QUESTION 16 BONUS QUESTION worth 5 points! Chapter 8: Hypothesis testing. The AB

Question

QUESTION 16 BONUS QUESTION worth 5 points! Chapter 8: Hypothesis testing. The ABC Steel Company manufactures steel bars. When the production process is working correctly, it turns out steel bars with an average length of at least 2.8 feet with a standard deviation of 2 foot. Longer steel bars can be used or altered, but shorter bars must be scrapped. A sample of 25 bars is selected from the production line. The sample indicates an average length of 2.73 feet. The company wishes to determine if the production equipment needs an immédiate adjustment. The Null and Alternate hypothesis is O Null equal to 2.8 and Alternate not equal to 2.8 O Null greater than or equal to 2.8 and Alternate less than 2.8 O Null less than 2.8 and Alternate greater than or equal to 2.8 Null not equal to 2.8 and Alternate equal to 2.8 QUESTION 17 BONUS QUESTION worth 5 points! Chapter B: Hypothesis testing. The ABC Steel Company manufactures steel bars, When the production process is working correctly. it turns out steel bars with an average length of at least 2.8 feet with a standard deviation of 2 foot. Longer steel bars can be used or altered, but shorter bars must be scrapped. A sample of 25 bars is selected from the production line. The sample indicates an average length of 2.73 feet. The company wishes to determine if the production equipment needs an immediate adjustment. If the company uses a .05 level of significance, would you reject the null hypothesis using the critical value (2 value) approach to hypothesis testing? Yes No Maybe n Do Not Know

Explanation / Answer

Solution:-

16) option B. null greater than or equal to 2.8 and alternate less than 2.8

=> H0: mean >= 2.8
  
H1: mean < 2.8

17) option B. No

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