Pet owners: 8 1 3 3 4 3 5 2 11 5 No-pets: 10 5 10 7 5 4 9 6 12 9 5 8 What is the design of this study? ____________________________ n = ____ people What is the IV? __________ What is the DV? _____________________ Is the hypothesis underlined above one-tailed or two-tailed? _______ State the Hypotheses in symbols and words: . H0: _____________ in words: H1: _____________ in words:
Pet owners: 8 1 3 3 4 3 5 2 11 5
No-pets: 10 5 10 7 5 4 9 6 12 9 5 8
- What is the design of this study? ____________________________ n = ____ people
- What is the IV? __________ What is the DV? _____________________
- Is the hypothesis underlined above one-tailed or two-tailed? _______
- State the Hypotheses in symbols and words: .
H0: _____________ in words:
H1: _____________ in words:
Create an Excel data file organized by IV and DV. Variables: 1) pet_ownership and 2) DR_visits.
(This time do not code pet_ownership as a dummy variable (1,2); instead, write pet or no pet as the
group categories in the Excel file.)
Open this dataset in JASP. Perform an Independent Samples t-test by selecting
T-Tests > Classical > Independent Samples t-test. Select DR_visits as the variable and pet_ownership as the grouping variable. Check off Location Parameter, 95% Confidence Interval, and Descriptives.
- Fill in the following from the Descriptives output table.
Pet owners Non-owners
Means of visits: ________________ _____________
Std. Deviation _______________ _____________
Std. Error of Mean _______________ _____________
Before we look at the results of the t-test, let’s plot the means and confidence intervals. Check off the Descriptives plots option below Additional Statistics. This creates a graph with the mean for each group plotted with bars out a distance that represents the 95% confidence interval for each group mean.
- Describe the graph in terms of the amount of overlap of the bars (e.g., approx percentage of overlap) ___________________________________
Now, let’s test the Equality of Variances between groups. Under Assumptions Check, check off the Equality of variances option. If the p-value is greater than .05 the variances are equal - use the student’s t-test value we already calculated. If p is less than .05, we will need to use the Welch t-test, which can be calculated by checking off Welch under Tests. Fill in the information below using the appropriate test:
- Is the assumption of the equality of variances met according to this test? _______
- Fill in these values from the tables:
t = ____________ df = ____________ Sig. or p level (2-tailed) = ______________ Mean Difference = ______________ Std. Error of Difference = _____________ 95% Confidence Interval is : ______ to ______.
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