In 2011 the U.S. Department of Transportation reported with 95% confidence that the average length of a motor vehicle trip in the United States was 9.72 miles with a margin or error of 0.22 miles. With 95% confidence the authors of the report are claiming that the true average length of a motor vehicle trip in the United States is between and miles. The level of confidence for this estimate is %. Submit Question

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Suppose that for a test of proportion we have :p=0.5 and . The test statistic z=1.53 and the p-value is reported as P-value = 0.063. Find the error in the reasoning.     This is a right-tailed test so the P-value should be 0.9370.     This is a two-tailed test so the P-value should be 0.126.     The P-value should have been calculated using the studentâ s t-distribution.     There is no error in the reasoning.     None of these.

An economist predicts that in the next 50 years gas will be 0.02 based on the last 7 months of 2015. What type of error did she make ? Extrapolation? Simpson’s paradox? Influential outlier? Volunteer sample?

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Please solve a, b, and c.  Note: Please explain and show steps for solutions especially for part c.

I’m not sure if the first answer is correct

Please explain. In a survey, 11 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $41 and standard deviation of $4. Find the margin of error at a 90% confidence level.Give your answer to two decimal places.

Assume the cholesterol levels of an adult can be described by a Normal model with a mean of 183 ​mg/dL and a standard deviation of 27. Complete parts a through e.   ​b) What percent of adults do you expect to have cholesterol levels over 190 ​mg/dL?   enter your response here   ​% ​(Round to two decimal places as​ needed.) Part 3 ​c) What percent of adults do you expect to have cholesterol levels between 150 and 160 ​mg/dL?   enter your response here   ​% ​(Round to two decimal places as​ needed.) Part 4 ​d) Estimate the interquartile range of cholesterol levels.   IQR=enter your response here   ​mg/dL ​(Round to the nearest integer as​ needed.) Part 5 ​e) Above what value are the highest​ 15% of​ adults' cholesterol​ levels?   enter your response here   ​mg/dL ​(Round to the nearest integer as​ needed.)