Step-by-step explanation:
x'=53
σ=16
n=144
a) hypothesis
H0:µ=55
Ha:µ<55
This is a left tailed test
b) Test statistics
- z=(x'-u)/(sigma/sqrt {n})
=(53-55)/(16/sqrt{144})
=-1.5
c)Pvalue at z=|-1.5|
pvalue= p(z>1.5)
=1-0.933193
=0.066807
=0.0668
<u>Decision</u>
since pvalue>alpha(0.05) fail to reject the null hypotheis.
<u>Conclusion</u>
There is not sufficient evidence to support the claim the new computer program has not reduce the time to retrieve the data.
d)since Pvalue>alpha(0.025),so fail to reject the null hypothesis.
No, change in conclusion.
Answer:
1. 82.75
2.10.65
3. 93.4, 72.1
4. 104.05, 61.45
5. 114.7, 50.8
6. Yes
7. Because of the placement of these ranges on the graph
8. 35/91 = .38 %
By taking the amount of all of the students who scored a 90 or above and dividing it by the total amount of students.
Step-by-step explanation:
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