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Suppose we rolled a pair of fair dice and count the number of dots located and the face that lands up. Describe this probability distribution. What is the probability of rolling less than a 6.
Explain the difference between testing a single mean and testing the difference between two means. What two assumptions must be met when one is using z test to test differences between two means?
Conduct a hypothesis test. What is the p-value and how much evidence is there to conclude that the power plants cooling system is not working properly.
Using the .05 level, what should the researcher conclude? Solve this problem explicitly using all five steps of hypothesis testing.
A genetic experiment with peas resulted in one sample of offspring that consisted of 438 green peas and 159 yellow peas.
In May 1998, the New York Times carried an article by Adam Bryant describing a research project to relate two rather diverse phenomena: the performance of a Fortune 500 company, and the golf game of its CEO. Before we go further, you should read this..
1.a researcher was interested in determining whether incentives and how they were offered affected the response rate in
An article in Parenting magazine reported that 60% of Americans needed a vacation after visiting their families for the holidays. Suppose this is the true proportion of Americans who feel this way. A random sample of 100 Americans is taken.
dave drives to work each morning at about the same time. his commute time is normally distributed with a mean of 35
It is the gallons of water processed at a plant, and the amount of lead removed from the water. A. Make a scatterplot to determine what kind of relationship there seems to be between the two variables. Use the percent of lead removed as the respon..
a certain airplane has two independent alternators to provide electrical power. the probability that a given alternator
On a test, a sample of 5 students has a mean score of 78. The scores of four students of them are: 87, 81, 76, 53. Find the test score of the fifth student and standard deviation of this sample.
a set of observations follow a normal distribution with mean 40 and standard deviation 4. what proportions of
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