The normal probability distribution is important because a large number of random variables observed in nature possess a frequency distribution that is approximately a normal probability distribution.
Indicate whether the statement is true or false
Q. 2The z-value needed to construct a 97.8 confidence interval estimate for the difference between two population proportions is:
a. 2.33
b. 2.29
c. 2.02
d. 1.96
e. 1.65
Q. 3Which of the following tests would be an example of nonparametric method?
a. The sign test
b. The Mann-Whitney U test
c. The runs test
d. All of the above.
Q. 4The total area under the curve f(x) of any continuous random variable x is equal to one.
Indicate whether the statement is true or false
Q. 5If we wish to construct a 95 confidence interval estimate for the difference between two population proportions, then the confidence level would be:
a. 1.96
b. 0.475
c. 0.95
d. 0.05
e. 2.33
Q. 6When choosing between parametric and nonparametric tests, we are interested primarily in
a. the control of error.
b. the relative power of the test.
c. efficiency.
d. All of the above.
Q. 7The relative frequency associated with a particular class in the population is the probability of drawing a measurement from that class.
Indicate whether the statement is true or false
Q. 8If a 90 confidence interval estimate for the difference between two population proportions is to be constructed, then the confidence coefficient would be:
a. .10
b. .90
c. .05
d. .45
e. .35
Q. 9Nonparametric tests can be appropriate when:
a. one or more of the assumptions underlying a particular parametric statistical test has been violated.
b. the sample size is very large.
c. the underlying population can be assumed to be normally distributed.
d. all assumptions for a particular parametric statistical test have been met.
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