Question

1. Null (Ho) and Alternative (Ha) Hypotheses

a. The time needed for college students to complete a certain paper and pencil maze follows a normal distribution with a mean of 30 seconds and a standard deviation of 3 seconds. You wish to see if the mean time ? is changed by vigorous exercise, so you have a group of nine college students exercise vigorously for 20 minutes and then complete the maze.

Answer #1

The time needed for college students to complete a certain
paper-and-pencil maze follows a normal distribution with a mean of
30 seconds and a standard deviation of 3.1 seconds. You wish to see
if the mean time ? is changed by vigorous exercise, so you have a
group of 25 college students exercise vigorously for 30 minutes and
then complete the maze. It takes them an average of ?¯=28.1seconds
to complete the maze. Use this information to test the
hypotheses...

Does vigorous exercise affect concentration? In general, the
time needed for people to complete a certain paper-and-pencil maze
follows a normal distribution, with a mean of 30 seconds and a
standard deviation of three seconds. You wish to see if the mean
time μ is changed by vigorous exercise, so you have a random sample
of nine employees of your company (that you assume are
representative of people in general) exercise vigorously for 30
minutes and then complete the maze....

The time needed for college students to complete a certain
paper-and-pencil maze follows a normal distribution with a mean of
30 seconds and a standard deviation of 3 seconds. You wish to see
if the mean time μ μ is changed by vigorous exercise, so you have a
group of 15 college students exercise vigorously for 30 minutes and
then complete the maze. It takes them an average of x¯=27.2 x ¯ =
27.2 seconds to complete the maze. Use...

The time needed for students complete a certain paper and pencil
maze follows an approximately Normal distribution and has a mean of
70 seconds and a standard deviation of 15 seconds.
a) If a student takes 100 seconds to complete the maze, what
percentile would the student be?
b) What percentage of students complete the maze between 50 and
60 seconds?

state the null and alternative hypotheses (complete step 1 of
the hypothesis test.)
Conduct a hypothesis test to determine if the mean time to
write a stats final for 22 professors is significantly different
from 118 minutes.

The time needed to complete a final examination in a particular
college course is normally distributed with a mean of 80 minutes
and a standard deviation of 10 minutes. If students have only 100
minutes to complete the exam, what percentage of the class will not
finish the exam in time?

Read carefully through the following problems (Questions 5-8).
Each problem is accompanied by a null and an alternative
hypothesis, and each set of hypotheses includes at least one
mistake. We would like you to identify what the mistake(s)
is/are.
A claim is made that adults spend an average of $475 per year
on birthday presents. A researcher believes this value is too low,
and she sets out to gather data to test this claim. Her null and
alternative hypotheses are...

11) The time needed to complete a final examination in a
particular college course is normally distributed with a mean of 90
minutes and a standard deviation of 15 minutes. Answer the
following questions. a. What is the probability of completing the
exam in one hour or less? b. What is the probability that a student
will complete the exam in more than 60 minutes but less than 105
minutes? c. Assume that the class has 60 students and that...

The time needed to complete a final quiz in a particular college
course is normally distributed with a mean of 77 minutes and a
standard deviation of 12 minutes. Answer the following
questions.
a. What is the probability of completing the
quiz in one hour or less (to 4 decimals)?
b. What is the probability that a student will
complete the quiz in more than 60 minutes but less than 75 minutes
(to 4 decimals)?
c. Assume that the class...

The average length of time required to complete a college
achievement test is approximately normal with a mean of 65 minutes
and a standard deviation of 11 minutes. When should the test be
terminated (in minutes) if you wish to allow sufficient time for
80% of the students to complete the test? (Round your answer to two
decimal places.)
____________ min

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