12.5 months. The children started wa 15 14

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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2. A psychologist claims that the mean age at which children start walking is
12.5 months. The following data give the age at which 18 randomly selected
children started walking.
15
14
14
15
15
11
17
13
13
12
14
16
11
16
15
15
10
13
Does the mean age at which children start walking is different from 12.5
months? Use 95% confidence level and assume that the population is normal.
Transcribed Image Text:2. A psychologist claims that the mean age at which children start walking is 12.5 months. The following data give the age at which 18 randomly selected children started walking. 15 14 14 15 15 11 17 13 13 12 14 16 11 16 15 15 10 13 Does the mean age at which children start walking is different from 12.5 months? Use 95% confidence level and assume that the population is normal.
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