Quantitative Reasoning Final Exam / Accurate Expert Verified Actual
Quantitative Reasoning Final Exam
Questions & Answers for Guaranteed Pass | Newest Update,
Study online at https://quizlet.com/_7ns10y
1. Graphs of normal distributions always have the same
characteristic bell shape
2. In a normal distribution, the mean is equal to the median
3. In a normal distribution, data values farther from the less common than data
mean are values close to the mean
4. Consider wages at a fast food restaurant where most no, because a normal dis-
of the workers earn the minimum wage. Would you tribution is symmetric, but
expect the wages of all workers at this restaurant to no one earns less than the
have a normal distribution? minimum wage
5. In a normal distribution, about two-thirds of the data 1 standard deviation of the
values fall within mean
6. Suppose a car driven under different conditions gets 34 and 46 miles per gallon
a mean gas mileage of 40 miles per gallon with a
standard deviation of 3 miles per gallon. If you drive
this car many times, the gas mileage on 95% of the
trips will be between
7. Consider again the car described in question 6. On 16%
about what percentage of the trips will the gas mileage
be less than 37 miles per gallon?
8. Consider an exam with a normal distribution of scores -1.5
with a mean of 75 and a standard deviation of 6. If you
get a 66 on the exam, your standard score (z-score) is
9. A friend tells you that his IQ is in the 102nd percentile. he doesn't understand
You can conclude that percentiles
10.
1/9
, Quantitative Reasoning Final Exam
Study online at https://quizlet.com/_7ns10y
Researchers are testing a new cancer treatment. To compare the survival rate
determine whether the treatment offers a statistical- with the new treatment to
ly significant improvement in survival rates, the re- that with other treatments
searchers must or no treatment
11. Working with equal sample sizes, researchers com- the one that gave results
pared three new cold remedies to a placebo. Which statistically significant at
remedy is most likely to be most effective? the 0.01 level
12. Researchers conduct 20 different experiments to test there is no evidence that
the effectiveness of a new weight loss pill compared the treatment works
to the effectiveness of a placebo. For 19 of the 20 ex-
periments, the results are not statistically significant.
However, one of the experiments shows that the pill
works better than the placebo with statistical signifi-
cance at the 0.05 level. A fair report of the combined
results from all 20 experiments would say that
13. A poll finds that 35% of the people surveyed approve 32% to 38%
of the President's handling of the economy, with a
margin of error (for 95% confidence) of 3%. The 95%
confidence interval for this poll is
14. Suppose the poll described in question 5 were repeat- the two polls results do not
ed one month later (with a new sample) and 33% of the differ enough to allow us
people surveyed approve of the President's handling to draw a conclusion about
of the economy. Which is the correct conclusion about any change
the percentage of the population that approves of the
President's handling of the economy?
15. Consider a survey with a margin of error of 4%. If you four times as many people
want to reduce the margin of error to 2%, you should
repeat the survey with
2/9
Quantitative Reasoning Final Exam
Questions & Answers for Guaranteed Pass | Newest Update,
Study online at https://quizlet.com/_7ns10y
1. Graphs of normal distributions always have the same
characteristic bell shape
2. In a normal distribution, the mean is equal to the median
3. In a normal distribution, data values farther from the less common than data
mean are values close to the mean
4. Consider wages at a fast food restaurant where most no, because a normal dis-
of the workers earn the minimum wage. Would you tribution is symmetric, but
expect the wages of all workers at this restaurant to no one earns less than the
have a normal distribution? minimum wage
5. In a normal distribution, about two-thirds of the data 1 standard deviation of the
values fall within mean
6. Suppose a car driven under different conditions gets 34 and 46 miles per gallon
a mean gas mileage of 40 miles per gallon with a
standard deviation of 3 miles per gallon. If you drive
this car many times, the gas mileage on 95% of the
trips will be between
7. Consider again the car described in question 6. On 16%
about what percentage of the trips will the gas mileage
be less than 37 miles per gallon?
8. Consider an exam with a normal distribution of scores -1.5
with a mean of 75 and a standard deviation of 6. If you
get a 66 on the exam, your standard score (z-score) is
9. A friend tells you that his IQ is in the 102nd percentile. he doesn't understand
You can conclude that percentiles
10.
1/9
, Quantitative Reasoning Final Exam
Study online at https://quizlet.com/_7ns10y
Researchers are testing a new cancer treatment. To compare the survival rate
determine whether the treatment offers a statistical- with the new treatment to
ly significant improvement in survival rates, the re- that with other treatments
searchers must or no treatment
11. Working with equal sample sizes, researchers com- the one that gave results
pared three new cold remedies to a placebo. Which statistically significant at
remedy is most likely to be most effective? the 0.01 level
12. Researchers conduct 20 different experiments to test there is no evidence that
the effectiveness of a new weight loss pill compared the treatment works
to the effectiveness of a placebo. For 19 of the 20 ex-
periments, the results are not statistically significant.
However, one of the experiments shows that the pill
works better than the placebo with statistical signifi-
cance at the 0.05 level. A fair report of the combined
results from all 20 experiments would say that
13. A poll finds that 35% of the people surveyed approve 32% to 38%
of the President's handling of the economy, with a
margin of error (for 95% confidence) of 3%. The 95%
confidence interval for this poll is
14. Suppose the poll described in question 5 were repeat- the two polls results do not
ed one month later (with a new sample) and 33% of the differ enough to allow us
people surveyed approve of the President's handling to draw a conclusion about
of the economy. Which is the correct conclusion about any change
the percentage of the population that approves of the
President's handling of the economy?
15. Consider a survey with a margin of error of 4%. If you four times as many people
want to reduce the margin of error to 2%, you should
repeat the survey with
2/9
