Study 1. On a spatial skills task, normative data reveal that people typically g
ID: 3152589 • Letter: S
Question
Study 1. On a spatial skills task, normative data reveal that people typically get µ = 15 correct solutions. A rehabilitation psychologist tests n = 8 individuals who have brain injuries in the right cerebral hemisphere. Use the data presented below to determine whether right-hemisphere damage has significantly reduced performance on the spatial skills task. Lower score indicate poorer spatial performance. Test whether or not the performance of this sample is significantly lower than the normal population using the proper t-test. Here are the data:
Spatial skills scores: 14, 16, 13, 12, 14, 11, 15, 15
1. Identify the:
IV Individuals who have brain inuries in the right cerebral hemisphere. DV Reduced performance on the spatial skills task
2. Is it one-tailed or two-tailed? One Tailed
3. State Hypotheses mathematically: H0: u=15 H1: u15
4. State Hypotheses in words:
H0: ______________________________________________________________________
H1: ______________________________________________________________________
5. Run the proper t-test using SPSS. Write a paragraph in APA-style to summarize the results of this study.
Explanation / Answer
Set Up Hypothesis
Null, H0: U=15
Alternate, H1: U<15
Test Statistic
Population Mean(U)=15
Sample X(Mean)=13.75
Standard Deviation(S.D)=1.669
Number (n)=8
we use Test Statistic (t) = x-U/(s.d/Sqrt(n))
to =13.75-15/(1.669/Sqrt(8))
to =-2.118
| to | =2.118
Critical Value
The Value of |t | with n-1 = 7 d.f is 1.415
We got |to| =2.118 & | t | =1.415
Make Decision
Hence Value of | to | > | t | and Here we Reject Ho
P-Value :Left Tail -Ha : ( P < -2.1184 ) = 0.03595
Hence Value of P0.1 > 0.03595,Here we Reject Ho
[ANSWER]
2. ONE TAILED
3. u=15 H1: u<15
4. Ho: performance of this sample no significance to the normal population
H1: performance of this sample is significantly lower than the normal population
5.
We conclude that performance of this sample is significantly lower than the normal population