Question

The accompanying data shows the weekly purchases of printers at a particular electronic store. Using α = ​0.05, perform a​ chi-square test to determine if the number of printers sold per week follows a normal probability distribution. Note that x = 11.3 and s = 4.6.

observed weekly purchases of printers
8
15
12
18
11
15
5
8
2
2
16
7
17
16
11
12
16
13
13
5
11
9
11
8
16
8
8
17
6
20
12
3
9
11
7
14
11
13
14
11
11
6
18
20

Use the intervals below to calculate the​ chi-square test​ statistic, χ2

Interval​ 1:			z	≤	−1.0
Interval​ 2:	−1.0	<	z	≤	0
Interval​ 3:	0	<	z	≤	1.0
Interval​ 4:	1.0	<	z

Calculate the test statistic

χ2 =

​(Round to two decimal places as​ needed.)

Determine the​ p-value.

​p-value =

​(Round to three decimal places as​ needed.)

Answer 1