Answer the questions below, following the Submission Requirements as specified at the end of the assessment. To calculate t when needed, refer to the T-Table for Assessment 4 document linked in the Resources under the Required Resources heading.
Question | Topic |
---|---|
Question 1 | Standard Error of the Difference Between the Means |
Question 2 | Standard Error of the Difference Between the Means |
Question 3 | SPSS: Independent Samples t Test |
Question 4 | SPSS: Independent Samples t Test |
Question 5 | t Test with Related Samples |
Question 6 | SPSS: Paired Samples t Test |
Question 7 | SPSS: Paired Samples t Test |
Question 8 | Confidence Intervals |
Question 9 | ANOVA Logic: Partitioning of Deviation Scores |
Question 10 | ANOVA Logic: From Mean Squares to F |
Question 11 | ANOVA Summary Table |
Question 12 | SPSS: One-Way ANOVA |
Question 13 | SPSS: One-Way ANOVA |
Question 14 | SPSS: Tukey HSD Test |
Question 15 | SPSS: Tukey HSD Test |
A researcher examines the results of two separate studies. In the first study, the difference between Group A and Group B is two points. However, the σ_{M1-M2} is large, and the difference is not significant. In the second study, the difference between Group A and Group B is also two points. However, the σ_{M1-M2} is small, and the difference is significant. What might be the reason for the difference in the σ_{M1-M2} across the two studies?
A researcher is examining the effects of a new anxiety drug. The σ_{M} for the experimental group (group receiving the antianxiety drug) is 1.4, while the σ_{M} for the control group is 1.22. Calculate the σ_{M1 – M2} .
Complete the following steps:
A VP for a large clothing retailer is convinced that handing out coupons to customers in the store will leader to higher sales. To test this, she has her sales associates randomly select customers to either receive or not receive a $10-off, today-only coupon. As each customer leaves the store, the amount of his or her purchase is recorded. The recorded data are in SPSS file assessment4b.sav linked in the Resources under the Required Resources heading.
Complete the following:
Identify whether independent samples were used, repeated measures were used, or matched samples were used in the following scenarios:
Complete the following steps:
A study was conducted on information retention in 40 students (20 pairs) after students conducted online research or watched a movie on a given topic. Students were matched on gender and age. Data provided in the SPSS file below represent quiz scores after students completed their studying.
Complete the following:
Refer back to your SPSS output from Assessment 4 Question 3. Based on that output, what is the 95 percent confidence interval of the difference?
Assume the within-group deviation is 108.45 and the between-group deviation is 48.68. Calculate the total deviation.
Assume MS_{bet} = 80 and MS_{with} = 20. What is F?
Answer questions a–d using the following ANOVA summary table:
SS | df | MS | F | |
---|---|---|---|---|
Between Groups | 283.32 | 4 | 70.83 | 8.16 |
Within Groups | 390.60 | 45 | 8.68 | |
Total | 673.92 | 49 |
Complete the following steps:
A teacher believes that kindergartners who attend school for a full day are more proficient readers than those children who attend for a half day or those who are homeschooled. At the end of the school year, she gives a reading test to 20 full-day kindergartners, 20 half-day kindergartners, and 20 home-schooled kindergartners. Data provided in the SPSS file assessment4f.sav below represent reading scores for each group:
Complete the following steps:
Complete the following steps:
Complete the following steps:
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