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Find the mean and standard deviation for the batting average for a player in the most recently completed MBL season. What batting average would separate the top 5% of all hitters from the rest? What is the probability that a randomly selected player bats over 0.300? What is the probability that a team of 25 players has a mean that is above 0.275?
Compute the z-score for M = 89 for a sample of n = 25 scores. Is this sample mean in the middle 95% of the distribution?
Is there evidence of difference in mean life of bulbs produced by the two kinds of machines. What is your conclusion?
Construct a 95% confidence interval for the proportion and calculate the P value for the given test.
A regional commuter airline selected a random sample of 25 flights and found that the correlation between the number of passengers and the total weight, in pounds, of luggage stored in the luggage compartment is 0.94.
For the most recent year available the mean annual cost to attend a private university in the US was $26,889. Assume the distribution of annual costs follows a normal probability distribution and the standard deviation is $4,500. 95% of all studen..
What is the probability that a randomly chosen employee is an Administrator if the employee has the opportunity of gaining promotion next year?
Discuss whether the percent distribution of the cross-tab and chi-square supports/does not support the researcher's hypothesis.
If the null hypothesis is true, then how much difference should be expected, on average, between the two sample means?
At least 14 units of B and no more than 20 units of A must be used. Each unit of A weighs 5 kg and each unit of B weighs 10 kg. How many units of each type of raw material requires?
What percentage of men are too tall to fit through a standard doorway without bending, and what percentage of women are too tall to fit?
An experiment is set to test the hypothesis that a given coin is unbiased. The decision rule is the following: Accept the hypothesis if the number of heads in a sample of 200 tosses is between 90 and 110 inclusive, otherwise reject the hypothesis.
The mean is a useful measure, but it can be misleading. Describe a circumstance when the mean is very useful as the average and a circumstance when the mean is very misleading as the average.
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