Confidence and the estimated standard deviation

Reference no: EM13337930

The Arkansas State Police wish to estimate the average mph being traveled on the Interstate Highways,which cross the state.If the estimate is to be within 8 mpg of the true mean with 98% confidence and the estimated standard deviation is 22 mph,how large a sample size must be taken?

Reference no: EM13337930

Questions Cloud

Assuming normal populations with equal standard deviations : An educator is considering two different videotapes foruse in a half-day session designed to introduce students to thebasics of economics. Students have been randomly assigned to twogroups,and they all take the same written examination after viewingt..

Should we reject the directors claim : The director of admissions at a large university says that 15% of high school juniors to whom she sends university literature eventually apply for admission. In a sample of 300 persons to whom materials were sent,30 students applied for admission. In..

Preliminary study the population standard deviation : A consumer agency has retained an independent testing firm to examine a television manufacturer's claim that its 25-inch console model consumes just 110 watts of electricity.

Favor of the airlines e-mail idea : An airline has surveyed a simple random sample of air travelers to find out whether they would be interested in paying a higher fare in order to have access to email during the flight.

Confidence and the estimated standard deviation : The Arkansas State Police wish to estimate the average mph being traveled on the Interstate Highways,which cross the state.If the estimate is to be within 8 mpg of the true mean with 98% confidence and the estimated standard deviation is 22 mph,how l..

Confidence interval for the population mean would equal : A random sample of size 15 taken from a normally distributed population revealed a sample mean of 75 and a sample variance of 25. The upper limit of a 95% confidence interval for the population mean would equal?

Determine a confidence interval estimate : Your statistics instructor wants you to determine a confidence interval estimate for the mean test score for the next exam. In the past, the test scores have been normally distributed with a mean of 74.2 and a standard deviation of 30.9. A 95% confi..

Different from their counter-parts across the nation : The International Coffee Association has reported the mean daily coffee consumption for U.S. residents as 1.65 cups.Assume that a sample of 38 people from a North Carolina city consumed a mean of 1.84 cups of coffee per a day, with a standard deviati..

Determineand interpret the p-value for the test : For a sample of 12 items from a normallydistributed population for which the standard deviation is σ =17.0, the sample mean is 230.8. At the 0.05 level of significance,test Hο : μ ≤ 220versus H 1 : µ > 220. Determineand interpret the p-value for the ..

User Account

All Pages