When we test for differences between the means of two independent populations, we can only use a ...

When we test for differences between the means of two independent populations, we can only use a two-tailed test.
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Q. 2

Which of the following correctly describes a continuous random variable?
 a. We cannot list all the possible values of a continuous random variable.
  b. We cannot list all the probabilities for each one of the infinite number of conceivable values of the variable.
  c. We commonly associate probabilities with ranges of values along the continuum of possible values that the random variable might take on.
  d. All of these.
  e. None of these.

Q. 3

In testing the difference between two population means using two independent samples, the population standard deviations are assumed to be known, and the calculated test statistic equals 2.75 . If the test is two-tail and 5 level of significance has been specified, the conclusion should be not to reject the null hypothesis.
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Q. 4

Continuous random variables that can assume values at all points on an interval of values, with no breaks between possible values, are quite common. Examples include:
 a. profit per dollar of sales
  b. cost per credit taken by graduate students
  c. the average time it takes to assemble a car, or write a test
  d. height
  e. all of these

Q. 5

A political analyst in Iowa surveys a random sample of registered Democrats and compares the results with those obtained from a random sample of registered Republicans. This would be an example of two independent samples.
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Q. 6

Which of the following statements about continuous random variables is correct?
 a. They can assume values at all points on an interval with no breaks between possible values.
  b. We can gauge the likely occurrence of specific values of such variables with the help of one or another of certain probability distributions, including the binomial, Poisson, or hypergeometric distributions.
  c. They are defined at specific values.
  d. All of these.
  e. None of these.

Q. 7

Independent samples are those for which the selection process for one is not related to the selection process for the other.
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Q. 8

Many different types of continuous random variables give rise to a large variety of probability density functions, including:
 a. the binomial probability distribution
  b. the hypergeometric probability distribution
  c. the normal probability distribution
  d. the Poisson probability distribution
  e. both the binomial probability distribution and the hypergeometric probability distribution

Q. 9

The significance level in a hypothesis test for the difference between two population means is the same as the probability of committing a Type I error.
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