Answer: The point estimate for the mean weight of all spawning Chinook salmon in the Columbia River is the mean weight from your sample = 31.2 pounds .
Step-by-step explanation:
The weights of spawning Chinook salmon in the Columbia river are normally distributed.
Given : The mean weight from your sample is 31.2 pounds with a standard deviation of 4.4 pounds.
The point estimate for the mean weight of all spawning Chinook salmon in the Columbia River is the mean weight from your sample i.e. is 31.2 pounds because the best point estimate for population mean is the sample mean. [in normal distribution]
C loser that’s the correct number
Answer:
4 is a rational number
Step-by-step explanation:
rational numbers are numbers that can be divided by 2 and itself
The positive value of Z is 2.17.
What do you mean by normal distribution?
A data collection with a normal distribution is put up so that the majority of the values cluster in the middle of the range and the remaining values taper off symmetrically in either direction. Because of its flared appearance, a normal distribution's graphic representation is occasionally referred to as a bell curve. The specific shape may change depending on how the population is distributed, but the peak and curve are always symmetrical and in the centre.
The information can be represented in the standard normal curve below:
It is given that 97% of the standard normal curve lies between −z and z.
The area in between is 0.97 meaning that one side is (0.97)/2 = 0.485
In addition, the region not shaded is the level of significance represented by (1-0.97)/2 = 0.03/2 = 0.015
From the Z-Score table (0 to Z table), this probability corresponds to the Z value of Z= 2.17 and -2.17
Thus the positive value of Z is 2.17.
To learn more about the normal distribution from the given link.
brainly.com/question/27275125
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