Exam (elaborations)
Elementary Statistics (STATs 2023) module 4 Practice test
- Course
- Elementary Statistics
- Institution
- St. Petersburg College
Elementary Statistics (STATs 2023)
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Module 4 TestSelect the most appropriate response.
_____ 1. The purpose of statistical inference is to provide information about the:
a) sample based upon information obtained from the population
b) population based upon information obtained from a sample
Determine the point estimate.
_____ 2. A survey of 400 non-fatal accidents showed that 189 involved the use of a cell phone. Determine a
point estimate for p, the population proportion of non-fatal accidents that involved the use of a cell
phone.
a) 0.527
b) 0.896
c) 0.473
d) 0.321
Construct the requested confidence interval.
_____ 3. A media poll of 500 air travelers surveyed in national airports found that 370 favor tighter security
procedures in boarding planes. Construct a 90% confidence interval for the proportion of all air
travelers who are in favor of tighter security procedures.
( .74 ) (.26)
a) .74 ± 1.645
√ 500
( .5 ) (.5)
b) .74 ± 1.645
√ 500
( .74 ) (.26)
c) .74 ± 1.96
√ 500
( 370 )( 130)
d) 370 ±1.645
√ 500
Determine the margin of error.
_____ 4. It has been determined with 95% confidence that the proportion of on-line students at SPC who live
in Pinellas County is between 0.73 and 0.77.
Determine the margin of error associated with this confidence interval.
a) ±0.01
b) ±0.02
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, c) ±0.03
d) ±0.04
e) ±0.05
Determine the sample proportion.
____ 5. It has been determined with 95% confidence that the proportion of on-line students at SPC who live
in Pinellas County is between 0.73 and 0.77.
Determine the sample proportion of on-line SPC students who live in Pinellas County.
a) 0.10
b) 0.73
c) 0.75
d) 0.79
e) 0.90
Construct the requested confidence interval.
_____ 6. A survey of 280 homeless persons showed that 63 were veterans. Construct a 90% confidence interval
for the proportion of homeless persons who are veterans.
a) (0.161, 0.289)
b) (0.184, 0.266)
c) (0.176, 0.274)
d) (0.167, 0.283)
Determine the confidence level.
_____ 7. Determine the confidence level for confidence interval shown in the figure below.
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