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Assume there are 21 homes in the Quail Creek area and 9 of them have a security system. Six homes are selected at random:
What is the probability none of the six selected homes have a security system? (Round your answer to 3 decimal places.)
The mean age of a sample of 60 students from a class was found out to be 25.3 years. The variance in population age was 16 years.
A sample of 49 repairs showed an average overhaul of 285 hours with a standard deviation of 50 hours. Calculate a 95% confidence interval for the average overhaul.
A jar contains marbles of different colors: 4 white, 6 black, 6 red, and 4 blue. On two random drawings, without replacement, find the probability that the first is black and the second is white.
Assume that 60 percent of the voters in a particular region support a candidate. Find the probability that a sample of 1,000 voters will yield a sample proportion in favor of the candidate within 4 percentage points of the actual proportion.
Will the sum of squared deviation scores be greater for the test or the exam (assume the same number of people sat both the test and the exam)? Why?
Time spent using email per session is normally distributed with μ = 8 minutes and σ = 2 minutes. a) What is the probability that the sample mean is between 7.8 and 8.2 minutes?
The distribution of test scores is mui=35 and a standard deviation of 15. Do students taking the supplement have significantly better memory scores? Use a one-tailed t-test with an alpha=0.05.
Calculate the mean difference for the following data. The scores are the number of pictures the participants remembered correctly out of 20.
Entire batch will be rejected if at least one of those tested is defective. Determine the probability that entire batch will be rejected?
At the .05 significance level, is the number of units produced on the afternoon shift larger?
A delivery truck averages 15 miles per gallon, with a standard deviation of 3 miles per gallon, and that fuel consumption is Normally Distributed.
Gender differences in dream content are well documented (Winget & kramer, 1979). Suppose a researcher studies aggression content in the dreams of men and women.
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