You recorded the time in seconds it took for 8 participants

to solve a puzzle.

These times appear below. However, when the data was entered

into the

statistical program, the score that was supposed to be 22.1

was entered as 21.2.

You had calculated the following measures of central

tendency: the mean, the

median, and the mean trimmed 25%.

Time (seconds)

15.2

18.8

19.3

19.7

20.2

21.8

22.1

29.4

Which of these measures of central tendency will change when

you correct the recording error?

Question options:

a)

mean

b)

median

c)

mean trimmed to 25%

Question 4 8.75

/ 10 points

Question 4 Text: David Lane Page 161, Problem

8

You know the minimum, the maximum, and the 25th, 50th, and

75th percentiles

of a distribution.

Select from the following list the measures of central

tendency or variability that can be determined?

Question options:

mean

median

mode

trimean

range

interquartile range

variance

standard deviation

Question 5 10

/ 10 points

Question 5 Text: David Lane Page 164, Problem 31

FYI: The link to

the ADHD Treatment (AT) case study can

be found in our textbook Lane, Ch 20 page 660.

What is the mean number of correct responses of the

participants in the ‘AT’ study after taking the placebo (0 mg/kg)?

Data from study (0 mg/kg

57 27 32 31 34 38 71

33 34 53 36 42

26 52 36 55 36 42 36 54 34 29 33 33

Enter answer rounded to 2 decimal places.

Question 6 0

/ 10 points

Question 6 Text: Barbara

Illowsky Page 164,

Problem 32

FYI: The link to the

ADHD Treatment (AT) case study can be found in our Textbook ‘Lane’, Ch 20 page

660.

Methods for calculating the Standard Deviation:

Formula

Scientific calculator (Approximately $18.00)

TI 83 +, TI 84 Graphing Calculator or equivalent

Excel Spreadsheet

Internet Online calculator.

1. What is the

standard deviation of correct responses of the participants after taking the

placebo (0 mg/kg)?

Enter answer

rounded to 2 decimal places.

Data 0 mg/kg)?

57 27 32 31 34 38 71 33 34 53 36 42

26 52 36 55 36 42 36 54 34 29 33 33

2. What is the

interquartile range of correct responses of the participants after taking the

placebo (0 mg/kg)?

Enter answer rounded to 1 decimal place.

Question 7 10

/ 10 points

Question 7 Text: Barbara

Illowsky Page 137,

Problem 78

Twenty-five randomly selected students were asked the number

of movies they watched the previous week. The results are as follows

No. of Movies

Frequency

Relative Frequency

Cumulative Relative Frequency

0

5

1

9

2

6

3

4

4

1

Table 2.67

Complete the columns in the above table and answer the

following questions.

Enter each answer rounded to 2 decimal places.

1. What is the

relative frequency for the students that watched 3 movies in the previous week?

2. What is the

cumulative relative frequency for the students that watched 3 movies in the

previous week?

Question 8 10

/ 10 points

Question 8 Text: Barbara

Illowsky

Page 138, Problem 80

If the data were collected by asking the first 111 people

who entered the store, then the type of sampling is:

Enter answer by keying in the correct letter.

a. cluster

b. simple random

c. stratified

d. convenience

Question 9 3

/ 10 points

Question 9 Text: Barbara

Illowsky Page 139,

Problem 84

Given the following box plot (See Figure 2.41 on page 139 in

Textbook)

1. Which quarter has

the smallest spread of data?

a. Q1 b.

Q2 c. Q3

d. Q4

Enter answer with the letter associated with the correct

answer.

Do not include the decimal point.

2. What is its

spread?

Enter answer rounded to 1 decimal place.

3. Which quarter has

the largest spread of data?

a. Q1 b.

Q2 c. Q3

d. Q4

Enter answer with the letter associated with the correct

answer.

Do not include the decimal point.

4. What is that

spread?

Enter answer rounded to 1 decimal place.

5. What is the

interquartile range (IQR).

Enter answer rounded to 1 decimal place.

6. Are there more

data in the interval 5–10 or in the interval 10–13?

a. 5–10 b. 0–13

Enter answer with the letter associated with the correct

answer.

Do not include the decimal point.

7. Which interval

has the fewest amount of data in it?

a. 0 – 2 b. 2 – 4 c. 10 –1 2 d.

12 – 13 e.

Need more information

Enter answer with the letter associated with the correct

answer.

Do not include the decimal point.

Question 10 10

/ 10 points

Question 10 Text: Barbara

Illowsky Page 141, Problem 88

Given the Box and Whisker plots on page 141 in the Illowsky

Textbook, figure 2.45

For which group, Data 1 or Data 2, is the value 7 more

likely to be an outlier?

Question options:

The value seven (7) more likely to be an outlier in Data set

1.

The value seven (7) is

more likely to be an outlier in Data set 2.