Question 1
10 / 10 pts
You may find the following files helpful throughout the exam:
Statistics_Equation_Sheet
(Links to an external site.)
standard normal table
(Links to an external site.)
t-table
(Links to an
...
Question 1
10 / 10 pts
You may find the following files helpful throughout the exam:
Statistics_Equation_Sheet
(Links to an external site.)
standard normal table
(Links to an external site.)
t-table
(Links to an external site.)
Suppose we have independent random samples of size n1 = 520
and n2 = 450. The proportions of success in the two samples are
p1= .65 and p2 = .52. Find the 95% confidence interval for the
difference in the two population proportions.
Answer the following questions:
1. Multiple choice: Which equation would you use to solve this
problem?
A.
B.
MATH 110 EXAM 8 PORTAGE LEARNING STATISTICS
C.
D.
2. List the values you would insert into that equation.
3. State the final answer to the problem
Your Answer:
I would choose B
P1 = .65 P 2= .52 n1 =520 n2 = 450
.65-.52 +/- 1.96
.65
(
1
−
.65
)
+
.52
(
1
−
.52
)
520
450
.13 +/- 1.96 (0.0315)
Intervals are .06826, .19174)
From table 6.1, we see that 95% confidence corresponds to
z=1.96. Notice that the sample sizes are each greater than 30,
so we may use eqn. 8.2:
B.
So, the interval is (.06828,.19172).
Question 2
10 / 10 pts
You may find the following files helpful throughout the exam:
Statistics_Equation_Sheet
(Links to an external site.)
standard normal table
(Links to an external site.)
t-table
(Links to an external site.)
In certain hospital, nurses are required to constantly make rounds
to check in on all of the patients. The nursing supervisor would
like to know if there is a difference between the number of rounds
completed per shift by the nurses on the day shift compared to
the nurses on the night shift. So, the nursing supervisor checks
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