# T Tests for Independent and Related Samples: 6 problems

See attached file for clarity.

t Tests for Independent and Related Samples

Problem Set 2: Chapter 10 & 11: problems:

Chapter 10:

2. Describe what is measured by the estimated standard error in the bottom of the independent -measures t-statistic.
18. In 1974, Lotus and Palmer conducted a classic study demonstrating how the language used to ask a question can influence eyewitness memory. In the study, college students watched a filmed of an automobile accident and then were asked about what they saw. One group was asked, questions what they saw. One group was asked, “About how fast were the cars going when they smashed into each other?” Another group was asked the same question expect the verb was changed to hit” instead of smashed into” group reported significantly higher estimates of speed than the hit” group. Suppose a researcher repeats this study with a sample of today’s college students and obtains the following results.

Estimated Speed

Smashed into Hit
n = 15 n = 15
M = 40. 8 M = 34. 0
SS = 510 SS = 414

24. A researcher conducts an independent -measures research study and obtains t =2.070 with df = 28.
a. How many individuals participated in the entire research study?
b. Using a two-tailed test with α = .05, is there a significant difference between the two treatment conditions?
c. Compute r2 to measure the percentage of the variance accounted for by the treatment effect.

Chapter 11:
2. Participants enter a research study with unique characteristics that produce different scores from one person to another. For an independent -measure study, this individual difference can cause problems. Briefly explain how these problems are eliminated or reduced with a repeated -measure study.

4. A researcher conducts an experiment comparing two treatment conditions and obtains data with 10 scores for each treatment condition.
a. If the researcher used an independent-measure design how many subjects participated in the experiment?
b. if the researcher used a repeated-measures design, how many subjects participated in the experiment?
c. If the researcher used a matched -subjects design, how many subjects participated in the experiment?

10. Research has shown that losing even night’s sleep can have a significant effect on performance of complex tasks such as problem solving (Linde & Bergstroem, 1992). To demonstrate this phenomenon, a sample of n = 25 college students was given a problem- solving task at noon on one day and again at noon on the following day. The students were not permitted any sleep between the two tests. For each student, the difference between the first and second score was recorded. For this sample, the students averaged MD = 4.7. points better on the first test with a variance of s2 = 64 for the difference scores.
a. Do the data indicate a significant change in problem -solving ability? Use a tailed test with α = .05.
b. Compute an estimated Cohen’s d to measure the size of the effect.

22. In a Preview of a chapter, there is a discussion discussed as a report describing the Olympic and how marksmen can be affected by heartbeats. Pelton (1983) reported that Olympic -level marksmen shoot much better if they fire between heartbeats rather than squeezing the trigger during a heartbeat. The small vibration caused by a heartbeat seems to be sufficient to affect the marksmen’s aim. The following hypothetical data demonstrate this phenomenon. A sample of n = 8 Olympic marksmen fire a serious of rounds while a researcher records heartbeats. For each marksman, the total score is recorded for shots fired during heartbeats and for shots fired between heartbeats. Do these data indicate a significant difference? Test with α = .05.

Participants During heartbeats Between heartbeats
A 93 98
B 90 94
C 95 96
D 92 91
E 95 97

Calculate the price
Pages (550 words)
\$0.00
*Price with a welcome 15% discount applied.
Pro tip: If you want to save more money and pay the lowest price, you need to set a more extended deadline.
We know how difficult it is to be a student these days. That's why our prices are one of the most affordable on the market, and there are no hidden fees.

Instead, we offer bonuses, discounts, and free services to make your experience outstanding.
How it works
Receive a 100% original paper that will pass Turnitin from a top essay writing service
step 1
Fill out the order form and provide paper details. You can even attach screenshots or add additional instructions later. If something is not clear or missing, the writer will contact you for clarification.
Pro service tips
How to get the most out of your experience with AssignmentHelpWeb
One writer throughout the entire course
If you like the writer, you can hire them again. Just copy & paste their ID on the order form ("Preferred Writer's ID" field). This way, your vocabulary will be uniform, and the writer will be aware of your needs.
The same paper from different writers
You can order essay or any other work from two different writers to choose the best one or give another version to a friend. This can be done through the add-on "Same paper from another writer."
Copy of sources used by the writer
Our college essay writers work with ScienceDirect and other databases. They can send you articles or materials used in PDF or through screenshots. Just tick the "Copy of sources" field on the order form.
Testimonials
See why 20k+ students have chosen us as their sole writing assistance provider
Check out the latest reviews and opinions submitted by real customers worldwide and make an informed decision.
Job well done. Finish paper faster than expected. Thank you!
Customer 452451, October 3rd, 2022
Excellent service - thank you!
Customer 452469, February 20th, 2023
Psychology
Thanks a lot the paper was excellent
Customer 452453, October 26th, 2022
Nursing
The paper was EXCELLENT. Thank you
Customer 452449, September 23rd, 2022
Anthropology
Excellent services will definitely come back
Customer 452441, September 23rd, 2022
Thank you!
Customer 452451, November 27th, 2022
English 101
Very good job. I actually got an A
Customer 452443, September 25th, 2022
Anthropology
excellent loved the services
Customer 452443, September 23rd, 2022
Architecture, Building and Planning
The assignment was well written and the paper was delivered on time. I really enjoyed your services.
Customer 452441, September 23rd, 2022
Theology
Job well done and completed in a timely fashioned!
Customer 452451, November 18th, 2022
11,595
Customer reviews in total
96%
Current satisfaction rate
3 pages
Average paper length
37%
Customers referred by a friend
OUR GIFT TO YOU
15% OFF your first order
Use a coupon FIRST15 and enjoy expert help with any task at the most affordable price.
Claim my 15% OFF Order in Chat