Two Samples Hypothesis Testing Worksheet Two Samples Hypothesis Testing Worksheet PSYC 2354 •A pet association claims that the mean annual costs of routine veterinarian visits for dogs and cats are...

Hypothesis with two samples


Two Samples Hypothesis Testing Worksheet Two Samples Hypothesis Testing Worksheet PSYC 2354 •A pet association claims that the mean annual costs of routine veterinarian visits for dogs and cats are the same. The results for samples of the two types of pets are shown below. At α=.10 can you reject the pet association’s claim? Assume the population variances are not equal. (Adapted from American Pet Products Association) Dogs Cats = 225 = 203 = 25 = 28 = 7 = 10 Step 1: State the hypotheses Step 2: Find the critical value(s) . Step 3 Compute the test statistic 3.1 Find the pooled variance 3.2 Find the standard error of the difference 3.3 Compute the test value = Step 4 Make the decision. Step 5 Summarize the results. Interpreting Output: Moon and Aggression Description: As part of a larger study of dementia patients, Moore et al (2012) was interested in the number of disruptive behaviors by dementia patients during two different phases of the lunar cycle (Moore et al, 2012, p. 410). Specifically, the authors examined the adequacy of the null hypothesis which states that the average number of disruptive behaviors among patients with dementia does not differ between moon days and other days. Use α = .05 Data: •Moon - The average number of disruptive behaviors during full moon days. •Other - The average number of disruptive behaviors during other days. Moore, D. S., McCabe, G. P., and Craig. B. A. (2012) Introduction to the Practice of Statistics (7th ed). New York: Freeman. # Continues in the next page >> Output: •This is an example of: •Independent samples t-test •Dependent samples t-test •State the pair of hypotheses •What would your conclusion be based on the P-value? •Reject the null hypothesis •Do not reject the null hypothesis •APA Style. Fill in the blank: The results of a _____________ t-test indicate that there is statistically significant evidence that the average number of disruptive behaviors during the full moon days (M = ___, SD = ___) compared to the average number of disruptive behaviors during other days M = ___, SD = ___), t(df = ___ ) =___ , p =___.