92%(102)94 out of 102 people found this document helpful
This preview shows page 16 - 20 out of 20 pages.
Both the critical value method and the p-value method lead to the same conclusion
Both the critical value method and the p-value method require computing the test statistic. Suppose that you wish to test H0: U=0 and you find that the z statistic associated with x is z= -2.88. Which alternative hypothesis would this z value support? U < 0The power of a statistical test is measured by 1-BUnder what circumstances do we reject a null hypothesis? When the data make a strong case that it is incorrect.When x s significantly greater than 100.ANSWER: LARGERANSWER: The power of a statistical test is defined as the probability of rejecting the null hypo when the null hypois false.Which of the following are NOT decisions we make when hypo testing? Accept the null hypo
Which of the following will help reduce the probability of committing a TYPE II error?Increase the sample sizeIncrease the probability of committing a Type I error.FALSE: The probability of a Type II error is the same for all possible values of U specified by the alternative hypothesis. TRUE:If the sample size is large, the T test is valid even if the sampled population is not normally distributed.KNOWLEDGE TEST:FALSE:The null hypothesis is a statement that will be accepted only if there is convincing sample evidence that it is true.It has been reported that the average time to download the home page from a government website was 0.9 seconds. Suppose that the download times were normally distributed with a standard deviation of 0.3 seconds. If random samples of 36 download times are selected, calculate the mean of the sampling distribution of the sampling mean. 0.9It has been reported that the average time to download the home page from a government website was 0.9 seconds. Suppose that the download times were normally distributed with a standard deviation of 0.3 seconds. If random samples of 23 download times are selected, describe the shape of the sampling distribution and how it was determined. normal; the original population is normalTRUE:If p = .8 and n = 50, then we can conclude that the sampling distribution of pˆ is approximately a normal distribution.A recent study conducted by the state government attempts to determine whether the voting public supports a further increase in cigarette taxes. The opinion poll recently sampled 1,500 voting age citizens. 1,020 of the sampled citizens were in favor of an increase in cigarette taxes. The state
government would like to decide if there is enough evidence to establish whether the proportion of citizens supporting an increase in cigarette taxes is significantly greater than .66. Identify the null hypothesis. p ≤ .66A(n) NULLhypothesis is the statement that is being tested. It usually represents the status quo, and it is not rejected unless there is convincing sample evidence that it is false.According to the Central Limit Theorem, if a sample size is at least 30,then for most sampled populations, we can conclude that the sample means are approximately normal.