Assume that the random variable D follows the Normal distribution. For the sixth and seventh groups, calculate the values of the terms (0, – E,)²

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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Question
2. Assume that the random variable D follows the Normal distribution.
For the sixth and seventh groups, calculate the values of the terms
(0; – E:)²
E;
If you have not calculated the values of the sample mean and stan-
dard deviation, use D
26m and s =
5m.
Transcribed Image Text:2. Assume that the random variable D follows the Normal distribution. For the sixth and seventh groups, calculate the values of the terms (0; – E:)² E; If you have not calculated the values of the sample mean and stan- dard deviation, use D 26m and s = 5m.
Question 2
A manufacturer of Wi-Fi routers is investigating the maximum distance
(measured in meters) at which a signal can be detected at a certain
level for their product. Let D be the random variable of this maximum
distance. A frequency distribution of values of D was produced for a
random sample of 166 routers; it is shown in the table below. Setting
O; as the observed values and E, as the expected values for group i, the
last column shows calculated values of
(0, - E.)²
E;
Li
fi
(0,-E,)?
E
110
115
1
0.077
115
120
4
4.336
120
125
49
6.673
125
130
35
0.784
130
135
15
0.722
135
140
4
?
140
145
1
Transcribed Image Text:Question 2 A manufacturer of Wi-Fi routers is investigating the maximum distance (measured in meters) at which a signal can be detected at a certain level for their product. Let D be the random variable of this maximum distance. A frequency distribution of values of D was produced for a random sample of 166 routers; it is shown in the table below. Setting O; as the observed values and E, as the expected values for group i, the last column shows calculated values of (0, - E.)² E; Li fi (0,-E,)? E 110 115 1 0.077 115 120 4 4.336 120 125 49 6.673 125 130 35 0.784 130 135 15 0.722 135 140 4 ? 140 145 1
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