Question

The Davidson Trauma Scale (DTS; Davidson, 1997) is a self-report instrument that indicates the presence and severity of trauma symptoms. It is often used to detect PTSD, with scores ranging from 0 to 136, and a mean in the general population of 11 (Davidson, Tharwani, and Connor, 2002). A clinical psychologist is interested in measuring trauma in a sample of paramedics at the hospital where she works. Using the data in the table below, set up your data file in SPSS and conduct a one-sample t test to determine whether this sample scores higher than general population on the DTS. Create a histogram to display the distribution of the sample’s DTS scores.

One-Sample Statistics
	N	Mean	Std. Deviation	Std. Error Mean
Scores	16	40.9375	25.02923	6.25731

One-Sample Test
	Test Value = 11
	t	df	Sig. (2-tailed)	Mean Difference	95% Confidence Interval of the Difference
					Lower	Upper
Scores	4.784	15	.000	29.93750	16.6004	43.2746

1. Write an APA-style Results section based on your analysis. Include your histogram as an APA-style figure as demonstrated in the APA writing presentation. (Results = 8 pts; Graph = 5 pts)

Answer 1

The hypothesis being tested is:

H₀: µ = 11

H_a: µ > 11

The p-value is 0.000.

Since the p-value (0.000) is less than the significance level (0.05), we can reject the null hypothesis.

Therefore, we can conclude that this sample scores higher than the general population on the DTS.