question 6
Is it a good idea to listen to music when studying for a final exam test? Does it matter what music you listen to? A researcher conducted a study. He worked with two independent samples, a random sample 1 of 45 students who were asked to listen to music by Beethoven and another random sample 2 of 99 students who were asked to listen to Hip-Hop music while attempting to memorize objects pictured on a page. They were then asked to list all the objects they could remember (memory score). Here are the summary statistics for each group: the sample means are #1 = 10.0 for sample 1 and #2 = 9.0 for sample 2. Suppose that the population standard deviations are o1 = 1.5 and o2 = 1.8 are available. Could the researcher claim at a 4% level of significance that on average, there is no significant difference in memory score depending on the type of music students listen to? Use the z-test for two independent samples and the formula, (71 - 2) - (#1 - #2) (a) State the null and alternative hypotheses, and identify which one is the claim. Ho: Select an answer ? C H1: Select an answer C ? Which one is the claim? OHo OH (b) Find the critical value(s). In the first box please indicate the sign (s), and in the second box enter the numeric value. Use the following table of z values for most common a values.Use the following table of z values for most common a values. 0.005 0.01 0.02 0.03 0.04 0.05 0.06 0.1 Za 2.575 2.33 2.05 1.88 1.75 1.645 1.555 1.28 za 2.81 2.575 2.33 2.17 2.05 1.96 1.88 1.645 Critical Value(s) = ? (c) What is the test statistic? Use the correct sign for the test statistic and round your answer to 3 decimal places. (d) Does the test statistic fall into rejection region? ?= (e) What is the short version of your conclusion (in terms of Ho and H1)? Support Ho and support H1 (claim) Fail to reject Ho (claim) and fail to support H1 Fail to support Ho and reject H1 (claim) Reject Ho and fail to support H1 (claim) Reject Ho (claim) and support H1 (f) Select the correct statement. I have an evidence that the average memory score of students who listen to music by Beethoven is higher than the average memory score of students who prefer Hip-Hop music. At a 4% level of significance, there is sufficient evidence to warrant rejection of the claim that on average, there is no significant difference in memory scores of students who listen to music by Beethoven and students who prefer Hip-Hop music. I proved that the average memory score of students who listen to music by Beethoven is lower than the average memory score of students who listen to Hip-Hop music. At a 4% level of significance, there is not sufficient evidence to warrant rejection of the claim that on average, there is no significant difference in memory scores of students who listen to music by Beethoven and students who prefer Hip-Hop music
