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Consider random samples of size 800 from a population with proportion 0.60.
(a) Find the mean and standard error of the distribution of sample proportions.
Round your answer for the mean to two decimal places, and your answer for the standard error to three decimal places.
(b) Is the sample size large enough for the Central Limit Theorem to apply?
Yes
No
What value of Cronbach's alpha coefficient indicates acceptable interitem reliability?- Why are researchers sometimes not able to test the reliability of their measures?
In the previous problem, the length of the confidence interval for µ is 257.6 - 200.7 = 56.9 and the length based on the trimmed mean is 244.9 - 196.7 = 48.2. Comment on why the length of the confidence interval for the trimmed mean is shorter.
Evaluate the strength of the relationship by computing the coefficient of determination.
Men's weights are normally distributed with mean 170 pounds and standard deviation 20 pounds.
The stock of Pills Berry Company is currently selling at $80 per share. The firm pays a dividend of $3.30 per share.
a. What is the mean number of suggestions for the sample? b. What is the standard deviation of the sample?
Implantable heart pacemakers contain small circuit boards called substrates. These substrates are assembled, cut to shape, and fired. Some of the substrates will separate, or delaminate, making them useless.
At a large university, the probability that a student takes Calculus and Statistics in the samesemester is 0.0125.
Translate the following arguments into symbolic notation.- If Mexico does not get its population growth under control, then its unemployment problem will never be solved. Mexico's unemployment problem will never be solved.
Find the power of the test designed to determine if the the new safety equipment is effective when the mean percent reduction is actually 2.3%. Assume that the population standard deviation is 12% and that α is 0.02. What is the power?
What fraction of the eggs produced by these hens weigh more than 62 grams?- What's the probability that a dozen randomly selected eggs average more than 62 grams?
Random sample of 250 americans is selected, the mean of this sample belongs to a sampling distribution. What is the shape of this sampling distribution?
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