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Test 11B
AP Statistics
Name:
Directions:
Work on these sheets.
Tables and formulas appear on a separate sheet.
Part 1:
Multiple Choice.
Circle the letter corresponding to the best answer.
1.
You want to compute a 90% confidence interval for the mean of a population with unknown
population standard deviation.
The sample size is 30.
The value of
t*
you would use for this interval
is
(a)
1.96
(b)
1.645
(c)
1.699
(d) .90
(e)
1.311
(f)
None of the above
2.
A 95% confidence interval for the mean reading achievement score for a population of thirdgrade
students is (44.2, 54.2).
The margin of error of this interval is
(a)
95%
(b)
5
(c)
2.5
(d) 10
(e) The answer cannot be determined from the information given.
3.
The effect of acid rain upon the yield of crops is of concern in many places. In order to determine
baseline yields, a sample of 13 fields was selected, and the yield of barley (g/400m
2
) was
determined. The output from SAS appears below:
QUANTILES(DEF=4)
EXTREMES
N
13
SUM WGTS
13
100% MAX
392
99%
392
LOW
HIGH
MEAN
220.231
SUM
2863
75% Q3
234
95%
392
161
225
STD DEV 58.5721
VAR
3430.69
50% MED
221
90%
330
168
232
SKEW
2.21591
KURT
6.61979
25% Q1
174
10%
163
169
236
USS
671689
CSS
41168.3
0% MIN
161
5%
161
179
239
CV
26.5958
STD MEAN 16.245
1%
161
205
392
A 95% confidence interval for the mean yield is:
(a) 220.2 ± 1.96(58.6)
(b) 220.2 ± 1.96(16.2)
(c) 220.2 ± 2.18(58.6)
(d) 220.2 ± 2.18(16.2)
(e) 220.2 ± 2.16(16.2)
4.
To use the twosample
t
procedure to perform a significance test on the difference between two
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This note was uploaded on 05/01/2011 for the course AP CLASSES 101 taught by Professor Mr.smith during the Spring '11 term at Korea Advanced Institute of Science and Technology.
 Spring '11
 MR.Smith

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