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yoojayypee1236
18.12.2019 •
Mathematics
The data below refers to the time in hours spent on mobile internet by sample of 10 students in a class. 39 42 47 45 32 45 37 34 33 29 assume that the population data follows a normal distribution with unknown mean and unknown standard deviation. find a 95% confidence interval estimate of μ . [33.813, 42.787] hours [35.557, 41.936] hours [34.664, 41.936] hours
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Ответ:
Option A) (33.813,42.787)
Step-by-step explanation:
We are given the following data set:
39, 42, 47, 45, 32, 45, 37, 34, 33, 29
Sample size, n = 10
Formula:
where
are data points,
is the mean and n is the number of observations.
Sum of squares of differences = 354.1
95% Confidence interval:
Putting the values, we get,
Ответ:
X= cones; y= sundaes
1.10x + 2.35y = 294.20 (i)
x + y = 172 (ii)
from (ii) x= 172-y
1.10(172-y) + 2.35y = 294.2
189.2 – 1.1y + 2.35y = 294.20
1.25y = 105
y = 84 sundaes