AP Stat Exam Quiz with Correct Answers.
The lengths of individual shellfish in a population of 10,000 shellfish are approx. normally
distributed with mean 10 centimeters and standard deviation 0.2 centimeters. Which of the
following is the shortest interval that contains approx. 4,000 shellfish lengths? - Correct
Answer 9.895 cm to 10.105 cm
At a college the scores on the chemistry final exam are approx normally distributed, with a
mean of 75 and a standard deviation of 12. The scores on the calc final are also approx
normally distributed with a mean of 80 and a standard deviation of 8. A student scored 81
on the chem final and 84 on the calc final. Relative to the students in each class, in which
subject did this student do better> - Correct Answer The student did equally well in each
course
A high school statistics class wants to conduct a survey to determine what percentage of
students in the school would be willing to pay a fee for participating in after-school
activities. Twenty students are randomly selected from each of the freshman, sophomore,
junior, and senior classes to complete the survey. This plan is an example of which type of
sampling? - Correct Answer Stratified random
One hundred people were interviewed and classified according to their attitude toward
small cars and their personality type. Which of the following is true? - Correct Answer Of
the three attitude groups, the group with the neutral attitude has the highest proportion of
type B personality types.
Which of the following statements is true for two events, each with a probability greater
than 0? - Correct Answer If the events are mutually exclusive, they cannot be independent.
To check the effect of cold temp. on the elasticity of two brands of rubber bands, one box of
Brand A and one box of Brand B rubber bands are tested. Ten bands from the Brand A box
are placed in a freezer for two hours and ten bands from the Brand B box are kept at room
temp. The amount of stretch before breakage is measured on each rubber band, and the
mean of the cold bands is compared to the mean for the others. Is this a good experimental
design? - Correct Answer No, because temperature is confounded by brand
Which of the following is a key distinction between well designed experiments and
observational studies? - Correct Answer An experiment can show a direct cause and effect
relationship, wheras an observational study cannot.
, The equation of the least squares regression line for the points on the scatterplot above is
y= 1.3 + 0.73x. What is the residual plot (4,7)? - Correct Answer 2.78
The heights of adult women are approx normally distributed about a mean of 65 inches
with a SD of 2 in. If Rachel is the 99th percentile in height for adult women, then her height
in inches is closet to? - Correct Answer 70
A researcher wishes to test a new drug developed to treat hypertension (high blood
pressure). A group of 40 hypertensive men and 60 hypertensive women is to be used. The
experimenter randomly assigns 20 of the men and 30 of the women to the placebo and
assigns the rest to the treatment. The major reason for separate assignment for men and
women is that? - Correct Answer The new drug affect men and women differently
Suppose that 2% of a clinic's patients are known to have cancer. A blood test is developed
that is positive in 98% of patients with cancer but is also positive in 3% of patients who do
not have cancer. If a person who is chosen at random from the clinic's patients is given the
test and it comes out positive, what is the probability that the person actually has cancer? -
Correct Answer .4
A candy company produces individually wrapped candies. The quality control manager for
the company believes that the weight of the candies is approximately normally distributed
with the mean 720 milligrams (mg). If the manager's belief is correct, which of the following
intervals of weights will contain the largest proportion of the candies in the distribution of
weights? - Correct Answer 700 mg to 740 mg
A random sample of 25 households from the Mountainview school district was surveyed. In
this survey, data were collected on the age of the youngest child living in each household.
The histogram below displays the data collected in the survey. In which of the following
intervals is the median of these data located? - Correct Answer 8 years old to less than 10
years old
The distribution of heights of 6 year old girls is approximately normally distributed what's
the mean of 46.0 inches And a standard deviation of 2.7 inches. Aliyaah is 6 years old, and
her height is 0.96 standard deviation above the mean. Her friend Jayne is also 6 years old
and is the 93rd percentile of the height distribution. At what percentile is Aliyaah's height,
and how does her height compared to Jayne's height? - Correct Answer Aliyaah's height is
at the 83rd percentile of the distribution, and she is shorter than Jayne.
