A teacher gives a test with 17 questions. Students are allowed
to choose any thirteen to...
A teacher gives a test with 17 questions. Students are allowed
to choose any thirteen to answer. How many different choices of
thirteen questions are there?
An instructor gives an exam with fifteen questions. Students are
allowed to choose any eleven to answer.
(a)
How many different choices of eleven questions are there?
(b)
Suppose six questions require proof and nine do not.
(i)
How many groups of eleven questions contain four that require
proof and seven that do not?
(ii)
How many groups of eleven questions contain at least one that
requires proof?
(iii)
How many groups of eleven questions contain at most three that...
An instructor gives an exam with seventeen questions. Students
are allowed to choose any twelve to answer.
(a)
How many different choices of twelve questions are there?
(b)
Suppose seven questions require proof and ten do not.
(i)
How many groups of twelve questions contain five that require
proof and seven that do not?
(ii)
How many groups of twelve questions contain at least one that
requires proof?
(iii)
How many groups of twelve questions contain at most three that...
A teacher gives a third grade class of n = 16 a vocabulary test
at the beginning of the school year. To evaluate the changes that
occur during the year, students are tested again at the end of the
year. Their test scores revealed an average improvement of MD = 5.7
points with s2 = 144. Does this constitute a significant
improvement? Use a one tail, related-samples t test with an alpha
level of .05.
a. Calculate Cohen's D (Round...
A teacher gives a third grade class of n = 16 a vocabulary test
at the beginning of the school year. To evaluate the changes that
occur during the year, students are tested again at the end of the
year. Their test scores revealed an average improvement of MD = 5.7
points with s2 = 144. Does this constitute a significant
improvement? Use a one tail, related-samples t test with an alpha
level of .05.
find standard error find degrees...
A math department gives all college algebra students a test to
test rather or not students taking college algebra on site perform
better on Final than students that take class completely online.
The Math department gathers random samples of 40 on-site students
(Students who take class in the classroom) and 35 online students.
The test score for each student in the random sample is determined.
The mean score for the on-site students is 75, with a standard
deviation of 12....
Mr. Grade’s was a new teacher whose students loved to chew gum,
but it wasn’t allowed at school. To motivate his students, Mr.
Grade created a classroom procedure that stated that students could
chew gum during independent work. His students behaved well during
independent work time, and their rate of work completion increased.
One day, Mr. Grade was observed by the principal. After the
observation, the principal asked Mr. Grade to see her during his
planning period. From the following...
A statistics teacher wants to see if there is any difference in
the abilities of students enrolled in statistics today and those
enrolled five years ago. A sample of final examination scores from
students enrolled today and from students enrolled five years ago
was taken. You are given the following information. Today
(Population 1) Five Years Ago (Population 2) Sample Mean 84 89
Sample Variance 112.5 54 Sample Size 45 36 The 92.50% confidence
interval for the difference between the...
A statistics teacher wants to see if there is any difference in
the abilities of students enrolled in statistics today and those
enrolled five years ago. A sample of final examination scores from
students enrolled today and from students enrolled five years ago
was taken. You are given the following information. Today Five
Years Ago x̄ 82 88 σ2 112.5 54 n 45 36
The 95% confidence interval for the difference between the two
population means is
a. -3.08 to...
A statistics teacher wants to see if there is any difference in
the abilities of students enrolled in statistics today and those
enrolled five years ago. A sample of final examination scores from
students enrolled today and from students enrolled five years ago
was taken. You are given the following information.
today (population 1) Five years ago (population 2)
sample mean 86 88
sample variance 112.5 54
sample size 45 36
The 92.50% confidence interval for the difference between the...
A teacher gives the following assignment to 200 students: Check
the local newspaper every morning for a week and count how many
times the word “gun” is mentioned on the “local news” pages. At the
end of the week, the students report their totals. The mean result
is 85, with a standard deviation of 8. The distribution of scores
is normal. a. How many students would be expected to count fewer
than 70 cases? b. How many students would be...