For a normal curve, if the mean is 20 minutes and the standard deviation is 5 minutes, the area to the right of 13 minutes is 0.9192.
Indicate whether the statement is true or false
Q. 2If we do not reject the null hypothesis, we conclude that:
a. there is not enough statistical evidence to infer that the alternative hypothesis is true
b. there is enough statistical evidence to infer that the alternative hypothesis is true
c. there is enough statistical evidence to infer that the null hypothesis is true
d. there is not enough statistical evidence to infer that the null hypothesis is true
e. the test is statistically insignificant at whatever level of significance the test was conducted at
Q. 3Which of the following statements is false regarding the runs test?
a. It is used most frequently to test the randomness of data (or lack of randomness).
b. Its test statistic is V, the number of runs observed.
c. It is generally a two-tailed test.
d. None of the above.
Q. 4For a normal curve, if the mean is 25 minutes and the standard deviation is 5 minutes, the area to the left of 10 minutes is about 0.50.
Indicate whether the statement is true or false
Q. 5A Type II error is committed when we:
a. reject a true null hypothesis
b. reject a false null hypothesis
c. don't reject a true null hypothesis
d. don't reject a false null hypothesis
e. do none of these
Q. 6Explain why a nonparametric test is not as sensitive to an extreme datum as a parametric test might be.
Q. 7A random variable x is normally distributed with a mean of 250 and a standard deviation of 50 . Given that x = 175, its corresponding z-score is 1.50.
Indicate whether the statement is true or false
Q. 8In a criminal trial, a Type I error is committed when:
a. a guilty defendant is acquitted
b. an innocent person is convicted
c. a guilty defendant is convicted
d. an innocent person is acquitted
e. a guilty defendant is convicted and an innocent person is acquitted
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