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skelet666 [1.2K]
4 years ago
6

Circle the best answer. The choice between a z-test and a t-test for a population mean depends primarily on: a. the sample size.

b. the level of significance. c. whether a one- or two-tailed test is indicated. d. whether the given standard deviation is from the population or the sample. e. a z-test should never be used. 3
Mathematics
1 answer:
lapo4ka [179]4 years ago
5 0

Answer:

a)The sample size

Step-by-step explanation:

t - student distribution should be used whe we are facing a Normal Distribution population andwhen a sample size n is below 30.

t- student distribution is also a associated to a bell shape but is more flat and the values are more spread, tails are much more wide.

t- student use the concept of degree of fredom ( each degree of fredom correspont to an specific curve). As degree of fredom increase the curves become more close to a bell shape. For  n = 30 t-student curve is  a bell shape one

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The mean of three number is 15. if 2 of the numbers are 18 and 16 what is the third number​
MrMuchimi

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11

Step-by-step explanation:

The mean is calculated as

mean = \frac{sum}{count}

let the third number be x , then

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a farmer sold 2/5 of his cows and another 10th was stolen he then gave 20% of the cows that was left what percentage of the cows
igor_vitrenko [27]

Answer:

4/5 of the cattle is left

Step-by-step explanation:

Given,

A farmer sells 2/5 of his cattle

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Hope this answer helps you :)

Have a great day

Mark brainliest

Thus 4/5 of the cattle is left

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