STATS Quizzes And Chapters 1-3
Questions With Accurate Answers
___________% of the data are less than the median. correct answer 50%
2) ____% of the data are less than the median. correct answer 50%
3. The distribution of bladder volume in men is approximately Normal with mean
550 ml and standard deviation 100 ml. What percent of men have a bladder
volume smaller than 450 ml? Round you answer to the nearest whole number.
correct answer (16 and) 450 ml is one standard deviation below the mean. We
expect about 68% of all men to have bladder volumes within one standard
deviation of 550. The remaining 32% is split in half because of symmetry.
A good use of z-scores is to compare values in two different distributions.
Suppose your instructor will drop the low test when computing final grades, but
he curves grades on each test. You had a 92 on the first test, and an 85 on the
second. The first test had a mean of 83 and standard deviation of 6. The second
test had a mean of 75 and standard deviation 3. The test with the relatively better
score is ____________. correct answer Test 2
Compute a z-score for each test. The first is (92 - 83)/6 = 1.5. The second is (85 -
75)/3 = 3.333.
A good use of z-scores is to compare values in two different distributions.
Suppose your instructor will drop the low test when computing final grades, but
he curves grades on each test. You had a 92 on the first test, and an 85 on the
second. The first test had a mean of 83 and standard deviation of 6. The second
,test had a mean of 75 and standard deviation 3. The z-score for your second test
is ______. Round your answer to two decimal places. correct answer 3.33
The z-score is (85 - 75)/3 = 3.33.
A good use of z-scores is to compare values in two different distributions.
Suppose your instructor will drop the low test when computing final grades, but
he curves grades on each test. You had a 92 on the first test, and an 85 on the
second. The first test had a mean of 83 and standard deviation of 6. The second
test had a mean of 75 and standard deviation 3. The z-score for your second test
is ______. Round your answer to two decimal places. correct answer The z-score
is (85 - 75)/3 = 3.33.
A shopper at a local supermarket spent the following amounts in her last eight
trips to the store: $32.92 $14.14 $30.80 $28.34 $75.58 $36.33 $33.51 $22.94 The
amount spent of _________ is most likely an outlier. Give answer as $XX.XX.
correct answer The amount spent of $75.58 is considerably more than any of the
other amounts.
A shopper at a local supermarket spent the following amounts in his last eight
trips to the store: $32.92 $14.14 $30.80 $27.34 $28.34 $75.58 $27.42 $22.94 The
value of the median is _________________. Give answer as $XX.XX. correct
answer $27.88
A shopper at a local supermarket spent the following amounts in his last eight
trips to the store: $32.92 $14.14 $30.80 $28.34 $75.58 $36.33 $33.51 $22.94 The
mean of these data is $34.32. If the amount of $75.58 were a typo and should be
$25.58, what would happen to the mean? correct answer The mean would
decrease. Since $25.58 would be added instead of $75.58, the sum would be
smaller and the mean would be smaller.
, A survey of college students collected information on several variables: Distance
from Home, Age, Major, Gender, and Class. The variable Class is correct answer
categorical.
A university wants to select individuals for their honors program partly on the
basis of SAT scores. Total scores for the three parts of the test are approximately
normally distributed with mean 1500 and standard deviation 250. If they want
only the top 5% to qualify, what total SAT score must they equal or exceed? SAT
scores are reported in multiples of 10. correct answer 1920
The z-score with 95% of area under the curve to its left is 1.645. SAT = 1.645*250
+ 1500 = 1911.25, so they must score at least 1920 in multiples of 10.
A woman is told her weight has a standard score (z-score) of -1.5. This means that
correct answer her weight is 1.5 standard deviations below average
According to the 68-95-99.7 Rule, approximately 99.7% of the area in any Normal
distribution is within 3 standard deviations of the mean μ. The actual number z of
standard deviations for 99.7% of all observations to be within z σ of μ is _______.
correct answer 2.97
If 99.7% is in the center of the distribution, there is 0.0015 (0.15%) in either tail.
Read the Standard Normal table to find that z = 2.97.
