A local veterinarian uses Z-scores to determine if newborn puppies of certain breeds are severely underweight, underweight, overweight, severely overweight, or within a typical weight range for their breed. Z-score Less than -3.0 Between -3.0 and -2.0 Between -2.0 and 2.0 Between 2.0 and 3.0 Greater than 3.0 Breed Siberian Husky Golden Retriever Chow Chow Shiba Inu Between Diagnosis Severely underweight Underweight Within the normal range Overweight Severely overweight Mean (pounds) Standard deviation (pounds) 2.5 2.1 2.4 1.2 (a) What values would be considered to be normal for a hypothetical Shiba Inu puppy? and 23.2 31.5 18.5 13.9 Report these answers to one decimal place (nearest tenth).

Insurance componies track life expertancy info to assist in determining the cost of life insurance polocies. The insurance compony knows that last year the life expectancy of its polocy holders was 77 years. They want to know if their clients this year have a longer life expectancy, on average, so the company randomy samples some of the recently paid polices to see if the mean life expectancy of polcy holders has increased.   Sample: 86,75, 83, 84, 81, 77, 78, 79, 79,81, 76, 85, 70,76, 79,81, 73, 74, 72, 83. 1) Does this sample indicate that the insurance company should change its premiums because life expectancy has increased?  2) For more accurate cost determination, the insurance companies want to estimate the life expectancy to within one year with 95% confidence. How many randomly selected records would you need to have?

Suppose that a certain paper included the accompanying data on the tar level of cigarettes smoked for a sample of male smokers who died of lung cancer. Tar Level Frequency Low 108 Medium 383 High 568 Very high 155 Assume that the sample is representative of male smokers who die of lung cancer. Calculate the value of the  ?2  test statistic that could be used to test whether the proportions of male smoker lung cancer deaths are not equal for all of the four tar level categories. The expected values are 303.5 for each of the four cells. (Round your answer to three decimal places.) ?2 =

When a person states at the outset of an experiment that a higher average score will be received by a group receiving some kind of treatment when it is compared to the mean of a group that did not receive the treatment, the need for a _________________ is apparent.  a. one-tailed test  b. two-tailed test  c. an independent groups test  d. a matched groups test