Lauren is enrolled in a very large College Calculus class. On the first exam, the class mean
was 75 in the standard deviation was 10. On the second exam, the class mean was 70 and
The lengths of individual shellfish in a population of 10,000 shellfish are approx. normally
distributed with mean 10 centimeters and standard deviation 0.2 centimeters. Which of the
following is the shortest interval that contains approx. 4,000 shellfish lengths? - Correct
Answer 9.895 cm to 10.105 cm
At a college the scores on the chemistry final exam are approx normally distributed, with a
mean of 75 and a standard deviation of 12. The scores on the calc final are also approx
normally distributed with a mean of 80 and a standard deviation of 8. A student scored 81
on the chem final and 84 on the calc final. Relative to the students in each class, in which
subject did this student do better> - Correct Answer The student did equally well in each
course
A high school statistics class wants to conduct a survey to determine what percentage of
students in the school would be willing to pay a fee for participating in after-school
activities. Twenty students are randomly selected from each of the freshman, sophomore,
junior, and senior classes to complete the survey. This plan is an example of which type of
sampling? - Correct Answer Stratified random
One hundred people were interviewed and classified according to their attitude toward
small cars and their personality type. Which of the following is true? - Correct Answer Of
the three attitude groups, the group with the neutral attitude has the highest proportion of
type B personality types.
Which of the following statements is true for two events, each with a probability greater
than 0? - Correct Answer If the events are mutually exclusive, they cannot be independent.
To check the effect of cold temp. on the elasticity of two brands of rubber bands, one box of
Brand A and one box of Brand B rubber bands are tested. Ten bands from the Brand A box
are placed in a freezer for two hours and ten bands from the Brand B box are kept at room
temp. The amount of stretch before breakage is measured on each rubber band, and the
mean of the cold bands is compared to the mean for the others. Is this a good experimental
design? - Correct Answer No, because temperature is confounded by brand
Which of the following is a key distinction between well designed experiments and
observational studies? - Correct Answer An experiment can show a direct cause and effect
relationship, wheras an observational study cannot.
, The equation of the least squares regression line for the points on the scatterplot above is
y= 1.3 + 0.73x. What is the residual plot (4,7)? - Correct Answer 2.78
The heights of adult women are approx normally distributed about a mean of 65 inches
with a SD of 2 in. If Rachel is the 99th percentile in height for adult women, then her height
in inches is closet to? - Correct Answer 70
A researcher wishes to test a new drug developed to treat hypertension (high blood
pressure). A group of 40 hypertensive men and 60 hypertensive women is to be used. The
experimenter randomly assigns 20 of the men and 30 of the women to the placebo and
assigns the rest to the treatment. The major reason for separate assignment for men and
women is that? - Correct Answer The new drug affect men and women differently
Suppose that 2% of a clinic's patients are known to have cancer. A blood test is developed
that is positive in 98% of patients with cancer but is also positive in 3% of patients who do
not have cancer. If a person who is chosen at random from the clinic's patients is given the
test and it comes out positive, what is the probability that the person actually has cancer? -
Correct Answer .4
A candy company produces individually wrapped candies. The quality control manager for
the company believes that the weight of the candies is approximately normally distributed
with the mean 720 milligrams (mg). If the manager's belief is correct, which of the following
intervals of weights will contain the largest proportion of the candies in the distribution of
weights? - Correct Answer 700 mg to 740 mg
A random sample of 25 households from the Mountainview school district was surveyed. In
this survey, data were collected on the age of the youngest child living in each household.
The histogram below displays the data collected in the survey. In which of the following
intervals is the median of these data located? - Correct Answer 8 years old to less than 10
years old
The distribution of heights of 6 year old girls is approximately normally distributed what's
the mean of 46.0 inches And a standard deviation of 2.7 inches. Aliyaah is 6 years old, and
her height is 0.96 standard deviation above the mean. Her friend Jayne is also 6 years old
and is the 93rd percentile of the height distribution. At what percentile is Aliyaah's height,
and how does her height compared to Jayne's height? - Correct Answer Aliyaah's height is
at the 83rd percentile of the distribution, and she is shorter than Jayne.
Lauren is enrolled in a very large College Calculus class. On the first exam, the class mean
was 75 in the standard deviation was 10. On the second exam, the class mean was 70 and
