Question

A simple random sample of 200 drivers were asked if they drive
a car manufactured in a certain

country. Of the 200 drivers surveyed, 120 responded that they
did. Test the claim that more than 50% of

all drivers drive a car made in this country at the 0.05 level
of significance.

(For full credit need to draw

the curve and shade the area)

Answer #1

The null and alternate hypothesis are:

H0:

Ha:

The test statistic value is given by:

Since this is a right tailed test, so the critical-value is given by:

Since test statistic is greater than critical-value, so we have
sufficient evidence to reject the null hypothesis

H0.

Thus we can conclude that .

A simple random sample of size n equals n=200 individuals who
are currently employed is asked if they work at home at least once
per week. Of the 200 employed individuals surveyed,40 responded
that they did work at home at least once per week. Construct a 99%
confidence interval for the population proportion of employed
individuals who work at home at least once per week. Find Lower and
Upper Bound

A simple random sample of front-seat occupants involved in car
crashes is obtained. Among 2500 occupants not wearing seat belts,
15 were killed. Among 7500 occupants wearing seat belts, 15 were
killed. Use this data with 0.05 significance level to test the
claim that the fatality rate is higher for those not wearing seat
belts. (Write all necessary steps like Hypotheses, Test Statistic,
P-value & Conclusion) Given that P(z<3.17)=0.9992.

MK Restaurant: Branding of Thai-Style Hotpot
The restaurant industry is one of the most competitive in
Thailand. With a large number of players ranging from restaurants
in five-star hotels, global fast-food chains to small stalls along
the streets and everything in between, the Thais are spoiled for
choice. In addition, as the world becomes globalized, consumers are
familiar with international dishes and would not hesitate to try
new offerings from the other side of the globe. As a...

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