MATH 225N Statistics Final EXAM – Chamberlain College of Nursing
MATH 225N Statistics Final EXAM| 99 COMPLETE QUESTIONS WITH
100% RATED CORRECT ANSWERS | 2025 LATEST UPDATED | GET A+
A catalog sales company promises to deliver orders placed on the internet within 3 days. Follow-
up calls to a few randomly selected customers show that a 95% confidence interval for the
proportion of all orders that arrive on time is 88% +/- 6%. What does this mean? Is this
conclusion correct? Explain.
Between 82% and 94% of all orders arrive on time. - (answer)Not correct because this implies
certainty.
A catalog sales company promises to deliver orders placed on the internet within 3 days. Follow-
up calls to a few randomly selected customers show that a 95% confidence interval for the
proportion of all orders that arrive on time is 88% +/- 6%. What does this mean? Is this
conclusion correct? Explain.
你是想要一篇“眼睛容易阅读
的”中文文章
95% of all random samples of customers will show that 88% of orders arrive on time. -
(answer)Not correct because different samples will give different results.
A catalog sales company promises to deliver orders placed on the internet within 3 days. Follow-
up calls to a few randomly selected customers show that a 95% confidence interval for the
proportion of all orders that arrive on time is 88% +/- 6%. What does this mean? Is this
conclusion correct? Explain.
95% of all random samples of customers will show that 82% to 94% of orders arrive on time. -
(answer)Not correct because this is about the population proportion, not the sample proportion of
different samples.
A catalog sales company promises to deliver orders placed on the internet within 3 days. Follow-
up calls to a few randomly selected customers show that a 95% confidence interval for the
,proportion of all orders that arrive on time is 88% +/- 6%. What does this mean? Is this
conclusion correct? Explain.
We are 95% sure that between 82% and 94% of the orders placed by the sampled customers
arrive on time. - (answer)Not correct because we know that 88% of the orders arrive on time
with a margin of error of 6%.
A catalog sales company promises to deliver orders placed on the internet within 3 days. Follow-
up calls to a few randomly selected customers show that a 95% confidence interval for the
proportion of all orders that arrive on time is 88% +/- 6%. What does this mean? Is this
conclusion correct? Explain.
On 95% of the days, between 82% and 94% of the orders will arrive on time. - (answer)Not
correct because the parameter is talking about the interval, not the days.
Several factors are involved in the creation of a confidence interval. Among them are the sample
size, the level of confidence, and the margin of error. Is this statement true?
你是想要一篇“眼睛容易阅读
的”中文文章
For a given sample size, higher confidence means smaller margin of error. - (answer)False.
Several factors are involved in the creation of a confidence interval. Among them are the sample
size, the level of confidence, and the margin of error. Is this statement true?
For a specified confidence level, larger samples provide smaller margins of error. - (answer)True.
Several factors are involved in the creation of a confidence interval. Among them are the sample
size, the level of confidence, and the margin of error. Is this statement true?
For a fixed margin of error, larger samples provide greater confidence. - (answer)True.
, Several factors are involved in the creation of a confidence interval. Among them are the sample
size, the level of confidence, and the margin of error. Is this statement true?
For a given confidence level, halving the margin of error requires a sample twice as large. -
(answer)False.
What fraction of cars made in Japan? The computer output below summarizes the results of a
random sample of 50 autos. Explain carefully what it tells you.
z-interval for proportion
With 90.00% confidence
0.29938661< P(Japan) < 0.46984416 - (answer)On the basis of this sample, we are 90 confident
that the proportion of Japanese cars is between 29.9% and 47.0%.
Vitamin D, whether ingested as a dietary supplement or produced naturally when sunlight falls
on the skin, is essential for strong, healthy bones. The bone disease rickets was largely
你是想要一篇“眼睛容易阅读
eliminated in England during the 1950s, but now there is concern that a generation of children
more likely to watch TV or play computer games 的”中文文章
than spend time outdoors is at increased risk. A
recent study of 2700 children randomly selected from all parts of England found 20% of them
deficient in Vitamin D.
Find a 98% confidence interval. - (answer)Z*98= 2.326 (t-table bottom row)
(18.2%, 21.8%)
Vitamin D, whether ingested as a dietary supplement or produced naturally when sunlight falls
on the skin, is essential for strong, healthy bones. The bone disease rickets was largely
eliminated in England during the 1950s, but now there is concern that a generation of children
more likely to watch TV or play computer games than spend time outdoors is at increased risk. A
recent study of 2700 children randomly selected from all parts of England found 20% of them
deficient in Vitamin D.
