Question

A research center claims that less than 70% of U.S. adults think that drivers are safer using hands-free cell phones instead of using hand-held cell phones. In a random sample of 50 U.S. adults, 60% think that drivers are safer using hands-free cell phones instead of hand-held cell phones. Assume you wish to test is there enough evidence to reject the center’s claim with alpha = 0.10. Compute the test statistics.

Answer #1

2. 7.4 QUESTION 5 A research center claims that at most 77% of
adults in a certain country think that drivers are safer using
hands-free cell phones instead of using hand-held cell phones. In a
random sample of 150 adults from that country, 80% think that
drivers are safer using hands-free cell phones instead of using
hand-held cell phones. At αequals=0.01, is there enough evidence to
reject the center's claim? Complete parts (a) through (e) below.
b.
(a)Identify HO and...

A research center claims that at most 18% of U.S. adults’ online
food purchases are for snacks. In a random sample of 1995 U.S.
adults, 20% say their online food purchases are for snacks. At ? =
0.05, is there enough evidence to support the center’s claim?
a.) Identify ?0∶ _______________ and ??: ____________
b.) Find the standardized test statistic, z. ? = ?̂ ̅−?
√??/?
c.) For = 0.05, find and describe the rejection region. Identify
and label the...

A research center claims that at least 31% of adults in a
certain country think that their taxes will be audited. In a random
sample of 700 adults in that country in a recent year, 27% say
they are concerned that their taxes will be audited. At
alphaαequals=0.10, is there enough evidence to reject the
center's claim? Complete parts (a) through(e) below.
(c) Find the standardized test statistic z.
(Round to two decimal places as needed.)
(d) Decide whether to...

A research center claims that less than 50% of the US adults
have accessed the internet over a wireless network with a laptop
computer. In a random sample of 100 adults, 39% say that they have
accessed the internet over a wireless network with a laptop
computer. At α=0.01, is there enough evidence to support the
researcher’s claim?

A researcher claims that 45% of U.S. adults think that the IRS
is not aggressive enough in pursuing people who cheat on their
taxes. You believe the true percentage is more than 45%. To test
this, you take a simple random sample of 400 U.S. adults and find
that 208 of them say the IRS is not aggressive enough. Test at
significance α= .10. Round to the fourth

The Pew Research Center reported in 2018 that 68% of U.S. adults
rated "reducing health care costs" as a national priority. This
year a survey is conducted with a national sample of 1,505 U.S.
adults selected by a combination of landline and cell phone random
digit dials. This year's survey finds that 70% of the sample says
that "reducing health care costs" is a national priority. We test
the following hypotheses: LaTeX: H_0 H 0 : The proportion of U.S....

A research center claims that more than 29% of US employees have
changed jobs in the past three years. In a random sample of 180 US
employees, 63 have changed jobs in the past three years. At a=0.10,
is there enough evidence to reject the null
hypothesis? Ho:
p <= 0.29 Ha: p>0.29.

A research center claims that more than 65% of US adults have
used a cellular phone to access the internet. In a random sample of
125 adults, 69% say that they have used a cellular phone to access
the internet. The value of the test statistic is about
A 0.69
B -0.94
C 0.65
D 0.94
E -0.65

A humane society claims that less than 33% of U.S. households
own a dog. In a random sample of 404 U.S. households, 152 say they
own a dog. At a =0.10, is there enough evidence to support the
society's claim? (a) Write the claim mathematically and identify
H0 and Ha. (b) Find the critical value(s) and identify the
rejection region(s). (c) Find the standardized test statistic.
(d) Decide whether to reject or fail to reject the null
hypothesis, and (e)...

The Pew Research Center claims that at least 65% of U.S.
citizens favor a tax increase to pay for new schools. You decide to
test this claim and ask a random sample of 50 citizens, and 27
favor the new tax. Use to test this claim.
a) State the claim (use a sentence), b) and place the claim with
either one of the two. c) Test statistic, show and label the
formula you use. d) Find critical value(s), and reject...

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