Confidence Intervals: For confidence intervals, as precision decreases confidence:   A. Increases   B. Decreases   C. Remains the same

n 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 _____

Widening the confidence interval from 95% to 99% increases the ______ but decreases the ______.     a. precision; reliability     b. precision; confidence     c. confidence; precision     d. accuracy; precisio

P VALUE? TEST STATISTIC? CONFIDENCE INTERVAL ___TO____

p estimate the average cost of flowers for summer weddings in a certain region, a journalist selected a random sample of 15 summer weddings that were held in the state. A graph f the sample data showed an approximately symmetric distribution with no outliers. The sample mean and standard deviation were $734 and $102, respectively. The journalist will reate a 95 percent confidence interval to estimate the population mean. Have all conditions for inference been met? A Yes, all conditions have been met. No, the 15 weddings in the sample were not selected at random. C. No, the sample size is not large enough to assume the sampling distribution of sample means is approximately normal. D No, because the graphical display is approximately symmetric it cannot be assumed that the sampling distribution of sample means is approximately normal. No, the sample size of 15 is not less than 10 percent of all weddings in the state. B.

Hypothesis Test with a Known Standard DeviationAfter many years of commuting, Suzy knows that the can bike to her office in 17 minutes with a standard deviation of 1 minute. While shopping, she finds an all-natural energy drink and decides to use it to shorten her commute time. Suzy records 12 morning commutes with an average time of 16.5 minutes in which she drank the energy drink before biking. Is there sufficient evidence to show that the energy drink helped? Conduct a hypothesis test at the 5% significance level.H0:μ≥17Ha:μ<17 a. Conduct a hypothesis test and report the p-value.p=  (Include four decimal places) b. At the 5% significance level, we conclude that Suzy bikes faster after drinking the energy drink. True False

Hypothesis Test with a Known Standard DeviationAfter many years of commuting, Suzy knows that the can bike to her office in 17 minutes with a standard deviation of 1 minute. While shopping, she finds an all-natural energy drink and decides to use it to shorten her commute time. Suzy records 12 morning commutes with an average time of 16.5 minutes in which she drank the energy drink before biking. Is there sufficient evidence to show that the energy drink helped? Conduct a hypothesis test at the 5% significance level.H0:μ≥17H0:μ≥17Ha:μ<17Ha:μ<17Useful tools:Normal Distribution Calculatort-Distribution Calculator Conduct a hypothesis test and report the p-value.p=p=  (Include four decimal places)   At the 5% significance level, we conclude that Suzy bikes faster after drinking the energy drink. True False

Confidence Intervals A study is conducted on the amount of time Alzheimer's patients spend in stage IV sleep. Number of minutes spent is Stage IV sleep is recorded for 50 patients. The standard error for computing the 95% confidence interval is 2.2. What would be the margin of error for computing the 95% confidence interval? Round to the 1,000ths place. You must show your work to receive credit.