12. The internal auditing staff of a local manufacturing company performs a samp
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Question
12. The internal auditing staff of a local manufacturing company performs a sample audit quarter to estimate the proportion of accounts that are current (between billing). The historical records show that over the past 8 years 70 percent of the accounts have been current. Determine the sample size needed in order to be 95% confident that the sample proportion of the current customer accounts is within .03 of the true proportion of all accounts for this company. A. 1842 B. 1548 C. 897 D. 632 E. 1267 each 0 and 60 days after current Chapter 10 13. When testing a null hypothesis about a single population mean and the population standard deviation is unknown, if the sample size is less than 30, one compares the computed test statistic for significance with a value from the A. T B. Z C. Binomial D. Skewed distribution distribution. 14. For a given hypothesis test, if we do not reject Ho and Ho is false. A. No error has been committed B. Type I error has been committed C. Type II error has been committed D. TypeIlI eror has been commited be rejected at a 15. If a null hypothesis is rejected at a significance level of .05, it will significance level of.01 A. Always B. Sometimes C. NeverExplanation / Answer
15 )
we know that if p value < alpha , then we reject the null hypothesis
so if we reject at 0.05 alpha , then we may onyl sometimes reject the null hypothesis at 0.01 alpha. Because when p value is greater than 0.01 but less than 0.05 , then we reject null at 0.05 but fail to reject null at 0.01 .
however when p is less than 0.01 , then we reject null at 0.05 and at 0.01 , hence correct answer is B
14 )
Type 1 : reject null hypothesis, when we should not
Type 2 error is accept null hypothesis , when we should not
hence no error has been committed , hence A
13
when the sample size is less than 30 , we conduct a T test
if the sample size is greater than 30 then we can conduct a Z test
please note that we can answer only 1 question at a time, as per the answering guidelines
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