Question

The mean score on a 25-point placement test in mathematics used for the past two years at a large state university is 14.3. The placement coordinator wishes to test whether the mean score on a revised version of the test differs from 14.3. She gives the revised test to 20 entering freshmen early in the summer; the mean score is 14.6 with standard deviation 2.4.

a. Perform the test at the 10% level of significance using the critical value approach.

b. Perform the test at the 10% level of significance using the p-value approach.

Answer #1

A college entrance test company determined that a score of 25 on
the mathematics portion of the test suggests that a student is
ready for college-level mathematics. To achieve this goal, the
company recommends that students take a core curriculum of math
courses in high school. Suppose a random sample of 200 students who
completed this core set of courses results in a mean math score of
25.7 on the college entrance test with a standard deviation of 3.3.
Do...

A college entrance exam company determined that a score of 21 on
the mathematics portion of the exam suggests that a student is
ready for college-level mathematics. To achieve this goal, the
company recommends that students take a core curriculum of math
courses in high school. Suppose a random sample of 200 students who
completed this core set of courses results in a mean math score of
21.8 on the college entrance exam with a standard deviation of 3.5.
Do...

The mean SAT score in mathematics, μ , is 574 . The standard
deviation of these scores is 39 . A special preparation course
claims that its graduates will score higher, on average, than the
mean score 574 . A random sample of 14 students completed the
course, and their mean SAT score in mathematics was 602 . Assume
that the population is normally distributed. At the 0.01 level of
significance, can we conclude that the preparation course does what...

Let's assume that, over the years, a paper and pencil test of
anxiety yields a mean score of 35 for all incoming freshmen. We
wish to determine whether the score of a random sample of 20 new
freshmen, with a mean of 30 and a standard deviation of 10, can be
viewed as coming from this population. Test at the .05 level of
significance.

statistic question
Perform the following hypothesis test using the critical-value
approach.
A test of sobriety involves measuring the subject's motor
skills. The mean score for men who are sober is known to be 35.0. A
researcher would like to perform a hypothesis test to determine
whether the mean score for sober women differs from 35.0. Twenty
randomly selected sober women take the test and produce a mean
score of 41.0 with a standard deviation of 3.7. Perform the
hypothesis test...

A college entrance study company determined that a score of
20
on the mathematics portion of the study suggests that a student
is ready for college-level mathematics. To achieve this goal, the
company recommends that students take a core curriculum of math
courses in high school. Suppose a random sample of
150
students who completed this core set of courses results in a
mean math score of
20.3
on the college entrance study with a standard deviation of
3.4
Do...

Five years ago, the average math SAT score for students at one
school was 475. A teacher wants to perform a hypothesis test to
determine whether the mean math SAT score of students at the school
has improved. The mean math SAT score for a random sample of 40
students from this school is 469 with a standard deviation of 73.
Do the data provide sufficient evidence to conclude that the mean
math SAT score for students at the school...

1.The sample mean is an unbiased estimator for
the population mean. This means:
The sample mean always equals the population mean.
The average sample mean, over all possible samples, equals the
population mean.
The sample mean will only vary a little from the population
mean.
The sample mean has a normal distribution.
2.Which of the following statements is
CORRECTabout the sampling distribution of the
sample mean:
The standard error of the sample mean will decrease as the
sample size increases....

The Business Case for Agility
“The battle is not always to the strongest, nor the
race to the swiftest, but that’s the way to bet
’em!” —C. Morgan Cofer
In This Chapter
This chapter discusses the business case for Agility,
presenting six benefits for teams and the enterprise. It also
describes a financial model that shows why incremental development
works.
Takeaways
Agility is not just about the team. There are
product-management, project-management, and technical issues beyond
the team’s control. Lean-Agile provides...

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INNOVATION
Deep Change: How Operational Innovation Can Transform Your
Company
by
Michael Hammer
From the April 2004 Issue
Save
Share
8.95
In 1991, Progressive Insurance, an automobile insurer based in
Mayfield Village, Ohio, had approximately $1.3 billion in sales. By
2002, that figure had grown to $9.5 billion. What fashionable
strategies did Progressive employ to achieve sevenfold growth in
just over a decade? Was it positioned in a high-growth industry?
Hardly. Auto insurance is a mature, 100-year-old industry...

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