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Question 1. Consider the following results for two samples randomly taken from two normal populations with equal variances.
Sample I
Sample II
Sample Size
28
35
Sample Mean
48
44
Population Standard Deviation
9
10
a. Develop a 95% confidence interval for the difference between the two population means.
b. Is there conclusive evidence that one population has a larger mean? Explain.
Question 2. As a general guideline, the research hypothesis should be stated as the
null hypothesis
hypothesis the researcher wants to disprove
alternative hypothesis
tentative assumption
Question 3. As the degrees of freedom increase, the t distribution approaches the
uniform distribution
p distribution
exponential distribution
normal distribution
Question 4. Two approaches to drawing a conclusion in a hypothesis test are
p-value and critical value
Type I and Type II
one-tailed and two-tailed
null and alternative
Question 5. In hypothesis testing, the alternative hypothesis is
the maximum probability of a Type I error
All of the answers are correct
the hypothesis tentatively assumed true in the hypothesis-testing procedure
the hypothesis concluded to be true if the null hypothesis is rejected
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