Chapter 8 practices

Directions: (a) State the null and the alternate hypothesis. Identify the claim. [4] (b) Make a fully labeled diagram. Normal, Student t, or Chi-Square ?. [4] (c) Give the formula and compute the Test Statistic. [4] (d) State a conclusion using statistical language. [3] 1.) From long experience, a large company with branch offices in several countries has observed that employees move their families on the average of once every 8.50 years. In recent years, the trend has been that the employee family move time may have changed. Using results from a questionnaire of a random sample of 48 employees, from the entire company, it was discovered employees move every x = 7.91 years with a sample standard deviation of s = 3.62 years. At the a = 0.05 level of significance, does the sample evidence indicate that the employee family move time has changed? 2.) The population distribution of the hemoglobin count HC for adults (in grams per 100 milliliters of whole blood) is approximately normal with a population mean of 14 g/ml. A healthy adult patient has taken 12 laboratory blood tests during the past year. Adult patient laboratory HC test results: 19 23 15 21 18 16 14 20 19 16 18 21 [Using your calculator]: x =_ and s =_ (rounded to nearest hundredth) At the a = 0.01 level of significance, do the laboratory tests indicate the HC level for this patient is higher than 14 g/ml