Statistics Final Exam.docx ) (Solved Questions 100% VERIFIED QUESTIONS AND ANSWERS)
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Statistics Final Exam
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Statistics Final Exam
Statistics Final Exam
A large state university conducted a survey among their students and received 400 responses. The survey asked the students to provide the following information:
*Age
*Year in School (Freshman, Sophomore, Junior, Senior)
*Major
What type of graph would you use to descr...
A large state university conducted a survey among their students and received 400 responses. The
survey asked the students to provide the following information:
*Age
*Year in School (Freshman, Sophomore, Junior, Senior)
*Major
What type of graph would you use to describe the variable Major?>>> A bar chart because Major is a
categorical variable.
Parking at a university has become a problem. University administrators are interested in determining
the average time it takes a student to find a parking spot. An administrator inconspicuously followed
180 students and recorded how long it took each of them to find a parking spot. Which of the following
types of graphs should NOT be used to display information concerning the students parking times?>>>
pie chart
A large state university conducted a survey among their students and received 300 responses. The
survey asked the students to provide the following information:* Age* Year in School (Freshman,
Sophomore, Junior, Senior)* Gender* GPA>>> A histogram because Age is a numerical variable.
The two histograms below display the exact same data. How do the plots differ?>>> Histogram (i) uses
relative frequencies to show the proportion of observations at a given value. Histogram (ii) uses
frequencies to simply count the number of observations at a given value.
In a survey, high school graduates were asked "Did you play sports in high school?" The response was
electronically recorded as a "1" for yes and a "0" for no. This is an example of .>>> coded categorical
data
In a survey, married couples were asked, "Do you have children?" The response was electronically
recorded as a "1" for yes and a "0" for no. This is an example of .>>> Coded categorical data
In a study of 900 adults, 45 out of the 325 men in the study said that they preferred to rent a movie on
DVD rather than going out to a movie theater.What is the approximate percentage of men in this study
who prefer to rent a movie on DVD?>>> 13.8%
In a study of 1350 elementary school children, 118 out of the 615 girls in the study said they want to be
a teacher when they grow up.What percent of girls want to be a teacher when they grow up?>>> 19.2%
,The histogram below shows the distribution of pass rates on a swimming test taken by all children who
completed a four week summer swim course at the local YMCA. What is the typical pass rate for the
swim test?>>> about 75%
Marital status of each member of a randomly selected group of adults is an example of what type of
variable?>>> categorical variable
The number of parents who attended parent teacher conferences at a local elementary school is an
example of what type of variable?>>> numerical variable
A group of 500 patients who suffer from hypothyroidism, a condition in which your thyroid does not
produce enough of certain hormones, were asked to participate in a study to determine the
effectiveness of a new medication. The patients were randomly divided into two groups, one that was
given the actual medication, and one that received a placebo pill. The results of the study are below.
Was the new medication effective in treating hypothyroidism?>>> Yes, a higher percent of patients who
took the medication had improved symptoms than the patients who took the placebo.
Which of the following would likely show a bimodal distribution in a histogram?>>> The heights of all
students in a high school band.
A doctor is interested in determining whether a certain medication increases the risk of high blood
pressure. He reviews his patients' medical records and finds that a higher proportion of people who take
the medication are suffering from high blood pressure.>>> observational study
A group of students is divided into two groups. One group is a given a new chewable vitamin and the
other group is given a placebo. After six months they are asked to fill out a questionnaire and given a
health exam to see whether the new vitamin has health benefits that are better than a placebo.>>>
controlled experiment
A group of students is divided into two groups. One group listens to classical music while taking a math
test and the other group takes the test in silence. The average test scores of the two groups are
compared to see whether listening to music during a math test has an effect on scores.>>> Controlled
experiment
A group of cancer patients is divided into two groups. One group is given a new drug to fight the side
effects of chemotherapy and the other group is given a placebo. After three months they are asked to
respond to a questionnaire about the frequency and severity of their side effects to see whether the
new drug improved the overall negative side effects of chemotherapy.>>> Controlled experiment
The table gives the GPA and gender of students in a business class.Is the format of the data set stacked
or unstacked?>>> stacked
, The table gives the GPA of some students in two math classes. One class meets in the morning and one
in the afternoon.
Is the format of the data set stacked or unstacked?>>> unstacked
A two-way table could be used for which of the following pairs of variables?>>> gender and favorite
class
A word cloud was created using the first chapter of John Green's The Fault in Our Stars. (Note that filler
words such as "the," "a/an," and "and" were excluded from the plot.)
What information is NOT explicitly portrayed in the word cloud?>>> The number of times each word
occurs.
Consider the following statement, "In a nationwide study, children on an all-organic diet are more alert
in school than those not on an all-organic diet." Which of the following is a plausible confounding
variable in this study?>>> School start times
The quality of the non-organic diet
Parents' social-economic status
Determine which of the following five variables are numerical and which are categorical.
age, gender, weight, ethnicity, favorite math class>>> Age and weight are numerical variables. Gender,
ethnicity, and favorite math class are categorical variables.
In a sample of 775 senior citizens, approximately 67% said that they had seen a television commercial
for life insurance. About how many senior citizens is this?>>> 519
Data was collected on hand grip strength of adults. The histogram below summarizes the data. Which
statement is true about the distribution of the data shown in the graph?>>> The graph shows evidence
that two different groups may have been combined into one collection.
A gym is offering a new 6-week diet plan for its members. Members who sign up for the program are
weighed and measured once a week for the duration of the program. The owners of the gym want to
know if the diet plan actually helps people lose weight. What variable could be a possible confounding
factor in determining the cause of weight loss?>>> the persons exercise routine
Each day for twenty days a record store owner counts the number of customers who purchase an album
by a certain artist. The data and a dotplot of the data are shown below:
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