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alexandr402 [8]
2 years ago
7

What is the length of BC?

Mathematics
1 answer:
rewona [7]2 years ago
6 0

Answer:

There is no pic u might want to repost it^^

Step-by-step explanation:

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Researchers fed mice a specific amount of Toxaphene, a poisonous pesticide, and studied their nervous systems to find out why To
Mkey [24]

Answer:

a. The mean refractory period= 1.85 and the standard error = 0.06455

b.  90% confidence interval for the mean absolute refractory period for all mice when subjected to the same treatment = 1.6981, 2.0019

c. Yes, the data give good evidence to support this theory

Step-by-step explanation:

a.  The table below shows the calculations:

                 X                (X-mean)^2

                1.7             0.0225

                1.8                 0.0025

                1.9                 0.0025

                2.0                 0.0225

Total        7.4                  0.05

Sample size: n=4

The mean is:  \bar{x} = \frac{7.4}{4} = 1.85

The sample standard deviation, s = \sqrt{\frac{\sum \left ( x-\bar{x} \right )^{2}}{n-1}}=0.1291

The standard error, se= \frac{s}{\sqrt{n}}=\frac{0.1291}{2} = 0.06455

b. Degree of freedom: df = n-1 = 3

Critical value of t for 90% confidence interval is: 2.3534

The confidence interval is  \bar{x}\pm t_{c}se = 1.85\pm 2.3534\cdot 0.06455=1.85\pm 0.1519 = (1.6981, 2.0019)

c. The Hypotheses are:

H_{0}:\mu=1.3,H_{1}:\mu>1.3

So the test statistics will be

t=\frac{\bar{x}-\mu}{s/\sqrt{n}}=8.52

The p-value is: 0.0017

We reject the null hypothesis because p-value is less than 0.05 . This indicates that the data gave good evidence to support this theory.

4 0
3 years ago
Pentagon ABCDE is dilated according to the rule DO,3(x,y) to create the image pentagon A'B'C'D'E', which is shown on the graph.
myrzilka [38]

Answer:

5

Step-by-step explanation:

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3 years ago
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8 5 8 5 hopefully its right i'm not good at this kind of stiff
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3 years ago
6 lb 4 oz − 5 lb 10 oz =
FinnZ [79.3K]
The answer to your problem is 10 oz
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3 years ago
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What is the absolute value of the square root of 5 minus 5?
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-2.7639320225 is the exact when estimated -3 hope this helped if can pls mark as brainliest have a great day!

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