Question

Patients who undergo chronic hemodialysis often experience severe anxiety. The accompanying data give score results from a psychiatric questionnaire for patients that viewed relaxation​ videotapes, where higher scores correspond to higher anxiety. Use limit grouping with a first class of 13-19 and a class width of 7 to complete parts​ (a) through​ (d).

The data is:
45
36
24
16
23
38
54
39
46
57
14
32
71
50
48
16
51
26
40
46
20
20
57
40
15
44
18
36
28
35
57
a. Determine a frequency distribution up to 9 classes.
​(Type integers or decimals. Do not​ round.)

Answer 1

Explanation:

To create a frequency distribution with a first class of 13-19 and a class width of 7, we need to determine the boundaries for each class. The first class has a lower boundary of 13 and an upper boundary of 19. The upper boundary of each subsequent class is obtained by adding 7 to the previous upper boundary.

Using these boundaries, we can count how many values fall into each class:

Class Boundaries Tally Frequency

1 13-19

2 20-26

3 27-33

4 34-40

5 41-47

6 48-54

7 55-61

8 62-68

9 69-75

To obtain the frequency, we count the number of values that fall into each class. The tally column is used to keep track of the values as they are counted.