2. Engineer Salaries: Employees at a battery company claim that the mean salary of the company's mechanical engineers is less than that of one of its competitors, which is $90,000. A random sample of 20 of the company's mechanical engineers has a mean salary of $86, 900. Assume the population standard deviation is $5500, and that the population is normally distributed. At the 5% significance level, test the employees' claim. ONLY ANSWER THE QUESTIONS BELOW. DO NOT ACTUALLY GO THROUGH A FULL HYPOTHESIS TEST. (a) State the hypotheses. Ho H₁: (b) Find the critical value(s). Draw a picture and show all your work. (c) Describe a type II error for a hypothesis test of the above hypotheses. concluding: when in fact:

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2. **Engineer Salaries**: Employees at a battery company claim that the mean salary of the company’s mechanical engineers is less than that of one of its competitors, which is $90,000. A random sample of 20 of the company’s mechanical engineers has a mean salary of $86,900. Assume the population standard deviation is $5500, and that the population is normally distributed. At the 5% significance level, test the employees’ claim.

**ONLY ANSWER THE QUESTIONS BELOW. DO NOT ACTUALLY GO THROUGH A FULL HYPOTHESIS TEST.**

(a) State the hypotheses.
   
   \( H_0 \) :  
   
   \( H_1 \) :  

(b) Find the critical value(s). Draw a picture and show all your work.

(c) Describe a type II error for a hypothesis test of the above hypotheses.
   
   Concluding:  
   
   When in fact:

(d) Suppose that the null hypothesis was not rejected. State the conclusion.
Transcribed Image Text:2. **Engineer Salaries**: Employees at a battery company claim that the mean salary of the company’s mechanical engineers is less than that of one of its competitors, which is $90,000. A random sample of 20 of the company’s mechanical engineers has a mean salary of $86,900. Assume the population standard deviation is $5500, and that the population is normally distributed. At the 5% significance level, test the employees’ claim. **ONLY ANSWER THE QUESTIONS BELOW. DO NOT ACTUALLY GO THROUGH A FULL HYPOTHESIS TEST.** (a) State the hypotheses. \( H_0 \) : \( H_1 \) : (b) Find the critical value(s). Draw a picture and show all your work. (c) Describe a type II error for a hypothesis test of the above hypotheses. Concluding: When in fact: (d) Suppose that the null hypothesis was not rejected. State the conclusion.
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