Question

If I create a frequency table summarizing anxiety scores that range from 0 to 100, what is the best number of "bins" to use in the table?

Group of answer choices

a)10

b.)100

c)20

d)4

After taking a defensive driving course, most student drivers did very well on the driver's license exam by passing the test with 75% or higher. How would you describe the distribution of the exam scores?

Group of answer choices

a)The distribution is left skewed.

b)The distribution has a floor effect.

c)The distribution is symmetrical.

d)The distribution has a highly positive kurtosis.

A researcher observed the level of aggression of ten 5-year-old boys over the course of a school day. The numbers of aggressive incidents for the boys were 2, 6, 0, 2, 3, 1, 5, 1, 1, 0. What was the mean number of aggressive acts for this group of children?

Group of answer choices

a)2.1

b)2.5

c)0

d)1.8

When would you choose a frequency table over a histogram for summarizing data?

Group of answer choices

a)Data on gender

b)Data on weight in pounds

c)Data with a sample size of over 100

d)Data that are highly skewed

The most recent assignment in the PSY230 class has a mean of 40 points and a standard deviation of 10 points. John earned 41 points while Tom earned 45 points. How many standard deviations separate the two students' scores?

Group of answer choices

a).4

b)1.4

c)4.0

d)It cannot be calculated based on the given information.

Question 8

The standard deviation of a group of scores is 6. What is the variance of that group?

Group of answer choices

a)36

b)12

c)16

d)It cannot be determined.

Question 9

Which of the following is an example of a continuous (equal-interval) variable?

a)Hours spent on exercise

b)Rank order of clothing sizes (small, medium, large)

c)Political party registration

d)Level of college (freshmen, sophomore, junior, senior)

Flag this Question

Question 102 pts

Place the steps for computing variance into the correct order (not all steps will be used):

1) Compute the mean of the sample.
2) Sum the squared deviation scores.
3) Subtract the mean from each score.
4) Square each of the deviation scores.
5) Divide the sum of squared deviations by the number of scores.
6) Square each of the raw scores.
7) Calculate the square root of the sum of squared deviations divided by the number of scores.

Group of answer choices

1, 3, 4, 2, 5

5, 2, 6, 1, 4

3, 2, 5, 4, 1, 6

1, 3, 4, 2, 5, 7

Answer 1

If I create a frequency table summarizing anxiety scores that range from 0 to 100, what is the best number of "bins" to use in the table?

a) 10

After taking a defensive driving course, most student drivers did very well on the driver's license exam by passing the test with 75% or higher. How would you describe the distribution of the exam scores?

d) he distribution has a highly positive kurtosis.

A researcher observed the level of aggression of ten 5-year-old boys over the course of a school day. The numbers of aggressive incidents for the boys were 2, 6, 0, 2, 3, 1, 5, 1, 1, 0. What was the mean number of aggressive acts for this group of children?

a) 2.1

When would you choose a frequency table over a histogram for summarizing data?

c) Data with a sample size of over 100

The most recent assignment in the PSY230 class has a mean of 40 points and a standard deviation of 10 points. John earned 41 points while Tom earned 45 points. How many standard deviations separate the two students' scores?

d) It cannot be calculated based on the given information.

The standard deviation of a group of scores is 6. What is the variance of that group?

a) 36.

Which of the following is an example of a continuous (equal-interval) variable?

c)Political party registration

Place the steps for computing variance into the correct order (not all steps will be used):

1) Compute the mean of the sample.

3) Subtract the mean from each score.

4) Square each of the deviation scores.

2) Sum the squared deviation scores.

5) Divide the sum of squared deviations by the number of scores.

Calculate the square root of the sum of squared deviations divided by the number of scores.

1.414

0.829

1.59

1.973