine the p value for this ...Calculate the p value for the following conditions and determine whether to reject the null hypothesis: a. One tail (upper) test, zp = 2.15, and σ = 0.10 b. One tail (lower) test, zp = 0.66, and σ = 0.05 c. Two tail ...
Post your question