Module Five Problem Set Questions T-Tests

Jason Wilkerson

SNHU

October 4, 2014

QUESTION 1

SPSS output:

Results write-up:

An independent samples t-test was run to determine whether the recall of colors is affected by vividness of visual imagery. The study established that there are 15 participants who had a vivid visual imagery and they had on average 12.53 number of colors recalled with a standard deviation of 4.596. There are 15 participants with less vivid visual imagery, and had, on average 8.13 number of colors recalled with a standard deviation of 4.015.

The significance of Levene’s test is 0.495 which is greater than our alpha, 0.01, and thus we assume the variables are equal with a t value of 2.792 with 28 degrees of freedom. The two tailed mean value associated with the test is 0.009 which is less than the alpha 0.01 and thus we can affirm the null hypothesis that suggests vividness of visual imagery does not enhance recall of colors. An equal variances t test failed to reveal a statistically reliable difference between the mean number of participants with vivid visual imagery and less vivid visual imagery.

Some of the limitations that deter me from concluding that the visual imagery causes improved color recall include: the significance of Levene’s test is higher than our alpha which prompts us to support the null hypothesis that suggests otherwise.

QUESTION 2

SPSS output:

Results write-up:

The mean of the traditional method is 76.88 with a standard deviation of 10.274 for 8 students. The average for 8 students who took the new method is 85.38 with a standard deviation of 11.550.

The 99% confidence interval for the population difference of the two teaching methods is 0.055. This means that there is no statistically significant difference between the two teaching methods since the significance 2-tailed is greater than 0.01. Hence the difference between the scores is not as a result of change in method.