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Quiz



This activity contains 15 questions.

Question 1.
Continuous variables differ from discrete variables in that:

 
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Question 2.
If a value is equally likely to occur anywhere in the range between the smallest value of a and the largest value b, the data follows a __________.

 
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Question 3.
The normal distribution is important in statistics because:

 
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Question 4.
The ability to transform a value to a(n) ________________ allows statisticians to use one table for all normally distributed random variables.

 
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Question 5.
The graphical method for evaluating whether a particular variable is approximately normally distributed is the normal __________ plot.

 
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Question 6.
If a right skewed variable is transformed using natural logarithms and the transformed values are normally distributed, the result is a ____________ distribution.

 
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Question 7.
A variable follows an exponential distribution and is known to have a standard deviation of 12, give the mean.

 
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Question 8.
The standard deviation of the sampling distribution of the mean is also referred to as the __________.

 
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Question 9.
If 25 samples of 30 observations are drawn from a left-skewed population, the resulting sampling distribution of the mean will:

 
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Question 10.
Given a sampling distribution of a proportion with a mean of 0.15, for a constant sample size of 50, find the standard normal score for the sample proportion of ch05-10a.gif .

 
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Question 11.
A statistician has found that the amount of rainfall a specific region receives in a year follows an exponential distribution with a mean of 22. What is the probability that the region will receive less than 20 inches of rain next year?

 
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Question 12.
A variable is exponentially distributed. The probability that ch05-12a.gif is 68.33%. Calculate the variance for the distribution.

 
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Question 13.

Suppose a researcher wants to determine the interval around the mean of a population (ch05-13a.gif, ch05-13b.gif) that would include the middle 95 percent of the means based on samples of ch05-13c.gif. Give the interval.
 
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Question 14.
Given that a variable is uniformly distributed between 1146.7 and 5213.4, calculate the expected value.

 
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Question 15.
For a ___________ plot, the ordered array of observed scores and the z scores of a normally distributed variable will yield a straight line.

 
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