An instructor asked students to name their favorite color. An appropriate graph to
display the data is a correct answer pie chart
Questions With Accurate Answers
___________% of the data are less than the median. correct answer 50%
2) ____% of the data are less than the median. correct answer 50%
3. The distribution of bladder volume in men is approximately Normal with mean
550 ml and standard deviation 100 ml. What percent of men have a bladder
volume smaller than 450 ml? Round you answer to the nearest whole number.
correct answer (16 and) 450 ml is one standard deviation below the mean. We
expect about 68% of all men to have bladder volumes within one standard
deviation of 550. The remaining 32% is split in half because of symmetry.
A good use of z-scores is to compare values in two different distributions.
Suppose your instructor will drop the low test when computing final grades, but
he curves grades on each test. You had a 92 on the first test, and an 85 on the
second. The first test had a mean of 83 and standard deviation of 6. The second
test had a mean of 75 and standard deviation 3. The test with the relatively better
score is ____________. correct answer Test 2
Compute a z-score for each test. The first is (92 - 83)/6 = 1.5. The second is (85 -
75)/3 = 3.333.
A good use of z-scores is to compare values in two different distributions.
Suppose your instructor will drop the low test when computing final grades, but
he curves grades on each test. You had a 92 on the first test, and an 85 on the
second. The first test had a mean of 83 and standard deviation of 6. The second
,test had a mean of 75 and standard deviation 3. The z-score for your second test
is ______. Round your answer to two decimal places. correct answer 3.33
The z-score is (85 - 75)/3 = 3.33.
A good use of z-scores is to compare values in two different distributions.
Suppose your instructor will drop the low test when computing final grades, but
he curves grades on each test. You had a 92 on the first test, and an 85 on the
second. The first test had a mean of 83 and standard deviation of 6. The second
test had a mean of 75 and standard deviation 3. The z-score for your second test
is ______. Round your answer to two decimal places. correct answer The z-score
is (85 - 75)/3 = 3.33.
A shopper at a local supermarket spent the following amounts in her last eight
trips to the store: $32.92 $14.14 $30.80 $28.34 $75.58 $36.33 $33.51 $22.94 The
amount spent of _________ is most likely an outlier. Give answer as $XX.XX.
correct answer The amount spent of $75.58 is considerably more than any of the
other amounts.
A shopper at a local supermarket spent the following amounts in his last eight
trips to the store: $32.92 $14.14 $30.80 $27.34 $28.34 $75.58 $27.42 $22.94 The
value of the median is _________________. Give answer as $XX.XX. correct
answer $27.88
A shopper at a local supermarket spent the following amounts in his last eight
trips to the store: $32.92 $14.14 $30.80 $28.34 $75.58 $36.33 $33.51 $22.94 The
mean of these data is $34.32. If the amount of $75.58 were a typo and should be
$25.58, what would happen to the mean? correct answer The mean would
decrease. Since $25.58 would be added instead of $75.58, the sum would be
smaller and the mean would be smaller.
, A survey of college students collected information on several variables: Distance
from Home, Age, Major, Gender, and Class. The variable Class is correct answer
categorical.
A university wants to select individuals for their honors program partly on the
basis of SAT scores. Total scores for the three parts of the test are approximately
normally distributed with mean 1500 and standard deviation 250. If they want
only the top 5% to qualify, what total SAT score must they equal or exceed? SAT
scores are reported in multiples of 10. correct answer 1920
The z-score with 95% of area under the curve to its left is 1.645. SAT = 1.645*250
+ 1500 = 1911.25, so they must score at least 1920 in multiples of 10.
A woman is told her weight has a standard score (z-score) of -1.5. This means that
correct answer her weight is 1.5 standard deviations below average
According to the 68-95-99.7 Rule, approximately 99.7% of the area in any Normal
distribution is within 3 standard deviations of the mean μ. The actual number z of
standard deviations for 99.7% of all observations to be within z σ of μ is _______.
correct answer 2.97
If 99.7% is in the center of the distribution, there is 0.0015 (0.15%) in either tail.
Read the Standard Normal table to find that z = 2.97.
An instructor asked students to name their favorite color. An appropriate graph to
display the data is a correct answer pie chart
