Question 1

Suppose for every email message that you receive in the next week, you keep track of
- Whether the message is spam
- Whether the sender is a family member, a friend, or someone else
- Whether the message contains an emoticon (such as a smiley face )
- How many words are in the message
- What day of the week the message was sent
-Which of these variables is quantitative?

Accepted Answer

The quantitative variable is how many words are in the message.

Question 2

Suppose for every email message that you receive in the next week, you keep track of
- Whether the message is spam
- Whether the sender is a family member, a friend, or someone else
- Whether the message contains an emoticon (such as a smiley face )
- How many words are in the message
- What day of the week the message was sent
-How many of these variables are categorical? How many are binary?

Accepted Answer

Four of these five variables are categorical; two (the ones about spam, emoticon) are binary.

Question 3

Suppose for every email message that you receive in the next week, you keep track of
- Whether the message is spam
- Whether the sender is a family member, a friend, or someone else
- Whether the message contains an emoticon (such as a smiley face )
- How many words are in the message
- What day of the week the message was sent
-What are the observational units in this study?

Accepted Answer

The observational units are the email messages that you receive next week.

Question 4

Suppose for every email message that you receive in the next week, you keep track of
- Whether the message is spam
- Whether the sender is a family member, a friend, or someone else
- Whether the message contains an emoticon (such as a smiley face )
- How many words are in the message
- What day of the week the message was sent
-State a research question that you could address with these data.

Accepted Answer

The answer of Suppose for every email message that you...

Question 5

Suppose for every email message that you receive in the next week, you keep track of
- Whether the message is spam
- Whether the sender is a family member, a friend, or someone else
- Whether the message contains an emoticon (such as a smiley face )
- How many words are in the message
- What day of the week the message was sent
-Is people who send you a message with an emoticon a legitimate variable in this study? Explain why or why not.

Accepted Answer

The answer of Suppose for every email message that you...

Question 6

In a study reported in the July 6, 2007, issue of the journal Science, researchers studied 396 American college students and kept track of each student's gender and also how many words they spoke in a day. They found that women spoke an average of 16,215 words per day and men an average of 15,669 words per day.
-Identify the observational units in this study.

Accepted Answer