Test a claim that the mean amount of carbon monoxide in the air in U.S. cities...

 

Transcribed Image Text:

Test a claim that the mean amount of carbon monoxide in the air in U.S. cities is less than 2.33 parts per million. It was found that the mean amount of carbon monoxide in the air for the random sample of 62 cities is 2.38 parts per million and the standard deviation is 2.09 parts per million. At a = 0.05, can the claim be supported? Complete parts (a) through (e) below. Assume the population is normally distributed. (a) Identify the claim and state Ho and Ha. Which of the following correctly states Ho and H? Ho: Ha: (Type integers or decimals. Do not round.) The claim is the hypothesis. (b) Use technology to find the critical value(s) and identify the rejection region(s). The critical value(s) is/are to =. (Use a comma to separate answers as needed. Round to two decimal places as needed.) Choose the graph which shows the rejection region. O A. В. OC. O D. t> to - to <t<to t< - to, t> to t<to 0 to - to 0 to -to 0 to (c) Find the standardized test statistic, t. The standardized test statistic is t=. (Round to two decimal places as needed.) (d) Decide whether to reject or fail to reject the null hypothesis. Ho because the standardized test statistic V in the rejection region. (e) Interpret the decision in the context of the original claim. There enough evidence at the % level of significance to V the claim that the mean amount of carbon monoxide in the air in U.S. cities is parts per million. (Type integers or decimals. Do not round.) Test a claim that the mean amount of carbon monoxide in the air in U.S. cities is less than 2.33 parts per million. It was found that the mean amount of carbon monoxide in the air for the random sample of 62 cities is 2.38 parts per million and the standard deviation is 2.09 parts per million. At a = 0.05, can the claim be supported? Complete parts (a) through (e) below. Assume the population is normally distributed. (a) Identify the claim and state Ho and Ha. Which of the following correctly states Ho and H? Ho: Ha: (Type integers or decimals. Do not round.) The claim is the hypothesis. (b) Use technology to find the critical value(s) and identify the rejection region(s). The critical value(s) is/are to =. (Use a comma to separate answers as needed. Round to two decimal places as needed.) Choose the graph which shows the rejection region. O A. В. OC. O D. t> to - to <t<to t< - to, t> to t<to 0 to - to 0 to -to 0 to (c) Find the standardized test statistic, t. The standardized test statistic is t=. (Round to two decimal places as needed.) (d) Decide whether to reject or fail to reject the null hypothesis. Ho because the standardized test statistic V in the rejection region. (e) Interpret the decision in the context of the original claim. There enough evidence at the % level of significance to V the claim that the mean amount of carbon monoxide in the air in U.S. cities is parts per million. (Type integers or decimals. Do not round.)