You may complete this assignment in pairs. (Remember, a “pair” consists of exactly two people.) Be sure to write both your names on the assignment, or you will receive no credit.
Short Answer
1. What does a one-sample t-test measure, and how is it different from a z-test? (3 points)
2. What is standard error? How is it different from standard deviation? (3 points)
SPSS Problems
For SPSS problems, you will produce a full APA-style write-up of the results that clearly explains your hypothesis and findings. Be sure to proofread, and use proper APA format with respect to decimal places (2, except for p-values), italics, etc. Use the provided examples as a guide. Note: you should include a copy of your statistical output for
all
of the analyses.
1. The New Zealand Air Force needs to buy new helmets for their pilots, so they need to know if their pilots have larger heads than the average pilot. The average pilot’s head is 150.5 cm. The Air Force measured 18 recruits using metal calipers and then again using cardboard calipers. For the following questions, use the NZHelmet.sav dataset.
a. Were the NZ pilots’ heads larger than the average pilot’s head size when the metal calipers were used? Write out results using proper APA format as demonstrated in the guide. (8 points)
b. Were the NZ pilots’ heads larger than the average pilot’s head size when the cardboard calipers were used? Write out results using proper APA format as demonstrated in the guide. (8 points)
2. The average brain weight of adults is 1,345 grams, and the average head size is 3,675 cubic centimeters (cm3). A researcher collected the brain weights of 237 individuals in Indiana, PA to see if their brain weight was different from the average brain weight. Use the dataset HeadSize.sav for the following questions.
a. Were the brain weights of Indiana, PA residents different from the global average? Write out results using proper APA format as demonstrated in the guide. (8 points)
b. Were the head sizes of Indiana, PA residents different from the global average? Write out results using proper APA format as demonstrated in the guide. (8 points)
3. Researchers are interested in whether individuals who eat more than 1,000 additional calories a day than their bodies need over the course of 8 weeks gain any weight at all. The researchers collected the participants’ weight at the beginning of the 8 weeks and again at the end of the 8 weeks. Use the dataset Overeating.sav for the following questions.
a. Identify the null and research hypotheses. (2 points)
b. Did the participants experience a significant amount of weight gain? Write out results using proper APA format as demonstrated in the guide. (8 points)
Copy and paste all of your output to the end of this lab. Grading will be based on accurate analysis of the results and proper APA-style write-up. (2 points)
Ftaen
T-TestLab4.docx
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