A sample of 10 students takes a test first online and then on paper. A researcher...
A sample of 10 students takes a test first online and then on paper. A researcher compares students’ performance when a test is given online and performance when the test is on paper. The analysis shows the following data: = 1.7; sD = 1.49; t = 3.61. What is the effect size of the difference as measured by Cohen’s d?
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A sample of 10 students takes a test first online and then on
paper. A researcher...
1 A researcher wants to find out which type of classroom instruction significantly improves students’ test...
1 A researcher wants to find out which type of classroom instruction significantly improves students’ test performance. He designed four types of instruction for four samples of students. Later all four samples were given the same test and their average performance was compared. What statistical test should be used by the researcher to analyze the results of this study? A. Pearson correlation B. t-test for independent groups C. one-factor Anova for between groups D. Chi2 for Independence 2 A researcher...
A research company is claiming that 75% of college students shop online. Jamila takes a sample...
A research company is claiming that 75% of college students shop online. Jamila takes a sample of 200 college students and finds that 120 college students shop online. Which type of inference test should Jamila use? a.) Chi-squared test for homogonelty b.) Two-way ANOVA c.) One-sample t-test d.) One proportion z-test
A researcher would like to examine how the chemical tryptophan, contained in foods such as turkey,...
A researcher would like to examine how the chemical tryptophan, contained in foods such as turkey, can affect mental alertness. A sample of n = 8 college students is obtained, and each student’s performance on a familiar video game (total points earned in the game) is measured before and after eating a traditional Thanksgiving dinner including roast turkey. The following table are the scores for each participant before and after the meal: Participants: 1,2,3,4,5,6,7,8, Before Meal (X1): 220,245,215,260,300,280,250,310 After Meal...
6. A researcher wishes to test the effect of early discharge of cardiac patients on their...
6. A researcher wishes to test the effect of early discharge of cardiac patients on their ability to cope at home. The researcher administers the coping scale to 10 cardiac patients who were discharged early and 10 patients who stayed in the hospital for a longer period of time. Higher scores indicate better coping. Based on the data given in the table below, can you conclude that early discharge has an effect on cardiac patients’ on ability to cope at...
A researcher is testing the effect of a new medication for depression. A sample of n...
A researcher is testing the effect of a new medication for depression. A sample of n = 9 college students is obtained and each student is given a normal dose of the medicine for a period of four weeks. Following this, each student’s level of depression is measured using a standardized instrument used to screen for major depressive disorder. The scores on this instrument for the nine students are as follows: 5, 7, 9, 5, 6, 12, 4, 4, 2. ...
2) A researcher for a cereal company wanted to demonstrate the health benefits of eating oatmeal....
2) A researcher for a cereal company wanted to demonstrate the health benefits of eating oatmeal. A sample of 9 volunteers was obtained and each participant ate a fixed diet without any oatmeal for 30 days. At the end of the 30-day period, cholesterol was measured for each individual. Then the participants began a second 30-day period in which they repeated exactly the same diet except that they added 2 cups of oatmeal each day. After the second 30-day period,...
in comparing the engagement levels of first-year statistics students. In a previous nation-wide study, engagement levels...
in comparing the engagement levels of first-year statistics students. In a previous nation-wide study, engagement levels were found to be normally distributed, with µ=60.00, σ=10.00. The lecturer collects a convenience sample of 50 first-year students and finds that her students have a mean engagement level equal to 75.54. What statistical procedure should be used, to test whether there is a significant mean difference in engagement levels between the lecturer’s first year students and the population average? a. One sample Z-test....
PLEASE help ?? A researcher conducted a single sample t-test on results of an experiment with...
PLEASE help ??
A researcher conducted a single sample t-test on results of an experiment with n = 18 participants and the computed t = -2.28. What is the correct conclusion from this experiment if p < 0.05, 2-tails test is used for hypothesis testing? O A. The researcher failed to reject the null hypothesis and concluded that there is a significant treatment effect. O B. The researcher rejected the null hypothesis and concluded that there is a significant treatment...
Imagine that a researcher is conducting a paired-samples t test. She finds that the sample mean...
Imagine that a researcher is conducting a paired-samples t test. She finds that the sample mean difference is 5, the standard deviation of the difference scores is 15, and the sample size is 85. The researcher is also using a typical null hypothesis that proposes no differences between the relevant population means. Under these circumstances, what is the value of the paired-samples t statistic? Please retain a minimum of three decimal places for all steps (if relevant) and provide a...
A researcher records academic performance on students, given old and new teaching rubrics. She had hypothesized...
A researcher records academic performance on students, given old and new teaching rubrics. She had hypothesized that student performance (GPA) would improve when the students were introduced to the new teaching technique. If she uses a related samples t-test to test this hypothesis at .01 level of significance, then what will be the decision if she computes t = 3.459 in a sample of 30 participants? a) Retain the null hypothesis. b) Reject the null hypothesis. c) A decision cannot...
A research company is claiming that 75% of college students shop online. Jamila takes a sample of 200 college students and finds that 120 college students shop online. Which type of inference test should Jamila use? a.) Chi-squared test for homogonelty b.) Two-way ANOVA c.) One-sample t-test d.) One proportion z-test
PLEASE help ??
A researcher conducted a single sample t-test on results of an experiment with n = 18 participants and the computed t = -2.28. What is the correct conclusion from this experiment if p < 0.05, 2-tails test is used for hypothesis testing? O A. The researcher failed to reject the null hypothesis and concluded that there is a significant treatment effect. O B. The researcher rejected the null hypothesis and concluded that there is a significant treatment...
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