22. Which of the following are valid conclusion(s)?S1:‘We are 95% sure that there is a substantial difference between first and thirdyear undergraduate students in terms of time spent on social networks.’S2:‘We are 95% sure thatμ1-μ3is between 2.4 and 7.6.’S3:‘We are 95% sure that ¯x1-¯x3is between 2.4 and 7.6.’S4:‘The probability thatμ1-μ3lies between 2.4 and 7.6 is 0.95.’
23. Suppose that a 95% confidence interval forμis (54.4, 60.4). Which of the following ismost likely thep-value for the test ofH0:μ=54 versusHa:μ6=54?
24. In an experiment, individual subjects are usually allocated to treatments using randomassignment. The reason for using random assignment is to
25. Increasing the significance level of a hypothesis test (say, from 5% to 10%) will cause thep-value of an observed test statistic to . . .A) increaseB) decreaseC) stay the sameD) become undeterminedE) hard to say without information on the sample size.
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