Algebra scores in a school district are normally distributed
with a mean of 74 and standard...
Algebra scores in a school district are normally distributed
with a mean of 74 and standard deviation 6. A new
teaching-and-learning system, intended to increase average scores,
is introduced to a random sample of 30 students, and in the first
year the average was 76.
(a) What is the probability that an average as high as 76 would
have been obtained under the old system?
(b) What is the null hypothesis for testing the new system, and
what is the...
Algebra scores in a school district are approximately normally
distributed with mean μ = 72 and...
Algebra scores in a school district are approximately normally
distributed with mean μ = 72 and standard deviation σ = 5. A new
teaching-and-learning system, designed to increase average scores,
is introduced to a random sample of 36 students, and in the first
year the average was 73.5.
(a) What is the probability that an average as high as 73.5
would have been obtained under the old system?
(b) Is the test significant at the 0.05 level? What about the...
Algebra scores in a school district are approximately normally
distributed with mean μ = 72 and...
Algebra scores in a school district are approximately normally
distributed with mean μ = 72 and standard deviation σ = 5. A new
teaching-and-learning system, designed to increase average scores,
is introduced to a random sample of 36 students, and in the first
year the average was 73.5.
(a) What is the probability that an average as high as 73.5
would have been obtained under the old system?
(b) Is the test significant at the 0.05 level? What about the...
Twenty-five students from Harry High School were accepted at
Magic University. Of those students, 10 were...
Twenty-five students from Harry High School were accepted at
Magic University. Of those students, 10 were offered athletic
scholarships and 15 were not. Mrs. Hermione believes Magic
University may be accepting people with lower ACT scores if they
are athletes. The newly accepted student ACT scores are shown
here.
Athletic scholarship: 16, 24, 20, 25, 24, 23, 21, 22, 20, 20
No athletic scholarship: 23, 25, 26, 30, 32, 26, 28, 29, 26, 27,
29, 27, 22, 24, 25
Part...