Chapter 9: Q.2.2 (page 539)
Describe a Type II error in this setting.
Short Answer
Type II error happens in the event that the null hypothesis isn't dismissed regardless of whether it isn't right.
Chapter 9: Q.2.2 (page 539)
Describe a Type II error in this setting.
Type II error happens in the event that the null hypothesis isn't dismissed regardless of whether it isn't right.
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Get started for freePaying high prices? A retailer entered into an exclusive agreement with a supplier who guaranteed to provide all products at competitive prices. The retailer eventually began to purchase supplies from other vendors who offered better prices. The original supplier filed a lawsuit claiming violation of the agreement. In defense, the retailer had an audit performed on a random sample of invoices. For each audited invoice, all purchases made from other suppliers were examined and compared with those offered by the original supplier. The percent of purchases on each invoice for which an alternative supplier offered a lower price than the original supplier was recorded.For example, a data value of means that the price would be lower with a different supplier for of the items on the invoice. A histogram and some computer output
for these data are shown below. Explain why we should not carry out a one-sample t-test in this setting.
The z statistic for a test of H0 :p = 0.4 versus Ha : p > 0.4 is z = 2.43. This test is
(a) not significant at either or .
(b) significant at but not at
(c) significant at but not at .
(d) significant at both and .
(e) inconclusive because we donโt know the value of หp .
The P-value for a two-sided test of the null hypothesis is
(a) Does theconfidence interval forinclude ? Why or why not?
(b) Does the confidence interval forinclude ? Why or why not
Attitudes The Survey of Study Habits and Attitudes (SSHA) is a psychological test that measures studentsโ attitudes toward school and study habits. Scores range from . The mean score for U.S. college students is about . A teacher suspects that
older students have better attitudes toward school. She gives the SSHA to an SRS of of the over students at her college who are at least years of age. Check the conditions for carrying out a significance test of the teacherโs suspicion.
Refer to Exercise 80. Construct and interpret a confidence interval for the population mean . What additional information does the confidence interval provide?
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