Question
In: Statistics and Probability
The number of students who belong to the dance company at each of several randomly selected...
The number of students who belong to the dance company at each of several randomly selected small universities is shown below. Round sample statistics and final answers to at least one decimal place.
28 22 21 22 35 35 40 30 40 27 40 32 30 30 29 26 29
Estimate the true population mean size of a university dance company with 98% confidence. Assume the variable is normally distributed.
Solutions
orchestra answered 2 years agoRelated Solutions
The number of syntax errors in a programming assignment for 20 randomly selected students are as...
The number of syntax errors in a programming assignment for 20
randomly selected students are as follows:
21, 5, 44, 44, 22, 49, 2, 48, 17, 27, 21, 34, 24, 12, 43, 12,
30, 10, 15, 15.
a. Construct an ordered stem-and-leaf display for this data.
b. Find the sample variance, S2 , and the sample standard
deviation, S, using the short-cut method.
c. Find the sample lower quartile Q1 , median Q2 and
Upper-Quartile Q3 .
d. Construct a...
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
The data below are scores of 8 randomly selected statistic students, and the number of hours...
The data below are scores of 8 randomly selected statistic
students, and the number of hours they studied for their quiz.
x (hours)
3
2
4
6
3
2
4
8
y (scores)
65
60
85
90
71
57
83
96
a. Calculate the linear correlation coefficient and coefficient
of determination and explain its meaning.
b. Find the equation of the regression line and use it to
predict the quiz score of a student who studied 5 hours.
c....
A survey of 36 randomly selected students who dropped a course was conducted at a college....
A survey of 36 randomly selected students who dropped a course
was conducted at a college. The following results were collected.
Complete parts (a) through (c).
a) Construct a contingency table for the two variables.
CourseCourse
PersonalPersonal
WorkWork
Male
FemaleFemale
(b) Test whether gender is independent of drop reason at
the
alphaαequals=0.1
level of significance.
What are the hypotheses?
A.
Upper H 0H0:
pSubscript Upper CCequals=pSubscript Upper PPequals=pSubscript
Upper WW
Upper H 1H1:
At least one of the proportions is...
The table below gives the number of hours ten randomly selected students spent studying and their...
The table below gives the number of hours ten randomly selected
students spent studying and their corresponding midterm exam
grades. Using this data, consider the equation of the regression
line, yˆ=b0+b1x, for predicting the midterm exam grade that a
student will earn based on the number of hours spent studying. Keep
in mind, the correlation coefficient may or may not be
statistically significant for the data given. Remember, in
practice, it would not be appropriate to use the regression line...
The table below gives the number of hours seven randomly selected students spent studying and their...
The table below gives the number of hours seven randomly
selected students spent studying and their corresponding midterm
exam grades. Using this data, consider the equation of the
regression line, yˆ=b0+b1x, for predicting the midterm exam grade
that a student will earn based on the number of hours spent
studying. Keep in mind, the correlation coefficient may or may not
be statistically significant for the data given. Remember, in
practice, it would not be appropriate to use the regression line...
27 randomly selected students were asked the number of movies they watched the previous week. The...
27 randomly selected students were asked the number of movies
they watched the previous week. The results are as follows: # of
Movies 0 1 2 3 4 5 6 Frequency 5 2 2 3 7 3 5 Round all your answers
to 4 decimal places where possible. The mean is: The median is: The
sample standard deviation is: The first quartile is: The third
quartile is: What percent of the respondents watched at least 6
movies the previous week?...
Fifteen randomly selected college students were asked to state the number of hours they slept the...
Fifteen randomly selected college students were asked to state
the number of hours they slept the previous night. The resulting
data are 5, 10, 7, 8, 6, 7, 7, 6, 6, 9, 4, 3, 8, 9, 7. Find the
following. (Round your answers to two decimal places.)
(a) Variance s2, using formula below $ s^2 = \dfrac{\sum{(x -
\overline{x})^2}}{n - 1}$ s2 =
(b) Variance s2, using formula $ s^2 = \dfrac{\sum{x^2} -
\dfrac{(\sum{x})^2}{n}}{n - 1} $ s2 =
(c)...
The table below gives the number of hours five randomly selected students spent studying and their...
The table below gives the number of hours five randomly selected
students spent studying and their corresponding midterm exam
grades. Using this data, consider the equation of the regression
line, yˆ=b0+b1x, for predicting the midterm exam grade that a
student will earn based on the number of hours spent studying. Keep
in mind, the correlation coefficient may or may not be
statistically significant for the data given. Remember, in
practice, it would not be appropriate to use the regression line...
The table below gives the number of hours five randomly selected students spent studying and their...
The table below gives the number of hours five randomly selected
students spent studying and their corresponding midterm exam
grades. Using this data, consider the equation of the regression
line, yˆ=b0+b1x, for predicting the midterm exam grade that a
student will earn based on the number of hours spent studying. Keep
in mind, the correlation coefficient may or may not be
statistically significant for the data given. Remember, in
practice, it would not be appropriate to use the regression line...
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