Question

Results from a civil servant exam are shown in the table to the right. Is there sufficient evidence to support the claim that the results from the test are discriminatory? Use a 0.01 significance level. |
Passed |
Failed |
|||
---|---|---|---|---|---|

White candidates |
2020 |
1313 |
|||

Minority candidates |
77 |
2626 |

Determine the null and alternative hypotheses.

Determine the test statistic. chi squaredχ2=

P Value=

Answer #1

p-value is less than 0.01

Therefore reject Ho at 0.01 l.o.s.

A study was done on prot and non-pro tests. The results are
shown in the table. Assume that the two samples are independent
simple random samples selected from normally distributed
populations, and do not assume that the population standard
deviations are equal. Complete parts (a) and (b) below. Use a
significance level 0.01 for both parts.
___________________________________________________________________
Pro Non-pro
μ μ1 μ2
n 34 32
x 74.86 83.25
s 10.51 18.27
_______________________________________________...

The table below includes results from polygraph (lie detector)
experiments conducted by researchers. In each case, it was known
if the subjected lied or did not lie, so the table indicates when
the polygraph test was correct. Use a 0.05 significance level to
test the claim that whether a subject lies is independent of the
polygraph test indication. Do the results suggest that polygraphs
are effective in distinguishing between truth and lies?
_ Did_Not_Lie Lied
Polygraph_indicated_lie 7 44
Polygraph_indicated_no_lie 29 ...

The table below includes results from polygraph (lie detector)
experiments conducted by researchers. In each case, it was known
if the subjected lied or did not lie, so the table indicates when
the polygraph test was correct. Use a 0.05 significance level to
test the claim that whether a subject lies is independent of the
polygraph test indication. Do the results suggest that polygraphs
are effective in distinguishing between truth and lies? Determine
the null and alternative hypotheses. A. Ho:...

The following contingency table shows the distribution of grades
earned by students taking a midterm exam in an MBA class,
categorized by the number of hours the students spent studying for
the exam. Complete parts a. and b. below.
TIME SPENT STUDYING
A
B
C
LESS THAN 3 HOURS
4
19
8
3-5 HOURS
18
17
5
MORE THAN 5 HOURS
16
13
4
a. Using APLHA = 0.01 perform a chi-square test to determine if
a student's grade on...

Consider a drug testing company that provides a test for
marijuana usage. Among 291tested subjects, results from 27subjects
were wrong (either a false positive or a false negative). Use a
0.05 significance level to test the claim that less than 10 percent
of the test results are wrong.
Identify the null and alternative hypotheses for this test.
Choose the correct answer below.
A.
Upper H 0
:
pless than
0.1
Upper H 1
:
pequals
0.1
B.
Upper H 0...

Randomly selected birth records were obtained, and categorized
as listed in the table to the right. Use a 0.01 significance level
to test the reasonable claim that births occur with equal frequency
on the different days of the week. How might the apparent lower
frequencies on Saturday and Sunday be explained?
Day
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Number of Births
50
58
65
64
59
56
35
Determine the null and alternative
hypotheses:
Calculate the test statistic X2...

Assume that a simple random sample has been selected from a
normally distributed population and test the given claim. Identify
the null and alternative? hypotheses, test? statistic, critical?
value(s), and state the final conclusion that addresses the
original claim.
A simple random sample of pages from a dictionary is obtained.
Listed below are the numbers of words defined on those pages. Given
that this dictionary has 1459 pages with defined? words, the claim
that there are more than? 70,000 defined...

Goalkeeper Jump
Left
Center
Right
Kick to Left
53
44
38
Kick to Center
36
13
34
Kick to Right
48
99
56
In soccer, serious fouls result in a penalty kick with one
kicker and one defending goalkeeper. The accompanying table
summarizes results from
291291
kicks during games among top teams. In the table, jump
direction indicates which way the goalkeeper jumped, where the
kick direction is from the perspective of the goalkeeper. Use a
0.05 significance level to...

The data in the table to the right resulted from an experiment
that utilized a completely randomized design. Complete parts a and
b below.
Treatment 1
Treatment 2
Treatment 3
3.7
5.2
1.81
1.2
2.8
0.30
4.3
4.2
2.1
5.9
3.8
1.8
a.
Use statistical software or the appropriate calculation formulas
to complete the ANOVA table below.
Source
df
SS
MS
F statistic
Treatments
Error
Total
(Round to three decimal places as needed.)
b.
Test the null hypothesis...

A statistics instructor is interested in determining whether or
not a review session improved student performance on the final
exam. The review session was administered to a sample of students
(n=32) in an attempt to determine if this has a positive effect on
exam performance. Based on information gathered in previous
semesters, the population mean for the final exam is 75.2. The
sample mean obtained from the 32 students is 80 with a sample
standard deviation of 12.
Use a...

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