Question

In: Statistics and Probability

a. all Hypothesis Tests must include all four steps, clearly labeled; b. all Confidence Intervals must...

a. all Hypothesis Tests must include all four steps, clearly labeled;

b. all Confidence Intervals must include all output as well as the CI itself

c. include which calculator function you used for each problem.

3. At a community college, the mathematics department has been experimenting with four different delivery mechanisms for content in their Statistics courses. One method is traditional lecture (Method I), the second is a hybrid format in which half the time is spent online and half is spent in-class (Method II), the third is online (Method III), and the fourth is an emporium model from which students obtain their lectures and do their work in a lab with an instructor available for assistance (Method IV). To assess the effective of the four methods, students in each approach are given a final exam with the results shown in the following table. Assume an approximate normal distribution for each method. At the 5% significance level, does the data suggest that any method has a different mean score from the others?

Method I 81 81 85 67 88 72 80 63 62 92 82 49 69 66 74 80
Method II 85 53 80 75 64 39 60 61 83 66 75 66 90 93
Method III 81 59 70 70 64 78 75 80 52 45 87 85 79
Method IV 86 90 81 61 84 72 56 68 82 98 79 74 82

Solutions

Expert Solution

Data

Ho: µ1 = µ2= µ3 = µ4

Ha: at least one mean is different

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