d. Predict the waiting time when there are 18 customers in the store.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Question
i only want part D to be solved
Transcribed Image Text:A critically important aspect of customer service in a supermarket is the waiting time at the checkout (defined as the time the customer enters the line until he or she is served). Data were collected during time periods where there were a constant
number of checkout counters open. The total number of customers in the store and the waiting times (in minutes) were recorded. The results are displayed in the accompanying table. Complete parts (a) through (d).
E Click the icon to view the data table.
.....
a. Construct a scatter diagram. Choose the correct graph below.
OA.
Ов.
OC.
OD.
6-
50-
6-
50
50
50
Customers
Time
Customers
Time
b. Assuming a linear relationship, use the least-squares method to find the regression coefficients b, and b,.
bo
= -0.5514
Data table
b, = 0.1441
(Round to four decimal places as needed.)
Full data set O
Day Customers Time
16 1.43
20 1.68
9 0,95
5 0.96
17 1.57
30 3.57
Day Customers Time
22 2.87
17 1.71
24 2.52
16 2.44
c. Interpret the meaning of the slope, b,, in this problem. Choose the correct answer below.
16
17
2
O A. The approximate number of customers when the waiting time is 0 minutes is b,.
3
4
18
19
20
B. For each increase of one customer in the store, the waiting time is expected to decrease by b, minutes.
5
22 3.17
16 1.97
14 0.76
O C. For each increase of one minute of waiting time, the number of customers in the store is expected to increase by b,.
6
21
26 3.42
11 0.31
10 0.77
7
22
D. For each increase of one customer in the store, the waiting time is expected to increase by b, minutes.
8
9
10
19 1.56
28 3.89
23
24
5
d. Predict the waiting time when there are 18 customers in the store.
11 1.28
20 2.97
34 4.16
23 3.52
8 0.16
17 2.36
25
26
27
28
18 1.54
21 1.88
20 3.07
30 3.76
37 4.11
40 5.68
11
|minutes
12
(Round to two decimal places as needed.)
13
14
29
30
15
Customers
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