Exam (elaborations)
STA 2023 Elementary Statistics STA 2023 Final Exam Review Questions and Answers
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- Saint Petersburg College
STA 2023 Elementary Statistics
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Nicholas Pell (username: npell1)Attempt 1
Written: Nov 14, 2019 7:38 AM - Dec 3, 2019 2:51 PM
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State your conclusion to the following hypothesis test.
A certain academic program boasts that 87% of their graduates find full-time
employment in their field within the first year of graduation. The academic director
is concerned that market factors may have adversely affected the full-time
placement rate and decides to perform a Hypothesis Test to see if her concern is
warranted.
The hypothesis test is performed at a 5% significance level and the resulting p-
value is 0.07.
Assume that all conditions for testing have been met and choose the statement that
contains the correct conclusion.
Question options:
not sufficient sample evidence to conclude that the full-time placement rate is now less than 8
s greater than 0.05.
sufficient sample evidence to conclude that the full-time placement rate is now less than 87%
greater than 0.05.
sufficient sample evidence to conclude that the full-time placement rate is 87% because the p-
5.
not sufficient sample evidence to conclude that the full-time placement rate is 87% because th
han 0.05.
Use the model to make the appropriate prediction.
A sociologist wanted to determine whether there was a relation between a state's
poverty rate (x) and its teen pregnancy rate (y). Data from all 50 states produced
the regression model:
yˆ=4.3+1.4(x
What does the model suggest for the poverty rate of Florida, which has a poverty
rate of 16.6?
Question options:
, Select the most appropriate response.
As sample size increases (other things being equal), what tends to happen to 95%
confidence intervals?
Question options:
ome narrower.
not change.
ome wider.
Select the most appropriate response.
A p-value=0.35 indicates that:
Question options:
strong sample evidence against the null hypothesis.
hypothesis is true.
hypothesis is false.
weak to no sample evidence against the null hypothesis.
Select the most appropriate response.
What would happen (other things being equal) to a confidence interval if you
calculated a 99% confidence interval rather than a 95% confidence interval?
Question options:
t change.
,wider.
narrower.
State the null and alternative hypotheses you would use to test the following
situation.
The American Automobile Association (AAA) claims that 54% of fatal car/truck
accidents are caused by driver error. A researcher believes the percentage has
decreased during the past year and tests the claim at the 10% level of significance.
Question options:
.54
.54
.54
.54
.54
.54
.54
.54
Determine the expected count under the null hypothesis.
Is achieving a basic skill level in a subject independent to the location of the
school? A random sample of students categorized by the location of school and the
number achieving basic skills in three subjects is shown in the table.
Subject
Location of Reading Math Science Totals
School
Urban 43 42 38 123
Suburban 63 66 65 194
Totals 106 108 103 317
Under the null hypothesis for a Chi-square test of independence, what would be the
expected number of students achieving basic math skills in the urban schools?
Question options:
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