Avoid rounding until you compute the CI-test(s). When you compute the CI-test(s), round to 4 decimal places. Researchers studied the effectiveness of learning about a new medication. One group of participants (n = 12) read a short paragraph describing the medication, while another group (n = 12) read the same paragraph but were also provided with a graph that depicted the data that they had read about. Both groups were asked to rate their perceived effectiveness of the medication. The reading only group had a mean of 6.25 (SS=28.25) and the reading-plus-graph group had a mean of 6.83 (SS=15.67). The researchers now want to use estimation procedures to draw conclusions about whether the perceived drug effectiveness differs between the two groups. For the procedures below think very carefully about the design of the study and what this means for the type of test you should use. Also pay close attention to which point estimate, df, and standard error formulas that should be used. 1. What is the correct formula for this type of design? 2. Compute the point estimate. 3. Compute the 80% confidence interval around the mean difference. Be sure to state your results in statistical notation. 4. Compute the 95% confidence interval around the mean difference. Be sure to state your results in statistical notation.
Avoid rounding until you compute the CI-test(s). When you compute the CI-test(s), round to 4 decimal places.
Researchers studied the effectiveness of learning about a new medication. One group of participants (n = 12) read a short paragraph describing the medication, while another group (n = 12) read the same paragraph but were also provided with a graph that depicted the data that they had read about. Both groups were asked to rate their perceived effectiveness of the medication. The reading only group had a mean of 6.25 (SS=28.25) and the reading-plus-graph group had a mean of 6.83 (SS=15.67). The researchers now want to use estimation procedures to draw conclusions about whether the perceived drug effectiveness differs between the two groups. For the procedures below think very carefully about the design of the study and what this means for the type of test you should use. Also pay close attention to which point estimate, df, and standard error formulas that should be used.
1. What is the correct formula for this type of design?
2. Compute the point estimate.
3. Compute the 80% confidence interval around the mean difference. Be sure to state your results in statistical notation.
4. Compute the 95% confidence interval around the mean difference. Be sure to state your results in statistical notation.
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