A simple random sample of size n=200 drivers with a validdriver's license is asked if they drive anAmerican-made automobile. Of the 200 driverssurveyed, 103 responded that they drive anAmerican-made automobile. Determine if a majority of those with a validdriver's license drive anAmerican-made automobile at the =0.05 level of significance.

What type of variable is"drive anAmerican-made automobile, ornot"?

A simple random sample of size n=14 is drawn from a population that is normally distributed. The sample mean is found to be x=21.3 and the sample standard deviation is found to be s=5.9. Determine if the population mean is different from 24 at the =0.01 level of significance. Complete parts(a) through(d) below.

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(a) Determine the null and alternative hypotheses.

H0:

s

s

ModifyingAbove p with caret

p

mu

p

p

sigma

x overbar

x

not equals

less than

<

equals

=

greater than

>

nothing

H1:

sigma

s

s

mu

x overbar

x

p

p

ModifyingAbove p with caret

p

greater than

>

equals

=

less than

<

not equals

nothing

(Type integers or decimals. Do notround

A simple random sample of size n=40 is drawn from a population. The sample mean is found to be x=127.4, and the sample standard deviation is found to be s=15.1. Is the population mean greater than 120 at the =0.05 level ofsignificance?

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Click here to view the standard normal distribution table (page 2).LOADING...

Click here to view the table of critical t-values.LOADING...

Determine the null and alternative hypotheses.

H0:

ModifyingAbove p with caret

p

x overbar

x

p

p

sigma

mu

s

s

greater than

>

less than

<

equals

=

not equals

nothing

H1:

mu

sigma

x overbar

x

ModifyingAbove p with caret

p

s

s

equals

=

less than

<

not equals

greater than

>

nothing

(Type integers or decimals. Do notround.)

n 1945, an organization asked 1513 randomly sampled Americancitizens, "Do you think we can develop a way to protect ourselves from atomic bombs in case others tried to use them againstus?" with 787 responding yes. Did a majority of the citizens feel the country could develop a way to protect itself from atomic bombs in 1945? Use the =0.1 level of significance.

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Click here to view the standard normal distribution table (page 2).LOADING...

What are the null and alternativehypotheses?

H0:

mu

sigma

p

p

greater than

>

less than

<

equals

=

not equals

nothing

versus H1:

sigma

mu

p

p

greater than

>

less than

<

not equals

equals

=

nothing

(Type integers or decimals. Do notround.)