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STATISTIKA STKR 2270
Use the sample data given in the table below, to construct a 90% confidence int...

Use the sample data given in the table below, to construct a 90% confidence int...

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Use the sample data given in the table below, to construct a 90% confidence interval estimate of the difference between the

two population proportions. The confidence level of 90% is comparable to the

significance level of a = 0.05 used in a two tailed hypothesis test.

What

does the result suggest about the effectiveness of a safety belt in an

accident?

Safety

Belt Used Safety

Belt Not used

Occupant

Fatalities 123 110

Total

number of occupants 22,501 18,543

Choose the best answer.

-0.0038 <

(p1 - p2) < 0.0016

The confidence interval limits contain 0, implying that there is a significant difference between the two

proportions. The confidence interval suggests that the fatality rate is lower

for occupants in cars with used safety belt than for occupants in cars without

the use of it.

0%

-0.0038 <

(p2 - p1) < -0.0016

The confidence interval limits do not

contain 0, implying that there is a significant difference between the two

proportions. The confidence interval suggests that the fatality rate is lower

for occupants in cars with used safety belt than for occupants in cars without

the use of it.

0%

-0.0005 <

(p1 - p2) < -0.001

The confidence interval limits do not

contain 0, implying that there is a significant difference between the two

proportions. The confidence interval suggests that the fatality rate is lower

for occupants in cars with used safety belt than for occupants in cars without

the use of it.

0%

P-value = 1.9E-2 thus H(alternative) is accepted

0%

-0.0038 <

(p1 - p2) < -0.0016

The confidence interval limits do not

contain 0, implying that there is a significant difference between the two

proportions. The confidence interval suggests that the fatality rate is lower

for occupants in cars with used safety belt than for occupants in cars without

the use of it.

0%

0.0038 <

(p1 - p2) < 0.006

The confidence interval limits do not

contain 0, implying that there is a significant difference between the two

proportions. The confidence interval suggests that the fatality rate is lower

for occupants in cars with used safety belt than for occupants in cars without

the use of it.

0%

-0.004 <

(p1 - p2) < -0.008

The confidence interval limits do not

contain 0, implying that there is a significant difference between the two

proportions. The confidence interval suggests that the fatality rate is lower

for occupants in cars without the use of safety belt than for occupants in cars with the use of it.

0%

-0.003 <

(p1 - p2) < -0.001

The confidence interval limits do not

contain 0, implying that there is a significant difference between the two

proportions. The confidence interval suggests that the fatality rate is lower

for occupants in cars with used safety belt than for occupants in cars without

the use of it.

0%

-0.00138 <

(p1 - p2) < -0.00116

The confidence interval limits do not

contain 0, implying that there is a significant difference between the two

proportions. The confidence interval suggests that the fatality rate is lower

for occupants in cars with used safety belt than for occupants in cars without

the use of it.

0%

P-value = 1.5579E+2 thus H(alternative) is accepted

0%

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