Find 90 percent confidence interval estimate average score

Assignment Help Basic Statistics

Reference no: EM13902111

The standard deviation of test scores on a certain achievement test is 11.3. If a random sample of 81 students had a sample mean score of 74.6, find a 90 percent confidence interval estimate for the average score of all students.

Reference no: EM13902111

Questions Cloud

Determine a 95 percent confidence interval estimate : An electric scale gives a reading equal to the true weight plus a random error that is normally distributed with mean 0 and standard deviation σ = .1 mg. Suppose that the results of five successive weighings of the same object are as follows: 3..

Give a 95 percent lower confidence interval : The PCB concentration of a fish caught in Lake Michigan was measured by a technique that is known to result in an error of measurement that is normally distributed with a standard deviation of .08 ppm (parts per million- Give a 95 percent conf..

Clearly identify the healthy people 2020 topic chosen : Clearly identify the Healthy People 2020 topic chosen and why this topic was chosen

A normally consolidated clay soil in the field : A normally consolidated clay soil in the field has a compression index of .25. The initial void ratio, was .6 with stress 3000 lb/ft^2. a) Find the void ratio if the stress is increased to 4500 lb/ft^2. b) find the primary consolidation settlement if..

Find 90 percent confidence interval estimate average score : The standard deviation of test scores on a certain achievement test is 11.3. If a random sample of 81 students had a sample mean score of 74.6, find a 90 percent confidence interval estimate for the average score of all students.

Core activities of a typical human resources department : core activities of a typical human resources department in health care organizations?

A 30ft thick clay layer with doudble drainage settles : A 30ft thick clay layer with doudble drainage settles 3 inches, in a time period of 2 years. The clay has a coefficient of consolidation of .000791 in^2/sec. a) Calculate the ultimate primary consolidation settlement. b) how long will it take to sett..

Determination of the number of points : Determination of the number of points Dewatering in a project location, determined

Compute a 99 percent two-sided confidence interval : A sample of 20 cigarettes is tested to determine nicotine content and the average value observed was 1.2 mg. Compute a 99 percent two-sided confidence interval for the mean nicotine content of a cigarette if it is known that the standard deviation..

User Account

All Pages