Reference no: EM132850347
Test a claim that the mean amount of carbon monoxide in the air in U.S. cities is less than 2.31 parts per million. It was found that the mean amount of carbon monoxide in the air for the random sample of 62 cities is 2.37 parts per million and the standard deviation is 2.12 parts per million. At α=0.01?, can the claim be? supported? Complete parts? (a) through? (e) below. Assume the population is normally distributed.
?(a) Identify the claim and state H0 and Ha. Which of the following correctly states H0 and Ha??
?(b) Use technology to find the critical? value(s) and identify the rejection? region(s).
The critical? value(s) is/are t0=
?(Use a comma to separate answers as needed. Round to two decimal places as? needed.)
(c)Find the standardized test? statistic, t. t=
(d)Decide whether to reject or fail to reject the null hypothesis.
The null hypothesis is rejected if the standardized test statistic is inside the rejection? region is =
Use this information to determine whether or not to reject the null hypothesis.
(e) Interpret the decision in the context of the original claim.
If the claim is the alternative hypothesis and H0 is? rejected, then there is enough evidence to support the claim.
If H0 is not? rejected, then there is not enough evidence to support the claim.