Answer to Question #188270 in Statistics and Probability for padma raga. A

Question #188270

A sample of 900 items is found to have a mean of 3.47 cm. Write down the R programming code to test whether it can be reasonably regarded as a simple sample from a population with mean 3.23 cm and SD 2.31 cm at 99% level of confidence.


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Expert's answer
2021-05-07T11:33:04-0400

H0:μ=3.23H1:μ3.23xˉ=3.47σ=2.31n=900H_0 : \mu = 3.23 \\ H_1 : \mu ≠ 3.23 \\ \bar{x} = 3.47 \\ \sigma = 2.31 \\ n = 900

The test statistic:

z=xˉμσ/nz=3.473.232.31/900z=3.11z = \frac{\bar{x} - \mu}{\sigma / \sqrt{n}} \\ z = \frac{3.47 -3.23}{2.31 / \sqrt{900}} \\ z = 3.11

R programming code:



Calculated z>zalphaz>z_{alpha} , so H0 is rejected.


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