Z-scores!
Find the z-score of 3.05
.9989
Find the t-score when you have a confidence level of 99% and a df of 30
2.75
If you do a 90% confidence test how confidence how confident can you be in your answers?
90%
Find H(o) and H(a):
The average class size is 20 students.
average class size=18.3
H(o)=20
H(a)<20
Find the z-score when given the value -1.03
.1515
Find the t-score when you have a confidence level of 98% and a df of 1000
2.33
If you do a 80% confidence test how confidence how confident can you be in your answers?
80%
Find H(o) and H(a):
The average shoe size is 8 students.
average shoe size=7.5
H(o)=8
H(a)<8
when you have the number 0.325 do you choose the category above(0.33) or the category below(0.32)?
Category above
Find the t-score when you have a confidence level of 99.8% and a df of 19
3.579
If you do a 99% confidence test how confidence how confident can you be in your answers?
99%
Do all 4 steps:
Test the claim the average candy bar has 215 calories.
Average= 170
Standard Deviation= 67
n=30
t=3.68
p=0.0005
Reject H(o)
If your given...
Average=22.4
Ho=24
Sx=2.45
n=40
Can you find the z-score?
Yes, you plug it in the z-score formula.
Find the T-score if you have:
Average:5
M:4
Standard Deviation:2
N:30
2.74
Find the 90% confidence interval when given the following:
Average:50
Standard Deviation: 5
N: 30
154.9
99.1
Do all 4 steps:
Test the claim the average classroom has 20 students.
Average= 18.3
Standard Deviation= 5
n=30
T=1.86
P=0.03
Reject H(o)
When given
Average=3.55
Ho=4
Sx=0.87
Find the z-score?
Trick question!!!
You need the Standard Deviation(Sx) to find z-score
Find the T-score if you have:
Average:6
M:7
Standard Deviation:1.5
N:30
3.65
Find the 99% confidence interval when given the following:
Average:200
Standard Deviation: 50
N: 45
180.8
219.2
Do all 4 steps:
Test the claim the average book has 150 pages.
Average= 250
Standard Deviation=50
n=30
T=10.95
P=1
Accept H(o)