Question
In: Statistics and Probability
A researcher asks if there is a relationship between the number of errors on a math...
A researcher asks if there is a relationship between the
number of errors on a math test (X) and the person's level of
satisfaction with the performance (Y). The data collected from
seven participants is as follow:
Participant 1 2 3 4 5 6 7
Variable X 9 8 4 6 7 10 5
Variable Y 3 2 8 5 4 2 7
a. Compute the mean and standard deviation for each
variable.
b. Create a scaterplot to have a graphical representation of
the correlation.
c. Compute the correlation coefficient.
d. Report the results and what do you conclude about the
relationship?
Solutions
orchestra answered 1 year agoRelated Solutions
A sports researcher is interested in determining if there is a relationship between the number of...
A sports researcher is interested in determining if there is a
relationship between the number of home wins depends on the sport.
A random sample of 200 games is selected and the results are given
below.
Football Basketball Soccer Baseball
Home team wins 30 20 15 35
Visiting team wins 20 30 35 15
What is the test statistic value for the above data?
A 4
B 10
C 20
D None of the above
A sports researcher is interested in determining if there is a relationship between the number of...
A sports researcher is interested in determining if there is a
relationship between the number of home team and visiting team wins
and different sports. A random sample of 633 games is selected and
the results are given below. Conduct test of hypothesis to test the
claim that the number of home team and visiting team wins is
independent of the sport. Use a=0.05.
Football
BasketBall
Soccer
Baseball
Hometeam Wins
89
165
91
49
Visiting Team Wins
60
89
52...
A researcher suspects that there is a direct relationship between hand-eye coordination and academic success in math.
7) A researcher suspects that there is a direct relationship between hand-eye coordination and academic success in math. A sample of n = 16 students who have demonstrated above average performance on a second-grade math test is selected. These students are given a standardized hand-eye coordination task where the average score for this group is μ = 55. The 16 students in the sample produced a mean of 61 with SS of 540.
a) Are the data sufficient...
A researcher is interested in determining whether there is a relationship between the weekly number of...
A researcher is interested in determining whether there is a
relationship between the weekly number of room air-conditioning
units sold and the time of year. What type of descriptive chart
would be most useful in performing this analysis? Explain your
choice.
A researcher investigates whether there is a relationship between the number of cigarettes a person smokes...
A researcher investigates whether there is a relationship
between the number of cigarettes a person smokes and whether the
person wears a seat belt when driving. His thinking is that people
who smoke more are less concerned about their health and safety and
therefore may be less inclined to wear seat belts. He collects the
following data:
Number of Cigarettes Smoked per Day
0 1-14 15-34 35
and over
----------------------------------------------------------------------------
Wear
seat
belts 175 20 42 41
Don’t
wear seat
belts 150 17 53 64
At a 0.01 significance level test...
A researcher investigates whether there is a relationship between the number of cigarettes a person smokes...
A researcher investigates whether there is a relationship
between the number of cigarettes a person smokes and whether the
person wears a seat belt when driving. His thinking is that people
who smoke more are less concerned about their health and safety and
therefore may be less inclined to wear seat belts. He collects the
following data:
Number of Cigarettes Smoked per Day
0 1-14 15-34 35
and over
----------------------------------------------------------------------------
Wear
seat
belts 175 20 42 41
Don’t
wear seat
belts 150 17 53 64
At a 0.01 significance level test...
A researcher investigates whether there is a relationship between the number of cigarettes a person smokes...
A researcher investigates whether there is a relationship
between the number of cigarettes a person smokes and whether the
person wears a seat belt when driving. His thinking is that people
who smoke more are less concerned about their health and safety and
therefore may be less inclined to wear seat belts. He collects the
following data:
Number of Cigarettes Smoked per Day
0 1-14 15-34 35
and over
----------------------------------------------------------------------------
Wear
seat
belts 175 20 42 41
Don’t
wear seat
belts 150 17 53 64
At a 0.01 significance level test...
For a sample of 10 individuals, a researcher calculates residuals for the relationship between “number of...
For a sample of 10 individuals, a
researcher calculates residuals for the relationship between
“number of delinquent friends” and “number of prior arrests” and
finds that the positive residuals = 125. The researcher then
collects a second sample of 10 individuals and calculates the
residuals on the same two variables and discovers the sum of the
positive residuals = 75. What can you conclude about the strength
of the relationship between “number of delinquent peers” and
“number of prior arrests”...
For a sample of 10 individuals, a researcher calculates residuals for the relationship between “number of...
For
a sample of 10 individuals, a researcher calculates residuals for
the relationship between “number of delinquent friends” and “number
of prior arrests” and finds that the positive residuals = 125. The
researcher then collects a second sample of 10 individuals and
calculates the residuals on the same two variables and discovers
the sum of the positive residuals = 75. What can you conclude about
the strength of the relationship between “number of delinquent
peers” and “number of prior arrests”...
A researcher measures the relationship between the number of interruptions during a class and time spent...
A researcher measures the relationship between the number of
interruptions during a class and time spent "on task" (in minutes).
Answer the following questions based on the results provided.
Number
of
Interruptions
Time Spent
"On Task"
8
15
4
38
7
18
2
32
Part (a)
Compute the Pearson correlation coefficient. (Round your answer
to three decimal places.)
Part (b)
Multiply each measurement of interruptions times 3 and
recalculate the correlation coefficient. (Round your answer to
three decimal places.)
Part...
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