Winthrop University
Lab #4: Z-scores (rev. 9/28/2009)
|What’s the z-score formula for a score? |What’s the std error of the mean formula? [pic] |What’s the z-score formula for a sample mean? |
|[pic] | |[pic] |
|1. Susie Shwagenhaur scores 450 on the SAT (σ = 100, μ = |What percent of people should score above Susie? |Sketch the freq. distribution. Label with both raw|
|500). Calculate the z-score. |Show sketch. |and standard scores. |
|Circle: z-score for… score or sample mean? | |[pic] |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
|2. A fetal alcohol syndrome baby weighs 6.3 oz while |What percent of normal babies would weigh more? |Sketch the freq. distribution. Label with both raw |
|normal babies weigh 8 (σ =1). |Show sketch. |and standard scores. |
|Circle: z-score for… score or sample mean? | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
|3. A class of 25 students average 530 on the SAT (σ = |Do these students seem more or less intelligent |Sketch the sampling distribution. Label with both |
|100, μ = 500). |than normal? Test with α=.05 (zcrit = ± 1.96). |raw and standard scores. |
|Circle: z-score for… score or sample mean? |Show sketch. | |
| | |[pic] |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| |same intelligence | |
| | | |
| | | |
| |Circle: Reject or Retain H0 | |
|4. A group of nine crack babies average 7 oz while normal |Do these babies seem to weigh more or less than |Sketch the sampling distribution. Label with both |
|babies weigh 8 (σ =1). |normal? Test with α=.05 (zcrit = ± 1.96). Show |raw and standard scores. |
|Circle: z-score for… score or sample mean? |sketch. | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| |Circle: Reject or Retain H0 | |
|5. After taking statistics for therapy, a group of 25 |Do these students seem more or less depressed |Sketch the sampling distribution. Label with both |
|students average 48 on the depression inventory (μ = 50 and|than normal? Test with α=.05 (zcrit = ± 1.96). |raw and standard scores. |
|σ = 5). |Show sketch. | |
|Circle: z-score for… score or sample mean? | |[pic] |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| |Circle: Reject or Retain H0 | |
| |
|6. Standard Error of the mean tells you the difference that you….. expect or observe? |
|7. Standard error of the mean will always be… smaller or larger …than standard deviation. |
|8. As experimenters, we want standard error to be …. small or large? Explain why. |
| |
| |
-----------------------
μ = 500
σ = 100
x = 450
[pic]
z = -.5
,50000
.19146
.69146
69.146%
[pic]
[pic]
zcr = -1.96
zcr = -1.96
zobt = 1.5
zobt = -2
zcr = -1.96
zcr = -1.96
zobt = 1.5
zcr = -1.96
zcr = -1.96
zobt = 1.5
................
................
In order to avoid copyright disputes, this page is only a partial summary.
To fulfill the demand for quickly locating and searching documents.
It is intelligent file search solution for home and business.
Related searches
- university city education foundation
- city university high school memphis
- why this university essay sample
- university city schools mo
- university of minnesota education department
- university school district jobs
- university city high school mo
- university city public schools
- university city st louis
- university city mo school district
- university place school district jobs
- university city high school missouri