A nbsp develop a 95 confidence interval for the difference

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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

 

Reference no: EM13476912

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