Stat 200 Final Summer 2015 Upload (1)
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- True or False. Justify for full credit.
(a) If all the observations in a data set are identical, then the variance for this data set is zero.
(b) If P(A) 0.4 and P(B) 0.5, then P(A AND B) 0.2.
(c) The mean is always equal to the median for a normal distribution.
(d) A 95% confidence interval is wider than a 90% confidence interval of the same parameter.
(e) In a two-tailed hypothesis testing at significance level ? of , the test statistic is calculated as 2. If P(X 2) , then we have sufficient evidence to reject the null hypothesis.
Refer to the following frequency distribution for Questions 2, 3, 4, and 5. Show all work. Just the answer, without supporting work, will receive no credit.
A random sample of 100 students was chosen from UMUC STAT 200 classes....
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