issagirl05

24.04.2021 • 

Mathematics

Question 3 Juvenile ground squirrels respond to predators by making alarm calls that can alert others to danger. A biologist conducted a study to investigate how squirrels respond to these alarm calls: run
to burrow or freeze. The biologist played recordings of alarm calls for three samples of ground squirrels, grouped by age, and observed the squirrels' responses. The data for the three age levels
are shown in the table.
Run to Burrow
Freeze
Total
21
18
39
16
24
40
1 to 5 Days Old
6 to 15 Days Old
16 to Zs Days Old
Total
12
7
19
49
49
98
If ground squirrels at different ages respond to the alarm signals in the same proportions, what would be the expected count for 6-to 15-day-old squirrels that freeze?

Ответ:

dianaparra826

02.02.2022

Mathematics

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Step-by-step explanation:

Given that a soccer ball manufacturer wants to estimate the mean circumference of soccer balls within 0.1 inch.

a) sigma = 0.25

Since population std dev is known we can use Z critical value i.e. 2.58

Hence when sigma =0.25

we get n should be atleast = 41.6025 or 42

b) when sigma = 0.3 we get

n >59.390=60

c) Big std deviation requires larger sample size.

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