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A library dean is interested in whether students who study with music playing devote as much attention to their studies as do students who study under quiet conditions. He believes students who study with music do not devote as much attention to their studies as do students who study under quiet conditions. He randomly assigns the 20 subjects to either music or no music conditions and has them read and study the same passage of information for the same amount of time. Participants are then all given the same 10-item test on the material. Their scores appear next. Scores on the test represent interval-ratio data and are normally distributed. Variances are assumed equal. Use regular keyboard to type math symbols and replace Greek letters with equivalent English letters. Thus: alpha = a, mu = m, sample mean = x-bar, sigma = s, sample standard deviation = sd. Operators: =, <>, <, >, <=, >=, and +-. Hypotheses: H0:, Ha: Music No Music 4 10 6 6 5 7 5 8 8 10 6 6 7 8 7 9 5 9 5 8 Step 1. What statistical test should be used to analyze the data? A) Independent two-sample t Test; B) Dependent two-sample t Test Write A or B: Step 2. State the hypotheses: H0: Ha: Step 3. Find the value of the t test statistic. (Round your answer to 3 decimal places.) Answer: Step 4. Write the critical value of t from the table for appropriate degrees of freedom and alpha = 0.05, round to 3 decimals. Answer: Step 5. Determine the conclusion. A) Reject Null Hypothesis or B) Fail to Reject Null Hypothesis Answer, write A or B: Step 6. Determine the 95% Confidence Interval for the difference of means. Approximate to the nearest integer. Lower Bound = , Upper Bound =

A library dean is interested in whether students who study with music playing devote as much attention to their studies as do students who study under quiet conditions. He believes students who study with music do not devote as much attention to their studies as do students who study under quiet conditions. He randomly assigns the 20 subjects to either music or no music conditions and has them read and study the same passage of information for the same amount of time. Participants are then all given the same 10-item test on the material. Their scores appear next. Scores on the test represent interval-ratio data and are normally distributed. Variances are assumed equal. Use regular keyboard to type math symbols and replace Greek letters with equivalent English letters. Thus: alpha = a, mu = m, sample mean = x-bar, sigma = s, sample standard deviation = sd. Operators: =, <>, <, >, <=, >=, and +-. Hypotheses: H0:, Ha:
Music No Music
4 10
6 6
5 7
5 8
8 10
6 6
7 8
7 9
5 9
5 8
Step 1. What statistical test should be used to analyze the data? A) Independent two-sample t Test; B) Dependent two-sample t Test
Write A or B:
Step 2. State the hypotheses:
H0:
Ha:
Step 3. Find the value of the t test statistic. (Round your answer to 3 decimal places.)
Answer:
Step 4. Write the critical value of t from the table for appropriate degrees of freedom and alpha = 0.05, round to 3 decimals.
Answer:
Step 5. Determine the conclusion. A) Reject Null Hypothesis or B) Fail to Reject Null Hypothesis
Answer, write A or B:
Step 6. Determine the 95% Confidence Interval for the difference of means. Approximate to the nearest integer.
Lower Bound = , Upper Bound =

Added by Elisa A.

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