mean, median, mode, trimean, geometric mean,

range, interquartile range, variance, standard deviation

1. The following questions are from the ADHD Treatment (AT) case study.
2. (AT#4) What is the mean number of correct responses of the participants after taking the placebo (0 mg/kg)? (relevant section)
3. (AT#7) What are the standard deviation and the interquartile range of the d0 condition? (relevant section)

Twenty-five randomly selected students were asked the number of movies they watched the previous week. The results are as follows:

80. If the data were collected by asking the first 111 people who entered the store, then the type of sampling is:

a. cluster

b. simple random

c. stratified

d. convenience

84. Given the following box plot:

Figure 2.41

a. which quarter has the smallest spread of data? What is that spread?

b. which quarter has the largest spread of data? What is that spread?

c. find the interquartile range (IQR).

d. are there more data in the interval 5–10 or in the interval 10–13? How do you know this?

e. which interval has the fewest data in it? How do you know this?

i. 0–2

ii. 2–4

iii. 10–12

iv. 12–13

v. need more information

In complete sentences, explain why each statement is false.

i. Data 1 has more data values above two than Data 2 has above two.

ii. The data sets cannot have the same mode.

iii. For Data 1, there are more data values below four than there are above fouR