Question 879203: 1.
Convert x = 70 to z-score if Normal Distribution has mean = 50 and Standard Deviation = 10.
A)
0.5
B)
1.0
C)
1.5
D)
2.0
Question 2
1.
Find x-value for z-score=1.5 if Normal Distribution has mean = 50 and Standard Deviation = 10.
A)
65
B)
60
C)
55
D)
45
Question 3
1.
Using the Appendix table for standard normal distribution
find the area under the curve to the left of z = -1.25
A)
0.1432
B)
0.3461
C)
0.4574
D)
0.1056
Question 4
1.
Use Appendix Table for standard normal distribution
to find area under the curve to the right of z = 2.00
A)
0.4572
B)
0.0228
C)
0.1462
D)
0.5431
Question 5
1.
Use standard normal distribution table (Appendix Table II) to find
the probability that z is between -1.5 and 1.5: P(-1.5 < z < 1.5)
A)
0.9332
B)
0.4268
C)
0.8664
D)
0.0559
Question 6
1.
For Normal distribution with mean 50 and standard deviation 10
find probability that x will be less than 35: P(x < 35).
A)
0.8893
B)
0.2101
C)
0.1020
D)
0.0668
Question 7
1.
Household Income has Normal Distribution with average 44,000
and Standard Deviation = 20,000. Find the probability that
Household Income is GREATER than 56,000.
A)
0.1245
B)
0.2743
C)
0.4184
D)
0.6105
Question 8
1.
Number of students who graduate College every year is Normal Distribution
with mean = 400 and standard deviation 50. Find probability that this year
between 300 and 500 students will graduate College.
Tip: Convert 300 and 500 to z values, use Appendix Table II
and then apply rule: P(a < x < b) = P(x < b) - P(x < a)
A)
0.52
B)
0.65
C)
0.95
D)
0.81
Question 9
1.
Sample size is 64, sample mean is 50.
Assuming the population standard deviation is ?=16,
construct 95% confidence interval for population mean.
For z factor use z?/2 = 2
A)
from 46 to 54
B)
from 40 to 60
C)
from 50 to 64
D)
from 35 to 65
1 points
Question 10
1.
For sample mean x = 80, sample size n = 36 and sample standard deviation s = 24
find 90% confidence interval for population mean.
This is the case when population standard deviation is not known.
Use formula on page 328 with t-value.
Find t-value in Appendix Table IV.
Tip: For confidence level 90% ? = 1 - 0.90 = 0.10, ?/2 = 0.10/2 = 0.05
So, in Table IV use column t0.05 and line with df = n - 1 = 36 - 1 = 35.
A)
from 65.48 to 95.86
B)
from 75.44 to 82.16
C)
from 73.24 to 86.76
D)
from 70.18 to 88.65
Answer by ewatrrr(24785)   (Show Source):
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