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# Which of these measures of central tendency will change when you correct the recording error?

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

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

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

Internet Online calculator.

1. What is the
standard deviation of correct responses of the participants after taking the
placebo (0 mg/kg)?

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

a. Q1 b.
Q2 c. Q3
d. Q4

Enter answer with the letter associated with the correct

Do not include the decimal point.

2. What is its

Enter answer rounded to 1 decimal place.

3. Which quarter has

a. Q1 b.
Q2 c. Q3
d. Q4

Enter answer with the letter associated with the correct

Do not include the decimal point.

4. What is that

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

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.

Enter answer with the letter associated with the correct

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.

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