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30.08.2020 •
Mathematics
A research scientist wants to know how many times per hour a certain strand of bacteria reproduces. The mean is found to be 13.6 reproductions and the population standard deviation is known to be 1.9. If a sample of 189 was used for the study, construct the 85% confidence interval for the true mean number of reproductions per hour for the bacteria. Round your answers to one decimal place.
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Ответ:
The confidence interval is![13.4< \mu < 13.8](/tpl/images/0734/4245/1953a.png)
Step-by-step explanation:
From the question we are told that
The sample mean is![\= x = 13.6](/tpl/images/0734/4245/89460.png)
The standard deviation is![\sigma = 1.9](/tpl/images/0734/4245/e271a.png)
The sample size is![n = 189](/tpl/images/0734/4245/38803.png)
given that the confidence level is 85% then the level of significance is mathematically represented as
Next we obtain the critical value of
from the normal distribution table the value is
Generally the margin of error is mathematically represented as
=>![E = 1.44* \frac{1.9}{\sqrt{189} }](/tpl/images/0734/4245/52777.png)
=>![E = 0.1990](/tpl/images/0734/4245/bdbb7.png)
The 85% confidence interval is mathematically represented as
=>![13.6- 0.1990 < \mu < 13.6+ 0.1990](/tpl/images/0734/4245/b42e9.png)
=>![13.4< \mu < 13.8](/tpl/images/0734/4245/1953a.png)
Ответ:
32.07
Step-by-step explanation:
12.88+44.95=
32.07