Question

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 below.

H_{o}: *x* = $475

H_{a}: *x* >
$475

- It is claimed that 52% of college students own an iPad. You believe a different proportion of college students own an iPad. Your null and alternative hypotheses are below.

H_{o}: *p* = 0.52

H_{a}: *p*
< 0.52

- It is claimed that high school students across the country spend an average of 10.7 hours per week working at a part-time job. Teachers at one high school worry their students are spending too much time working at part-time jobs and not enough time studying. To determine if these students spend significantly more than 10.7 hours per week working at part-time jobs, they survey a random sample of 45 students. They find the sample average number of hours working at part-time jobs per week to be 12.5. They plan to conduct a hypothesis test, and they begin with the following hypotheses:

H_{o}: µ = 12.5

H_{a}: µ < 12.5

- Researchers claim that 240 seconds is the average amount of time people spend brushing their teeth per day. You think the true average is less than 240 seconds. You write out the following null and alternative hypotheses.

H_{o}: *p* = 120

H_{a}: *p* < 120

Answer #1

1)

Below are the null and alternative Hypothesis,

Null Hypothesis, H0: μ = 475

Alternative Hypothesis, Ha: μ < 475

2)

Below are the null and alternative Hypothesis,

Null Hypothesis, H0: p = 0.52

Alternative Hypothesis, Ha: p ≠ 0.52

3)

Below are the null and alternative Hypothesis,

Null Hypothesis, H0: μ = 10.7

Alternative Hypothesis, Ha: μ > 10.7

4)

Below are the null and alternative Hypothesis,

Null Hypothesis, H0: μ = 240

Alternative Hypothesis, Ha: μ < 240

A class survey in a large class for first-year college students
asked, "About how many hours do you study during a typical week?"
The mean response of the 493 students was x = 15.3 hours. Suppose
that we know that the study time follows a Normal distribution with
standard deviation σ = 8.5 hours in the population of all
first-year students at this university.
Regard these students as an SRS from the population of all
first-year students at this university....

The China Health and Nutrition Survey aims to examine the
effects of the health, nutrition, and family planning policies and
programs implemented by national and local governments. It, for
example, collects information on number of hours Chinese parents
spend taking care of their children under age 6. The side-by-side
box plots below show the distribution of this variable by
educational attainment of the parent. Also provided below is the
ANOVA output for comparing average hours across educational
attainment categories.
Df...

Use the following information to answer questions 13-17: The
belief is that the mean number of hours per week of part-time work
of high school seniors in a city is 10.7 hours. Data from a simple
random sample of 24 high school seniors indicated that their mean
number of part-time work was 11.6 with a standard deviation of 1.4.
Test whether these data cast doubt on the current belief. (use α =
0.05) Part a: State your null and alternative...

A class survey in a large class for first‑year college students
asked, “About how many hours do you study during a typical week?”
The mean response of the 463463 students was ?¯=13.7x¯=13.7 hours.
Suppose that we know that the study time follows a Normal
distribution with standard deviation ?=7.4σ=7.4 hours in the
population of all first‑year students at this university.
Regard these students as an SRS from the population of all
first‑year students at this university. Does the study give...

Use the following information to answer Questions 1 through
3
The manager of OfficeSpace Inc. wishes to determine whether
employees with an office spend more or less “down time” on the
computer than employees working in a cubicle. She tracks the
monitors of 7 cubicle-workers (denoted as X) and 3 office-workers
for 8 hours each. She finds that the cubicle-workers spend an
average of 38 minutes of “down time,” and the office-workers spend
an average of 49 minutes of “down...

A survey in a large class for first-year college students asked,
"About how many hours do you study during a typical week?" The mean
response of the 461 students was
x = 15.3 hours.
Suppose that we know that the study time follows a Normal
distribution with standard deviation
σ = 8.5 hours
for all first-year students at this university.
Does the survey results provide evidence (at the 0.05 level) of
students claiming to study more than 15 hours per...

A class survey in a large class for first-year college students
asked, "About how many hours do you study during a typical week?"
The mean response of the 468 students was x = 15.3 hours. Suppose
that we know that the study time follows a Normal distribution with
standard deviation σ = 8.5 hours in the population of all
first-year students at this university.
Regard these students as an SRS from the population of all
first-year students at this university....

How do I get the P value for this problem? ...
In a General Social Survey, respondents working full time or
part time reported how many hours they worked in the previous week
at all jobs. The random sample of 1,729 produced a mean of 41.8
hours with a standard deviation of 14.6 hours. Using these data
what would you conclude in a test of the following hypothesis?
Ho: M = 40 hours
Ha: M > 40 hours
The teacher...

1. The belief is that the mean number of hours per week of
part-time work of high school seniors in a city is 10.7 hours. Data
from a simple random sample of 28 seniors indicated that their mean
number of parttime work was 12.5 with a standard deviation of 1.3.
Test whether these data cast doubt on the current belief. (use α =
0.05)
a.)State your null and alternative hypotheses.
b.)Sketch the rejection region.
c.) Calculate the test statistic. Plot...

What role could the governance of ethics have played
if it had been in existence in the organization? Assess the
leadership of Enron from an ethical perspective.
THE FALL OF ENRON: A STAKEHOLDER FAILURE
Once upon a time, there was a gleaming headquarters
office tower in Houston, with a giant tilted "£"' in front, slowly
revolving in the Texas sun. The Enron Corporation, which once
ranked among the top Fortune 500 companies, collapsed in 2001 under
a mountain of debt...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 2 minutes ago

asked 2 minutes ago

asked 2 minutes ago

asked 2 minutes ago

asked 3 minutes ago

asked 5 minutes ago

asked 5 minutes ago

asked 7 minutes ago

asked 7 minutes ago

asked 7 minutes ago

asked 10 minutes ago

asked 16 minutes ago