Case Study Chapter 6 1. A loggerhead sea turtle is classified as a juvenile if its shell length is less than 40 centimeters. How many of the turtles in the sample were juveniles? 2. Use the sample to make a point estimate of the mean shell length of all juvenile loggerhead sea turtles that drift from their hatching site to the coast of Britain. 3. Find the standard deviation of the sample of juveniles. 4. Use the sample to make an interval estimate of the mean shell length of juvenile loggerhead sea turtles that drift from their hatching site to the coast of Britain. (a) Use a 90% confidence level. (b) Use a 95% confidence level. (c) Use a 99% confidence level. 5. How would your results have differed if you had used all the turtles in the sample instead of just the juvenile turtles? Explain your reasoning. 6. Complete the following table Chapter 7 Case Study 1. Complete the hypothesis test for all adults (men and women) by performing the following steps. Use a level of significance of a = 0.05 2. If you lower the level of significance to α = 0.01, does your decision change? Explain your reasoning. 3. Test the hypothesis that the mean temperature of men is 98.6°F. What can you conclude at a level of significance of α = 0.01? 4. Test the hypothesis that the mean temperature of women is 98.6. What can you conclude at a level of significance of a=0.01? 5. Use the sample of 130 temperatures to form a 99% confidence interval for the mean body temperature of adult humans. 6. The conventional “normal”� body temperature was established by Carl Wunderlich over 100 years ago. What, in Wunderlich’s sampling procedure, do you think might have led him to an incorrect conclusion?
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