Problem A statistics professor wished to determine whether students devote equal amounts of preparation time to in-class and take-home final examinations (each student can have only one final exam). A study?was conducted, using 14 member random samples. When preparing for an in-class final examination, the participants devoted an average of 17.2 hours with a standard deviation of 4.3 hours. For the take-home final examination, the mean was 21.8 hours with a standard deviation of 3.6 hours. Question Is the hypothesis one-tailed or two-tailed (what type of hypothesis)?
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A. |
one-tailed hypothesis |
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B. |
two-tailed hypothesis |
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C. |
null hypothesis |
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D. |
directional hypothesis |
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E. |
Both B and C are correct |
In order to test for differences in the effects of five diet programs, the researcher recruited 60 people who wished to reduce their weight. They were randomly assigned to five groups. Each group met on a regular basis and each group was taught different techniques for weight loss. The dependent variable was the weight loss for the individual participant. The question was Is there a significant difference in the effects due to the different techniques??
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A. |
t test for dependent samples |
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B. |
one-sample t test |
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C. |
t test for independent samples |
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D. |
one-way ANOVA |
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E. |
Pearson?s correlation coefficient |
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F. |
coefficient of determination (COD) |
Problem
A university professor proposes to implement an experimental course that she believes may help statistics comprehension in graduate students. To evaluate the ?effectiveness? of the course (the professor is not sure whether the course will help or hurt student comprehension), the professor administers a pretest to the experimental group prior to the course. After the course is finished, the professor administers the same exam again (i.e., a posttest). Scores on the tests are graded and reported as follows:
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Problem 1 Data Set |
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Pretest Scores |
Posttest Scores |
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100 |
99 |
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65 |
87 |
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74 |
80 |
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97 |
99 |
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95 |
88 |
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75 |
75 |
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91 |
104 |
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107 |
81 |
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66 |
77 |
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101 |
87 |
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94 |
75 |
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88 |
70 |
Question
What is the most appropriate statistic to use to solve this problem?
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A. |
t test for dependent samples |
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B. |
one-sample t test |
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C. |
t test for independent samples |
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D. |
one-way ANOVA |
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E. |
Pearson?s correlation coefficient |
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F. |
correlation of determination (COD) |
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A statistics professor wishes to determine whether students devote equal amounts of preparation time to in-class and take-home final examinations (each student can have only one final exam). A study is conducted, using 14 member random samples. When preparing for an in-class final examination, the participants devoted an average of 17.2 hours, with a standard deviation of 4.3 hours. For the take-home final examination, the mean was 21.8 hours, with a standard deviation of 3.6 hours. Question What is the most appropriate statistic to answer the question?
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A. |
t test for dependent samples |
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B. |
one-sample t test |
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C. |
t test for independent samples |
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D. |
one-way ANOVA |
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E. |
Pearson?s correlation coefficient |
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F. |
coefficient of determination (COD) |
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Problem A university professor proposes to implement an experimental course he developed that increases statistics comprehension in graduate students. To evaluate the ?effectiveness? of the course, the professor administers a pretest to the experimental group prior to the course. After the course is finished, the professor administers the same exam again (i.e. a posttest). Scores on the tests are graded and reported as follows:
Question Is there a significant statistical difference (p < .05) between the two groups?
10 points Problem A university professor proposes to implement an experimental course he developed that increases statistics comprehension in graduate students. To evaluate the ?effectiveness? of the course, the professor administers a pretest to the experimental group prior to the course. After the course is finished, the professor administers the same exam again (i.e., a posttest). Scores on the tests are graded and reported as follows:
Question Interpret and apply the results of the statistical findings t(11) = 0.61, p = 0.2760. Pay particular attention to the mean score of each group. Select the choice that provides the correct interpretation.
20 points
Problem A university professor proposes to implement an experimental course he developed that increases statistics comprehension in graduate students. To evaluate the ?effectiveness? of the course, the professor administers a pretest to the experimental group prior to the course. After the course is finished, the professor administers the same exam again (i.e. a posttest). Scores on the tests are graded and reported as follows:
Question Use the Excel statistics spreadsheet and calculate the value of the t statistic. Provide your answer to two significant digits (e.g., 0.04).
Problem Sam Sawyer measured the 15 members of his track team on their speed running of the 100 meter dash. He also measured the heights of each team member. Sam wished to measure the relationship between height and speed on the 100 meter run. Question What is the most appropriate statistic to answer the question?
Problem A statistics professor wishes to determine whether students devote equal amounts of preparation time to in-class and take-home final examinations (each student can have only one final exam). A study is conducted, using 14 member random samples. When preparing for an in-class final examination, the participants devoted an average of 17.2 hours, with a standard deviation of 4.3 hours. For the take-home final examination, the mean was 21.8 hours, with a standard deviation of 3.6 hours. Question Is the hypothesis one-tailed or two-tailed (null or directional hypothesis)?
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