Question

A polling company finds that 60% of Democrats give a
‘favorable’ rating for a senator and 52% of Republicans give a
‘favorable’ rating for the same senator. What should the company
use if they want to know if this is a ‘statistically significant’
finding?

a. Independent two sample t-test

b. Two proportions z-test

c. One sample t-test

d. Matched pairs t-test

Answer #1

Two proportions z-test.

A z-test for two proportions is a hypothesis test that attempts
to make a claim about the population proportions p_{1} and
p_{2}. Specifically, we are interested in assessing whether
or not it is reasonable to claim that p_{1} =
p_{2.}

The Z-test for two proportions has two non-overlapping hypotheses, the null and the alternative hypothesis.

The null hypothesis is a statement about the population parameter which indicates no effect, and the alternative hypothesis is the complementary hypothesis to the null hypothesis.

QUESTION 27
Suppose we want to know whether students feel more stressed at
the beginning of the semester or at the end of the semester. We
take a random sample of students. Midway through the first week of
classes, we ask the students to rate their current stress level on
a scale from 0 (completely relaxed) to 100 (completely stressed
out). Midway through the last week of classes, we ask the same
students to rate their current stress level using...

“Eat For 10 Hours. Fast For 14. This Daily Habit Prompts Weight
Loss, Study Finds” This is the title of an NPR article about a 2019
study that recruited 19 overweight adults diagnosed with metabolic
syndrome (elevated blood sugar, elevated cholesterol levels,
high blood pressure). Participants were asked to restrict any
eating to a period of just 10 hours each day. The study found a
statistically significant reduction in body weight after 12 weeks
of this eating pattern.
1.
Define...

1. Which of the following scenarios could BEST be tested with a
matched pairs or dependent samples t-test? Choose the BEST
answer.
a. When you want to compare mean number of hurricanes in both
El Niño and La Niña years
b. When you want to see if there is a statistically significant
relationship between increased urbanization and an increase in
deaths from hyperthermia
c. When you want to see if there is a difference in the number
of people who...

Two movie theaters are across the street from one another, in
direct competition! Theater A takes a sample of 50 days, and finds
that in that sample an average of 547 customers come through the
theater each day, with a standard deviation of 42. They proudly
display their results. Theater B takes a sample of 30 days and
finds that in their sample, they have an average of 571 customers,
with a standard deviation of 59. They claim this means...

The Hartford Insurance Company obtains a simple random
sample of 850 drivers and finds that 544 of them text while
driving. Using a .01 level of significance, test the claim that the
probability of texting while driving is greater than
60%.
List all the information necessary for conducting the
hypothesis test and state which
test you are doing.
(2) State the null and alternative hypotheses and
whether you would use a right-tailed
test, a left-tailed test, or a two-tailed
test....

T-tests are used when you want to examine differences but you do
not know everything about the population. There are three types of
t-tests that you may choose to do: one-sample t-test, independent
sample t-test, or dependent sample t-test. You can calculate these
by hand, in SPSS, or in Excel. The instructions below can be used
for SPSS and your textbook offers instructions for using Excel.
Single-sample t-tests
These tests are used when you want to determine the
probability that...

Match each of the research designs below to the
appropriate statistical test from the list below.
z Test
Single Sample t-Test
Paired Samples t-Test
Independent Samples t-test
One-way Between-Groups Analysis of
Variance
One-way Within-Subjects Analysis of
Variance
Two-way Analysis of Variance
Correlation
You have two nominal independent variables and one scale
dependent variable. For example, you want to know if the various
types of cholesterol drug are more effective at lowering
cholesterol and if this effectiveness is different for men...

A news article reports that "Americans have differing views on
two potentially inconvenient and invasive practices that airports
could implement to uncover potential terrorist attacks." This news
piece was based on a survey conducted among a random sample of 1108
adults nationwide, interviewed by telephone November 7-10, 2010,
where one of the questions on the survey was "Some airports are now
using 'full-body' digital x-ray machines to electronically screen
passengers in airport security lines. Do you think these new x-ray...

2) A market research company wishes to find out which of two
internet search engines the
population of students at a university prefers to use: Google or
MSN Search. A random sample
of students is selected, and each one is asked to search for a
certain subject using Google and
then MSN, or vice versa. The order of the two searches was
determined at random. They then
indicate which internet search engine they prefer. What type of
study is this?...

1) Psychologists know that people find it easier to remember
items at the beginning and at the end of a list of items. Suppose
you think that level of education might make a difference to the
tendency to remember items in the middle of the list. You randomly
select two groups of subjects, with N = 10 in each
group. Participants in Group 1 have 12 years of
education, and members of group 2 have 20 years of education. Which...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 3 minutes ago

asked 4 minutes ago

asked 7 minutes ago

asked 21 minutes ago

asked 21 minutes ago

asked 21 minutes ago

asked 44 minutes ago

asked 46 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago