answers to review ws (2 5)
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Answers to Review WS (2-5)P. 503 #10
Review for Ch 19 & 20 TEST
WS #2
• Assumptions are met.
* (1 )p pME z
n
.83(.17)1.645 .0618
100ME
WS #3
* (1 )p pME z
n
.35(.65).03 1.96
972n
n
Notes: Always round up when reporting n.In this problem we had some idea what p should be. Many times we do not. If we don’t know then use 0.5 for p.
WS #4
ˆ.71
(1 )
.2386
p pz
p pn
p
: .45
: .45o
a
H p
H p
Fail to reject the null since p-value is greater than alpha = .05. There is no evidence to suggest that the proportion of freshmen placed on academic probabation is less than 45%.
p is proportion of freshmen placed on academic probation.
Assumptions are all met – be sure to write formulas and plug in values to check.
Be sure to write formula!
WS #5
• Assumptions not met. Sample size is too small for np>10
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