The Mean Annual Incomes of Certified Welders Are Normally Distributed

question 11

Multiple Choice

The mean annual incomes of certified welders are normally distributed with the mean of $50,000 and a population standard deviation of $2,000. The ship building association wishes to find out whether their welders earn more or less than $50,000 annually. A sample of 100 welders is taken and the mean annual income of the sample is $50,350. If the level of significance is 0.05,what conclusion should be drawn?

• A)Do not reject the null hypothesis as the test statistic is less than the critical value of z.
• B)Do not reject the null hypothesis as the test statistic is less than the critical value of t.
• C)Reject the null hypothesis as the test statistic is greater than the critical value of t.
• D)Reject the null hypothesis as the test statistic is greater than the critical value of z.

Explain the procedures and considerations involved in testing a promising option during decision-making.

Understand the ideological dilemmas and conflicts that motivated colonial resistance against British policies.

Recognize the economic and political reasons behind the imposition of various Acts by the British government and the colonial reactions to them.

Analyze the impact of British military actions and treaties on the dynamics between the colonists, Native Americans, and foreign powers.

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