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##### WEB CALCULATOR EXERCISE 3

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solution

**Question**

Question;Web Calculator Exercise 3;T test for independent groups and;dependent groups (Two-group designs);1.;An LU professor is interested in whether;there is a difference between undergraduate students and graduate students in;the amount of time spent praying each day. The professor gathers information from;random samples of undergraduate and graduate students on the LU campus. The amount of time praying is normally;distributed and is measured on an interval/ratio scale.;Graduate;Undergraduate;15;9;17;11;10;9;13;6;11;5;17;6;a. What;statistical test should be used to analyze the data?;b. Is;this a one- or two tailed test?;c. Identify;H0 and Ha for this study.;d. Conduct;the appropriate analysis. Should H0 be rejected?;2.;A;teacher wants to investigate whether there is a difference between male and;female students in the amount of time they spend studying for statistics. The;table below shows the amount of time students spend studying statistics each;week. The amounts of time spent studying are normally distributed.;Male;Female;27;25;25;29;19;18;10;23;16;20;17;15;15;19;a. What;statistical test should be used to analyze the data?;b. Is;this a one- or two tailed test?;c. Identify;H0 and Ha for this study.;d. Conduct;the appropriate analysis. Should H0 be rejected?;3. A;researcher is interested in whether listening to music helps or hinders;test-performance. To control for differences in cognitive level, this;researcher decides to use a within-participants design. He selects a random;sample of participants and has them study different material of equal;difficulty in both the music and no music conditions. Participants take a 20-item quiz on the material. The table;below shows the scores on the quiz. The study is completely counterbalanced to;control for order effects. The scores;obtained are measured on an;interval-ratio scale and are normally;distributed.;Music;No Music;17;17;16;18;15;17;16;17;18;19;18;18;a. What;statistical test should be used to analyze the data?;b. Is;this a one- or two tailed test?;c. Identify;H0 and Ha for this study.;d. Conduct;the appropriate analysis. Should H0 be rejected? What should the;researcher conclude?;e. Calculate;the 95 confidence interval.

Paper#62475 | Written in 18-Jul-2015

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