In a random sample of six microwave ovens, the mean repair cost was $90.00 and the standard deviation was $11.00. Assume the variable is normally distributed and use a t-distribution to construct a 90% confidenceinterval for the population mean u. What is the margin of error of u?
The 90% confidenceinterval for the popula
I need to find out how to calculate the margin of error when given the data: c=95; s=0.10; n=20; x(bar) = 1.5 and how to construct a confidenceinterval of the population mean. This example is similar to my studies.
A recent poll (fictitious) reports that President Obama's "approval rating" is 52% and a statement says, "This poll has an error rate of 3%." The poll sampled 1300 people. (Note: The "3%" is the "margin of error." There is no computation of the confidenceinterval formula needed).
This is an application of a confidence inter
A sample of n=16 scores is obtained from an unknown population. The sample has a mean of M=46 with SS=6000.
a. Use the sample data to make an 80% confidenceinterval estimate
of the unknown population mean.
b. Make a 90% confidenceinterval estimate of μ.
c. Make a 95% confidenceinterval estimate of μ.
This problem is solved:
Let's summarize the method for finding the 95% confidenceinterval using a step-by-step illustration. Suppose that a certain automobile company wishes to determine the expected miles per gallon for one of its new models. Based on years of experience with cars, the company statistician realizes that not
A machine produces 9 inch latex gloves. A sample of 85 gloves is selected, and it is found that 36 are shorter than they should be. Find the 98% confidenceinterval on the proportion of all such gloves that are shorter than 9 inches
Use the given degree of confidenceand sample data to find a confidenceinterval for the population standard deviation o. Assume that the population has a normal distribution.
Weights of men: 90% confidence; n=14, Xbar=160.9lb, s=12.6lb
ConfidenceIntervals for Population Proportions
5.The new Twinkle bulb is being developed to last more than 1000 hours. A random sample of 100 of these new bulbs is selected from the production line. It was found that 64 lasted more than 1000 hours. Find the point estimate for the population proportion, the margin of error fo