Question 1

Do you think social media use is independent of age? Give statistical evidence to support
your conclusion.

Accepted Answer

The answer of Do you think social media use is...

Question 2

Find each percent.
a) What percent of adults surveyed are social media users aged 30-49?
b) What percent of the social media users are aged 30-49?
c) What percent of adults aged 30-49 are social media users?

Accepted Answer

The answer of Find each percent.
a) What percent of adults...

Question 3

The students in a biology class kept a record of the height (in centimeters) of plants for a
class experiment. $$\begin{array} { | l | l | l | l | l | } 
\hline 49 & 67 & 38 & 55 & 62 \
\hline 54 & 36 & 41 & 56 & 43 \
\hline 48 & 75 & 44 & 60 & 48 \
\hline 52 & 48 & 53 & 59 & 32 \
\hline
\end{array}$$ 
a. Sketch a histogram for these data.
b. Find the mean and standard deviation of the plant heights.
c. Is it appropriate to use the mean and standard deviation to summarize these data?
Explain.
d. Describe the association of plant heights.

Accepted Answer

The answer of The students in a biology class kept...

Question 4

Identify the variables and tell whether each is categorical or quantitative.

Accepted Answer

The answer of Identify the variables and tell whether each...

Question 5

Find each percent.
a) What percent of the students are girls who ride the bus?
b) What percent of the girls ride the bus?
c) What percent of the bus riders are girls?

Accepted Answer

The answer of Find each percent.
a) What percent of the...

Question 6

What is the marginal distribution of gender?

Accepted Answer

The answer of What is the marginal distribution of gender?...

Question 7

Do you think mode of transportation is independent of gender? Give statistical evidence to
support your conclusion.

Accepted Answer

The answer of Do you think mode of transportation is...

Question 8

Write a sentence or two about the conditional relative frequency distribution of the breeds
among female respondents.

Accepted Answer

The answer of Write a sentence or two about the...

Question 9

Which of the W's are unknown for these data?

Accepted Answer

The answer of Which of the W's are unknown for...

Question 10

Write a sentence or two about the conditional relative frequency distribution of modes of
transportation for the boys.

Accepted Answer

The answer of Write a sentence or two about the...

Question 11

Do you think the breed selection is independent of gender? Give statistical evidence to
support your conclusion.

Accepted Answer

The answer of Do you think the breed selection is...

Question 12

a. Sketch a histogram of these data
b. Find the mean and standard deviation for the number of credit hours.
c. Find the median and IQR for the number of credit hours.
d. Is it more appropriate to use the mean and standard deviation or the median and IQR to
summarize theses data? Explain.

Accepted Answer

The answer of a. Sketch a histogram of these data
b....

Question 13

Find each percent.
a. What percent of the responses were from males who favor Labradors?
b. What percent of the male responses favor Labradors?
c. What percent of the people who choose Labradors were males?

Accepted Answer

The answer of Find each percent.
a. What percent of the...

Question 14

Write a sentence or two about the conditional relative frequency distribution of ages of
social media users.

Accepted Answer

The answer of Write a sentence or two about the...

Question 15

Which of the W's are unknown for these data?

Accepted Answer

The answer of Which of the W's are unknown for...

Question 16

What is the marginal distribution of age groups?

Accepted Answer

The answer of What is the marginal distribution of age...

Question 17

Which of the W's are unknown for these data?

Accepted Answer

The answer of Which of the W's are unknown for...

Question 18

What is the marginal distribution of breeds?

Accepted Answer

The answer of What is the marginal distribution of breeds?...

Question 19

Suppose that the student taking 22 credit hours in the data set was actually taking 28 credit
hours instead of 22 (so we would replace the 22 in the data set with 28). Indicate whether
changing the number of credit hours for that student would make each of the following
summary statistics increase, decrease, or stay about the same:
a. mean
b. median
c. range
d. IQR
e. standard deviation

Accepted Answer

The answer of Suppose that the student taking 22 credit...

Question 20

Identify the variables and tell whether each is categorical or quantitative.

Accepted Answer

The answer of Identify the variables and tell whether each...

Quiz 8: Regression, Associations, and Predictive Modeling

Do you think social media use is independent of age? Give statistical evidence to support your conclusion.

Find each percent. a) What percent of adults surveyed are social media users aged 30-49? b) What percent of the social media users are aged 30-49? c) What percent of adults aged 30-49 are social media users?

Identify the variables and tell whether each is categorical or quantitative.

Find each percent. a) What percent of the students are girls who ride the bus? b) What percent of the girls ride the bus? c) What percent of the bus riders are girls?

What is the marginal distribution of gender?

Do you think mode of transportation is independent of gender? Give statistical evidence to support your conclusion.

Write a sentence or two about the conditional relative frequency distribution of the breeds among female respondents.

Which of the W's are unknown for these data?

Write a sentence or two about the conditional relative frequency distribution of modes of transportation for the boys.

Do you think the breed selection is independent of gender? Give statistical evidence to support your conclusion.

a. Sketch a histogram of these data b. Find the mean and standard deviation for the number of credit hours. c. Find the median and IQR for the number of credit hours. d. Is it more appropriate to use the mean and standard deviation or the median and IQR to summarize theses data? Explain.

Find each percent. a. What percent of the responses were from males who favor Labradors? b. What percent of the male responses favor Labradors? c. What percent of the people who choose Labradors were males?

Write a sentence or two about the conditional relative frequency distribution of ages of social media users.

Which of the W's are unknown for these data?

What is the marginal distribution of age groups?

Which of the W's are unknown for these data?

What is the marginal distribution of breeds?

Identify the variables and tell whether each is categorical or quantitative.