MATH 225N Statistics Final EXAM| 99 COMPLETE QUESTIONS WITH
100% RATED CORRECT ANSWERS | 2025 LATEST UPDATED | GET A+
A catalog sales company promises to deliver orders placed on the internet within 3 days. Follow-
up calls to a few randomly selected customers show that a 95% confidence interval for the
proportion of all orders that arrive on time is 88% +/- 6%. What does this mean? Is this
conclusion correct? Explain.
Between 82% and 94% of all orders arrive on time. - (answer)Not correct because this implies
certainty.
A catalog sales company promises to deliver orders placed on the internet within 3 days. Follow-
up calls to a few randomly selected customers show that a 95% confidence interval for the
proportion of all orders that arrive on time is 88% +/- 6%. What does this mean? Is this
conclusion correct? Explain.
你是想要一篇“眼睛容易阅读
的”中文文章
95% of all random samples of customers will show that 88% of orders arrive on time. -
(answer)Not correct because different samples will give different results.
A catalog sales company promises to deliver orders placed on the internet within 3 days. Follow-
up calls to a few randomly selected customers show that a 95% confidence interval for the
proportion of all orders that arrive on time is 88% +/- 6%. What does this mean? Is this
conclusion correct? Explain.
95% of all random samples of customers will show that 82% to 94% of orders arrive on time. -
(answer)Not correct because this is about the population proportion, not the sample proportion of
different samples.
A catalog sales company promises to deliver orders placed on the internet within 3 days. Follow-
up calls to a few randomly selected customers show that a 95% confidence interval for the
,proportion of all orders that arrive on time is 88% +/- 6%. What does this mean? Is this
conclusion correct? Explain.
We are 95% sure that between 82% and 94% of the orders placed by the sampled customers
arrive on time. - (answer)Not correct because we know that 88% of the orders arrive on time
with a margin of error of 6%.
A catalog sales company promises to deliver orders placed on the internet within 3 days. Follow-
up calls to a few randomly selected customers show that a 95% confidence interval for the
proportion of all orders that arrive on time is 88% +/- 6%. What does this mean? Is this
conclusion correct? Explain.
On 95% of the days, between 82% and 94% of the orders will arrive on time. - (answer)Not
correct because the parameter is talking about the interval, not the days.
Several factors are involved in the creation of a confidence interval. Among them are the sample
size, the level of confidence, and the margin of error. Is this statement true?
你是想要一篇“眼睛容易阅读
的”中文文章
For a given sample size, higher confidence means smaller margin of error. - (answer)False.
Several factors are involved in the creation of a confidence interval. Among them are the sample
size, the level of confidence, and the margin of error. Is this statement true?
For a specified confidence level, larger samples provide smaller margins of error. - (answer)True.
Several factors are involved in the creation of a confidence interval. Among them are the sample
size, the level of confidence, and the margin of error. Is this statement true?
For a fixed margin of error, larger samples provide greater confidence. - (answer)True.
, Several factors are involved in the creation of a confidence interval. Among them are the sample
size, the level of confidence, and the margin of error. Is this statement true?
For a given confidence level, halving the margin of error requires a sample twice as large. -
(answer)False.
What fraction of cars made in Japan? The computer output below summarizes the results of a
random sample of 50 autos. Explain carefully what it tells you.
z-interval for proportion
With 90.00% confidence
0.29938661< P(Japan) < 0.46984416 - (answer)On the basis of this sample, we are 90 confident
that the proportion of Japanese cars is between 29.9% and 47.0%.
Vitamin D, whether ingested as a dietary supplement or produced naturally when sunlight falls
on the skin, is essential for strong, healthy bones. The bone disease rickets was largely
你是想要一篇“眼睛容易阅读
eliminated in England during the 1950s, but now there is concern that a generation of children
more likely to watch TV or play computer games 的”中文文章
than spend time outdoors is at increased risk. A
recent study of 2700 children randomly selected from all parts of England found 20% of them
deficient in Vitamin D.
Find a 98% confidence interval. - (answer)Z*98= 2.326 (t-table bottom row)
(18.2%, 21.8%)
Vitamin D, whether ingested as a dietary supplement or produced naturally when sunlight falls
on the skin, is essential for strong, healthy bones. The bone disease rickets was largely
eliminated in England during the 1950s, but now there is concern that a generation of children
more likely to watch TV or play computer games than spend time outdoors is at increased risk. A
recent study of 2700 children randomly selected from all parts of England found 20% of them
deficient in Vitamin D.
