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Statistics: Null and alternate hypotheses

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If given the following hypothesis:
Ho: the mean is less than or equal to 10
H1: the mean is greater than 10
For a random sample of 10 observations, the sample mean was 12 and the sample standard deviation 3. Using the .05 significance level:
1. State the decision rule.
2. Compute the value of the test statistic.
3. What would be the decision regarding the null hypothesis?

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Solution Summary

This solution provides explanations and calculations for a decision rules, test statistics, and decision regarding a null hypothesis.

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Null and alernate hypothesis If given the following hypothesis:
Ho: the mean is less than or equal to 10
H1: the mean is greater than 10
For a random sample of 10 observations, the sample mean was 12 and the sample ...

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  • BSc , Wuhan Univ. China
  • MA, Shandong Univ.
Recent Feedback
  • "Your solution, looks excellent. I recognize things from previous chapters. I have seen the standard deviation formula you used to get 5.154. I do understand the Central Limit Theorem needs the sample size (n) to be greater than 30, we have 100. I do understand the sample mean(s) of the population will follow a normal distribution, and that CLT states the sample mean of population is the population (mean), we have 143.74. But when and WHY do we use the standard deviation formula where you got 5.154. WHEN & Why use standard deviation of the sample mean. I don't understand, why don't we simply use the "100" I understand that standard deviation is the square root of variance. I do understand that the variance is the square of the differences of each sample data value minus the mean. But somehow, why not use 100, why use standard deviation of sample mean? Please help explain."
  • "excellent work"
  • "Thank you so much for all of your help!!! I will be posting another assignment. Please let me know (once posted), if the credits I'm offering is enough or you ! Thanks again!"
  • "Thank you"
  • "Thank you very much for your valuable time and assistance!"
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