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The average annual miles driven per vehicle in the United States is 11.1 thousand miles, with ? ? 600 miles. Suppose that a random sample of 26 vehicles owned by residents of Chicago showed that the average mileage driven last year was 10.8 thousand miles. Does this indicate that the average miles driven per vehicle in Chicago is different from (higher or lower than) the national average? Use a 0.05 level of significance.
What is the value of the sample test statistic? (Round your answer to two decimal places.)
Find the P-value. (Round your answer to four decimal places.)
The shell thicknesses of the eggs produced by a large flock of hens follow approximately a normal distribution with mean equal to 0.38 mm and standard deviation equal to 0.03 mm. Find the 95th percentile of the thickness distribution.
Is there sufficient evidence to support the claim that site has an effect on the amount of pesticide?
As a part of their testing program Sony tests samples of 25 batteries. What can you say about the shape of the distribution of sample mean?
Formulate the hypotheses to test to see if the mean of the population is at least 12 ounces.
iq scores in a certain population are normally distributed with a mean of 95 and a standard deviation of 13. give your
the company explains that although this proportion is lower than it might wish its not a surprising value given that
1. what is the probaility that the weather in sydney will be bewteen 75 and 85 degree?2. you are aware that for iq mean
question the mcdougal sandwich shop has two windows available for serving customers who arrive at a poisson rate of
A sample of 81 observations is taken from a normal population. The sample mean is 40, and the sample standard deviation is 5. Determine the 95 percent confidence interval for the population mean.
How many participants need to be enrolled in each group to achieve 80% power using a two-sided test with significance level =.05
in the past the standard deviation of weights of certain 32.0-oz packages filled by a machine was 0.25 oz. a random
At a food processing plant, a machine produces 10 lb bags of sugar. In this particular process, it is important that the sugar content does not go below 9.9 lbs. In fact, when the bags of sugar are less than 9.9 lbs, maintenance is performed..
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