Question
In: Statistics and Probability
In a class students were asked to report their gender and whether they had ever been...
In a class students were asked to report their gender and whether they had ever been in a car accident. Results are shown in the following table:
| Ever had a car accident? | ||
|---|---|---|
| Gender | Yes | No |
| Male | 10 | 10 |
| Female | 5 | 24 |
We want to test if car accident and gender are related or not.
What is the expected frequency of male and car accident? [Answer to 2 decimal places.]
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What is the expected frequency of male and no car accident? [Answer to 2 decimal places.]
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What is the expected frequency of female and car accident? [Answer to 2 decimal places.]
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What is the expected frequency of female and no car accident? [Answer to 2 decimal places.]
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To test independence between gender and car accidents, what is the value of chi-square test statistic? [Answer to 3 decimal places.]
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Suppose we are testing:
Null hypothesis: gender and car accidents are
not related,
against
Alternative hypothesis: gender and car accidents
are related.
If the p-value associated to the ch-square test-statistics is
0.014 and the level of significance is 5%, what will be your
conclusion?
Not enough information to reach a decision
Do not reject null hypothesis
Reject null hypothesis
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Solutions
orchestra answered 1 year agoRelated Solutions
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In an activity in a statistics class, students were asked if
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They following table summarizes results, as counts, classi?ed by
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(SHOW YOUR WORK)
Ever
Pulled
Over
by Police?
Sex
No
Yes
Total
Male
7
16
Female
20
21
Total
Ever
Pulled
Over
by Police?
Sex
No
Yes
Total
Male
Female
Total
(b) (3 points) Multiply all counts in the table by 10. (The blank
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In a poll, respondents were asked whether they had ever been in a car accident.
Find the indicated probability. In a poll, respondents were asked whether they had ever been in a car accident. 473 respondents indicated that they had been in a car accident and 243 respondents said that they had not been in a car accident. If one of these respondents is randomly selected, what is the probability of getting someone who has been in a car accident?
Randomly selected students in a statistics class were asked to report the number of hours they...
Randomly selected students in a statistics class were asked to
report the number of hours they slept on weeknights and on
weekends. At α = 0.05. Can it be claimed that the scores on 2 tests
are correlated on 0.01 significance level?
Student #: 1 2 3 4 5 6 7 8
Test 1: 67 88 76 88 91 95 79 71
Test 2: 69 78 76 84 86 96 70 68
Students in a different statistics class were asked to report the age of their mothers when...
Students in a different statistics class were asked to report
the age of their mothers when they were born. Here are the summary
statistics:
Sample size: 28 sample mean: 29.643
years sample stDev:
4.564 years
Calculate the standard error of this sample mean.
Determine and interpret a 90% confidence interval for the
mother’s mean age (at student’s birth) in the population of all
students at the college.
How would a 99% confidence interval compare to the 90%
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Sixty-four students in an introductory college economics class were asked how many credits they had earned...
Sixty-four students in an introductory college economics class
were asked how many credits they had earned in college, and how
certain they were about their choice of major. At α = .01,
is the degree of certainty independent of credits earned?
Credits Earned
Very
Uncertain
Somewhat
Certain
Very
Certain
Row Total
0 – 9
11
6
5
22
10 – 59
10
5
6
21
60 or more
1
8
12
21
Col Total
22
19
23
64
(a) At...
Sixty-four students in an introductory college economics class were asked how many credits they had earned...
Sixty-four students in an introductory college economics class
were asked how many credits they had earned in college, and how
certain they were about their choice of major. At α = .02,
is the degree of certainty independent of credits earned?
Credits Earned
Very
Uncertain
Somewhat
Certain
Very
Certain
Row Total
0 – 9
15
9
3
27
10 – 59
7
5
9
21
60 or more
1
8
14
23
Col Total
23
22
26
71
(a) At...
In March 2012, students in class were surveyed for favorite juice flavor. They were asked to...
In March 2012, students in class were surveyed for favorite
juice flavor. They were asked to try all four and chose the one
they liked the best. Is one type of juice flavor preferred
more?
# Best Flavor Votes
grape
15
orange
6
apple
15
lemonade
25
decide what would be the appropriate statistical test from the
list below
1 variable: Chi Square Goodness of Fit Test
write out the main question and then the null and...
A poll of 1500 college students asked whether or not they had used the Internet to...
A poll of 1500 college students asked whether or not they had
used the Internet to find a place to live sometime within the past
year. There were 525 students who answered “Yes”; the other 975
answered “No”.
a)What is n? What is the value of X? Find the sample proportion pˆ
.
d)Can we use normal approximation for this sample?
e)What normal model are you using X or Pˆ ? Please find the mean
and standard deviation appropriately.
f)...
1. Students were asked whether they thought trust and honesty were essential in business and the...
1.
Students were asked whether they thought trust and honesty were
essential in business and the workplace. Here the counts classified
by gender:
Male
Female
Agree
11,724
14,169
Disagree
1,163
746
a.
What percentage of females agreed?
b. What
percentage of males agreed?
c.
What is the explanatory variable?
d. Fill
in the table of expected counts.
Male
Female
Agree
Disagree
e.
Fill in the table showing the calculation for each
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Male
Female
Agree
Disagree
f. Find the total...
A statistics professor asked her students whether or not they were registered to vote. In a...
A statistics professor asked her students whether or not they
were registered to vote. In a sample of 50 of her students
(randomly sampled from her 700 students), 35 said they were
registered to vote.
Questions 1 - 6 pertain to scenario 1.
Question 1 (1 point)
Which of the following properly explains the 95% confidence
interval for the true proportion of the professor's students who
were registered to vote?
Question 1 options:
a)
We are 95 % confident that...
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