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A random sample of six cars from a particular model has the following fuel consumption figure, in miles per gallon: 18, 16, 20, 21, 19, 17. Find a 95% confidence interval for the population mean. Assuming that the population is normal. ( use t-distribution for small sample size).
A (16.54, 20.46)
B (14.56, 19.44)
C (16.32, 21.68)
D (15.32, 20.68)
At 95% confidence using the p- value approach, test the hypotheses. Let α = 0.1.
The sample mean talk time was 315 minutes with a standard deviation of 24 minutes. Why can we say that the sampling distribution of x is approximately normal?
air enters a compressor with a pressure of 14.7 psia a temperature of 70 degreef and a volumetric flow rate of 40 ft3s.
The State Game Commission set on length, if it is desired that 91% of the fish caught may be kept by fisherpersons? There is no limit on size for trout that exceed the minimum.
Using the finite population correction factor, compute the standard error for each of the three firms given a sample of size 50.
What is the probability that both defective lights will be found within three trials?
last weeks sales of imac computers at an apple store in oklahoma city ok are shown in the following tabledaysales
the number of road accident victims reporting to a hospital emergency ward is shown in the following table. do these
The study does provide sufficient evidence to support the claim that less than 75% of college student spend less than $250 per semester on textbooks.
Assistant dean use a sample of application to determine whether the mean examination score for freshman application has changed. State the hypothesses.
Develop a test of hypothesis to determine if the mean time spent in the mall is more than 0.75 hours. Use the .05 significance level.
A researcher had the idea that background music might enhance performance on a math test and that the effect of music might depend on whether an individual is a music lover or not.
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