Question

an educator takes a random sample of theird graders in a large school district and divides them into two reading groups . the mean score on an exam of the 18 students in the new activities group was 51.72 with a standard deviation of 11.71. the mean score of the 20 students in the traditional group was 41.8 with a standerard deviation of 17.45. is this evideenc ethat the students in the new actibities group have a hugher reading score use a=0.01

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Answer #1

Question 12
A random sample of 64 second-graders in a certain school
district are given a standardized mathematics skills test. The
sample mean score is 51.12 . Assume the standard deviation for the
population of test scores is 15. The nationwide average score on
this test is 50. The school superintendent wants to know whether
the second-graders in her school district have greater math skills
than the nationwide average. Perform the hypothesis test and
compute the P-value.
Write down your...

1. A random sample of 64 second graders in a certain school
district are given a standardized mathematics skills test. The
sample mean score is 51.93. Assume the standard deviation for the
population of test scores is 15. The nationwide average score on
this test is 50. The school superintendent wants to know whether
the second graders in her school district have greater math skills
than the nationwide average. Perform the hypothesis test and
compute the P value. Based on...

A random sample of 64 second-graders in a certain school
district are given a standardized mathematics skills test.
The sample mean score is 51.21. Assume the
standard deviation for the population of test scores is 15. The
nationwide average score on this test is 50. The school
superintendent wants to know whether the second-graders in her
school district have greater math skills than the nationwide
average. Perform the hypothesis test and compute the p-value. Round
to four decimal places.

If a school district takes a random sample of 81 Math SAT scores
and finds that the average is 486, and knowing that the population
standard deviation of Math SAT scores is intended to be 100. Find a
99% confidence interval for the mean math SAT score for this
district.
? ≤ μ≤ ≤
If a school district takes a random sample of 81 Math SAT scores
and finds that the average is 486, and knowing that the population
standard...

The Trial Urban District Assessment (TUDA) is a government
sponsored study of student achievement in large urban school
districts. TUDA includes a reading test score from 0 to 500, with a
score of 254 considered a “basic” reading level and a score of 292
considered “proficient”. Reading test scores for a random sample of
80 eighth graders in the Dallas school district had a sample mean
of 259, with a sample standard deviation of 37.4.
a) Based on this sample...

Are you smarter than a second-grader? A random sample of 55
second-graders in a certain school district are given a
standardized mathematics skills test. The sample mean score is
x=55. Assume the standard deviation of test scores is σ=10. The
nationwide average score on this test is 51. The school
superintendent wants to know whether the second-graders in her
school district have greater math skills than the nationwide
average. Use the α=0.01 level of significance and the P-value
method with...

A school psychologist wants to test the effectiveness of a new
method of teaching French. She recruits 500 first -grade students
and randomly divides them into two groups. Group 1 is taught using
the new method, while Group 2 is taught via traditional methods.
The same teacher is assigned to teach both groups. At the end of
the year, an achievement test is administered and the results of
the two groups compared.
What is the response variable in this experiment?...

Group Statistics
Group
N
Mean
Std. Deviation
Std. Error Mean
DRP Score
1
21
51.48
11.007
2.402
2
23
41.52
17.149
3.576
An educator conducted an experiment to test whether new directed
reading activities in the classroom will help elementary school
pupils improve some aspects of their reading ability. She arranged
for a third grade class of 21 students to follow these activities
for an 8-week period. A control classroom of 23 third graders
followed the same curriculum without the...

Read the
scenarios 1 and 2 below and identify their type of study
as
Observational, Cohort, Prospective, Cross-sectional,
Retrospective, Case-Control, Randomized experiment, Randomized
block experiment or double-blind experiment.
Some
studies may have more than one
identifier.
Then,
explain why you selected that study type.
Scenario 2:
A school psychologist wants to test the
effectiveness of a new computer method for teaching reading to
first graders. She recruits 400 first grade students in her school
district and randomly divides them into...

A simple random sample of 23 third-grade children from a certain
school district is selected, and each is given a test to measure
his/her reading ability. You are interested in calculating a 90%
confidence interval for the population mean score. In the sample,
the mean score is 64 points and the standard deviation is 14
points. What is the margin of error associated with the confidence
interval?

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