Question

SHORT ANSWER. Write the word or phrase that best comple tes each statement or answers the question. Use the given information to find the minimum sample size required to estimate an unknown population mean 7) Margin of error: $135, confidence level: 95%, σ-S500 MULTIPLE CH OICE. Choose the one alternative that best completes the statement or answers the question. Use the given degree of confidence and sample data to construct a confidence interval for the population mean μ Assume that the populatlon has a normal distribution. 8) Thirty randomly selected students took the calculus final. If the sample mean was 95 and the 8) standard deviation was 6.6, construct a 99% confidence interval for the mean score of all students. A) 91.68 < μ < 98.32 C) 92.95-με 97.05 B) 91.69 <H<98.31 D) 92.03 H< 97.97 Solve the problem. 9) Find the critical value χ R corresponding to a sample size of 19 and a confidence level of 99 9) percent. A) 34805 B) 37.156 C) 7.015 D) 6.265 Use the given degree of confidence and sample data to find a confidence interval for the population standard deviation σ Assume that the population has a normal distribution. Round the confidence interval limits to the same number of decimal places as the sample standard deviation. 10) To find the standard deviation of the diameter of wooden dowels, the manufacturer measures 19 10) randomly selected dowels and finds the standard deviation of the sample to bes 0.16. Find the 95% confidence interval for the population standard deviation c. B) 0.15-ơ < 0.21 C)0.11 σ 0.25 «o<025 D) 0.12 < σ < 024 A) 0.13 < σ < 0.22 SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. Express the null hypothesis and the alternative hypothesis in symbolic form. Use the correct symbol (u. p. a) for the indicated parameter 11) The manufacturer of a refrigerator system for beer kegs produces refrigerators that ane supposed to maintain a true mean temperature, H, of 48'F, ideal for a certain type of German pilsner. The owner of the brewery does not agree with the refrigerator manufacturer, and claims he can prove that the true mean temperature is incorrect 12) 12) A psychologist claims that more than 5.8 percent of the population suffers from professional problems due to extreme shyness. Use p, the true percentage of the population that suffers from extreme shyness

Answer 1

-2-75638 91.6786ースく a 3.321L ). 1.9上68 <从く一98.32