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In: Math
A recent poll asked people whether they supported passing a constitutional amendment to ban burning of...
- A recent poll asked people whether they supported passing a constitutional amendment to ban burning of the national flag using a 1 to 100 scale.”1” means that they do not support passing the amendment at all and “100” means they support it completely. The sample was random (from the population of US adults) and included 986 people, 400 of whom were women, and 586 were men. The mean score for women was 80.6, while the mean score for men was 77.6.
- Is the difference in means test statistically significant at the 5% level? Assume the standard deviation for both men and women is 3.5. Show your work.
- If the standard deviation for men is 1.4 and the standard deviation for women is 1.2, is the difference in means statistically significant at the 5% level? Show your work.
2- Why are large sample sizes usually better for making inferences
about populations? Explain your answer (on the rest of this
page).
Solutions
milcah answered 1 year agoRelated Solutions
In a survey of 3135 adults in a nation, a poll asked people whether they smoked...
In a survey of 3135 adults in a nation, a poll asked people
whether they smoked cigarettes and whether they always wear a seat
belt in a car. The table available below shows the results of the
survey. For each activity, we define a success as finding an
individual who participates in the hazardous activity. Complete
parts (a) and (b) below. LOADING... Click the icon to view the
survey results. (a) Why is this a dependent sample? A. This is...
In a survey of 3135 adults in a nation, a poll asked people whether they smoked...
In a survey of 3135 adults in a nation, a poll asked people
whether they smoked cigarettes and whether they always wear a seat
belt in a car. The table available below shows the results of the
survey. For each activity, we define a success as finding an
individual who participates in the hazardous activity. Complete
parts (a) and (b) below. LOADING... Click the icon to view the
survey results. (a) Why is this a dependent sample? A. This is...
An online poll at a popular web site asked the following: A nationwide ban of the...
An online poll at a popular web site asked the following:
A nationwide ban of the diet supplement ephedra went into effect
recently. The herbal stimulant has been linked to 155 deaths and
many more heart attacks and strokes. Ephedra manufacturer NVE
Pharmaceuticals, claiming that the FDA lacked proof that ephedra is
dangerous if used as directed, was denied a temporary restraining
order on the ban yesterday by a federal judge. Do you think that
ephedra should continue to be...
In a recent poll, 120 people were asked if they liked dogs, and 60% said they...
In a recent poll, 120 people were asked if they liked dogs, and
60% said they did. Find the margin of error of this poll, at the
90% confidence level.
Give your answer to three decimals
In a recent poll, 250 people were asked if they liked dogs, and 47% said they...
In a recent poll, 250 people were asked if they liked dogs, and
47% said they did. Find the margin of error of this poll, at the
90% confidence level.
Give your answer to three decimals
In a recent poll, 160 people were asked if they liked dogs, and 55% said they...
In a recent poll, 160 people were asked if they liked dogs, and
55% said they did. Find the margin of error of this poll, at the
99% confidence level.
Give your answer to three decimals
If n=28, ¯xx¯(x-bar)=33, and s=7, find the margin of error at a
80% confidence level
Give your answer to two decimal places.
In Tokyo, 834 Japanese people were asked in a poll on whether they thought the Olympics...
In Tokyo, 834 Japanese people were asked in a poll on whether
they thought the Olympics reduced international tension, increased
international tension, or neither. 425 of them said that they
thought the Olympics reduced international tension. Calculate a
97.5% confidence interval for the proportion of those who believed
this.
A 2010 poll asked people in the United States whether they were satisfied with their financial...
A
2010
poll asked people in the United States whether they were
satisfied with their financial situation. A total of
338
out of
833
people said they were satisfied. The same question was asked
in
2012
, and
304
out of
1156
people said they were satisfied.
Part 1 of 2
Your Answer is correct
(a) Construct a
99.8%
confidence interval for the difference between the proportions
of adults who said they were satisfied in
2012
and
2010
. Let...
A 2010 poll asked people in the United States whether they were satisfied with their financial...
A
2010
poll asked people in the United States whether they were
satisfied with their financial situation. A total of
338
out of
833
people said they were satisfied. The same question was asked
in
2012
, and
304
out of
1156
people said they were satisfied.
Part: 0 / 2
0 of 2 Parts Complete
Part 1 of 2
(a) Construct a
99.8%
confidence interval for the difference between the proportions
of adults who said they were satisfied in...
1.) In a recent poll, 100 people were asked if they liked cats, and 81% said...
1.)
In a recent poll, 100 people were asked if they liked cats, and
81% said they did. Based on this, construct a 99% confidence
interval for the true population proportion of people who like
cats.
Use the following approximate critical values (z-scores) to perform
the calculations by hand:
--Use z = 1.645 for a 90% confidence interval
--Use z = 2 for a 95% confidence interval
--Use z = 2.576 for a 99% confidence interval.
Give your answers as...
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