STRAIGHTERLINE STATISTICS FINAL
EXAM CORRECT 100%
anais is organizing her rock collection and places each rock in one of three categories:
small, medium, or large. this illustrates what level of measurement? - ANSWER ordinal
which of the following is an example of a nominal variable? - ANSWER gender
what sort of data are temperature measurements? - ANSWER ratio
based on the graph, which statement best describes the relationship between daily high
temperatures and the number of people going to the beach? - ANSWER it is negative
linear relationship
the table shows the number of train tickets carl purchased to each station over the last
month and the fare to each station. what was the average cost per ride? - ANSWER
$5.45
the outcomes observes in an experiment are: 2, 8, 3, 10, 4, and 9. what is the sample
variance? - ANSWER 11.6
jason collects information about annual family income from each student at his college.
he computes both the mean and median family income across all students and is
surprised to find that the mean income is higher than the median income. what is the
most likely reason for the difference in the mean and the median? - ANSWER the
mean is more affected by a small number of extreme values
an instructor administers a test to a class of 30 students and observes that the scores
are close to normally distributed with a mean score of 40 and a standard deviation of
10. what can you conclude from these results? - ANSWER the average student scored
at the 40th percentile
laura's quiz scores during the semester were 87, 82, 90, 92, and 84. what was her
mean score - ANSWER 87
the table lists the populations and relative frequencies of car ownership in 4 neighboring
cities. which city has the most cars? - ANSWER westville
in the figure shown, sample a and sample b have the same - ANSWER median
the contingency table describes the living arrangements of students at a small college.
what percentage of the students are women who live in off-campus housing? -
ANSWER 54
, which of these correlation coefficients shows the strongest linear relationship between 2
variables - ANSWER -0.31
what conclusion can be drawn from the graph of average daily temperature and hot
beverage sales - ANSWER there is a negative correlation between average daily
temperature and hot beverage sales
the coefficient of correlation r is a measurement of statistical relationships that are -
ANSWER linear
a bag contains marbles of different colors (red, yellow, and blue) and different sizes
(small and large). the probability of picking a blue marble out of the bag is 0.10 and the
probability of picking a large marble is 0.50. what is the probability of picking a large
blue marble - ANSWER 0.05
a swimmer, sarah, hopes to compete in an upcoming meet. there are 8 team members
eligible for the breaststroke event at the meet, but only 1 team member will be randomly
selected to compete in that event. there are 4 team members eligible for the butterfly
event at the meet, but only 1 team member will be randomly selected to compete in that
event. sarah is eligible to compete in both events. what is her chance of being selected
for at least one of the two events - ANSWER 3 in 8
The graduating class of a small college has 170 men and 195 women. If grades and
gender are independent, what is the probability that students with the two highest grade
averages will be both women? - ANSWER 0.28
A high school student applies to both the naval Academy and West Point. The diagram
shows his chances of being accepted to each school and the chance that he will be
accepted to both. What is the probability that he will be accepted to at least one of the
two schools? - ANSWER 16%
Which type of data would have a discrete probability distribution? - ANSWER Number
of children per household in a census
Withdrawn from a normal distribution, 95% of the sample means will fall within how
many standard deviations of the population - ANSWER 1.96
A maple syrup manufacturer asked 100 customers to rate its brand of maple syrup on a
scale of one to 10. The mean rating was seven, with a sample standard deviation of 1.5.
Based on this sample, what is the 95% confidence interval for the estimate of the
population mean? - ANSWER (6.7, 7.3)
A regression analysis suggest that the number of children and employee has predicts
the number of personal days he/she will take off work. The life of the regression line is
3.2 and the lower bound of the confidence interval for this slope is 0.8. What is the
upper bound? - ANSWER 5.6
EXAM CORRECT 100%
anais is organizing her rock collection and places each rock in one of three categories:
small, medium, or large. this illustrates what level of measurement? - ANSWER ordinal
which of the following is an example of a nominal variable? - ANSWER gender
what sort of data are temperature measurements? - ANSWER ratio
based on the graph, which statement best describes the relationship between daily high
temperatures and the number of people going to the beach? - ANSWER it is negative
linear relationship
the table shows the number of train tickets carl purchased to each station over the last
month and the fare to each station. what was the average cost per ride? - ANSWER
$5.45
the outcomes observes in an experiment are: 2, 8, 3, 10, 4, and 9. what is the sample
variance? - ANSWER 11.6
jason collects information about annual family income from each student at his college.
he computes both the mean and median family income across all students and is
surprised to find that the mean income is higher than the median income. what is the
most likely reason for the difference in the mean and the median? - ANSWER the
mean is more affected by a small number of extreme values
an instructor administers a test to a class of 30 students and observes that the scores
are close to normally distributed with a mean score of 40 and a standard deviation of
10. what can you conclude from these results? - ANSWER the average student scored
at the 40th percentile
laura's quiz scores during the semester were 87, 82, 90, 92, and 84. what was her
mean score - ANSWER 87
the table lists the populations and relative frequencies of car ownership in 4 neighboring
cities. which city has the most cars? - ANSWER westville
in the figure shown, sample a and sample b have the same - ANSWER median
the contingency table describes the living arrangements of students at a small college.
what percentage of the students are women who live in off-campus housing? -
ANSWER 54
, which of these correlation coefficients shows the strongest linear relationship between 2
variables - ANSWER -0.31
what conclusion can be drawn from the graph of average daily temperature and hot
beverage sales - ANSWER there is a negative correlation between average daily
temperature and hot beverage sales
the coefficient of correlation r is a measurement of statistical relationships that are -
ANSWER linear
a bag contains marbles of different colors (red, yellow, and blue) and different sizes
(small and large). the probability of picking a blue marble out of the bag is 0.10 and the
probability of picking a large marble is 0.50. what is the probability of picking a large
blue marble - ANSWER 0.05
a swimmer, sarah, hopes to compete in an upcoming meet. there are 8 team members
eligible for the breaststroke event at the meet, but only 1 team member will be randomly
selected to compete in that event. there are 4 team members eligible for the butterfly
event at the meet, but only 1 team member will be randomly selected to compete in that
event. sarah is eligible to compete in both events. what is her chance of being selected
for at least one of the two events - ANSWER 3 in 8
The graduating class of a small college has 170 men and 195 women. If grades and
gender are independent, what is the probability that students with the two highest grade
averages will be both women? - ANSWER 0.28
A high school student applies to both the naval Academy and West Point. The diagram
shows his chances of being accepted to each school and the chance that he will be
accepted to both. What is the probability that he will be accepted to at least one of the
two schools? - ANSWER 16%
Which type of data would have a discrete probability distribution? - ANSWER Number
of children per household in a census
Withdrawn from a normal distribution, 95% of the sample means will fall within how
many standard deviations of the population - ANSWER 1.96
A maple syrup manufacturer asked 100 customers to rate its brand of maple syrup on a
scale of one to 10. The mean rating was seven, with a sample standard deviation of 1.5.
Based on this sample, what is the 95% confidence interval for the estimate of the
population mean? - ANSWER (6.7, 7.3)
A regression analysis suggest that the number of children and employee has predicts
the number of personal days he/she will take off work. The life of the regression line is
3.2 and the lower bound of the confidence interval for this slope is 0.8. What is the
upper bound? - ANSWER 5.6
