Answer:
The z-score for Michael's exam grade is 0.50
Step-by-step explanation:
Data
- standard deviation, σ = 2.0
- Michael's exam grade is the value of interest, x = 86
From definition, z-score is computed as follows:
Z = (x - μ)/σ
Z = (86 - 85)/2.0
Z = 0.50
7.00 * 5%= 0.35
7.00+0.35= 7.35
20.00-7.35=($12.65) hope I helped
Answer:
We failed to accept null hypothesis
Step-by-step explanation:
x= 5.74
Standard deviation = 

n = 65
We will use z test
Formula : 
Substitute the values :


Refer the z table for p value
p value = 0.0314
α = 0.10
p value < α
So, we failed to accept null hypothesis
Answer:
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Step-by-step explanation: