Chapter 5.1, Problem 42E

Total blood volume (in ml) per body weight (in kg) is important in medical research. For healthy adults, the red blood cell volume mean is about μ = 28 ml/kg.† Red blood cell volume that is too low or too high can indicate a medical problem. Suppose that Roger has had seven blood tests, and the red blood cell volumes were as follows.32 25 41 35 30 37 29 The sample mean is x ≈ 32.7 ml/kg. Let x be a random variable that represents Roger's red blood cell volume. Assume that x has a normal distribution and σ = 4.75. Do the data indicate that Roger's red blood cell volume is different (either way) from μ = 28 ml/kg? Use a 0.01 level of significance. a) What is the level of Significance? State the null and alternate hypothesis. Will you use a left-tailed, right-tailed, or two-tailed test? b) What sampling distribution will you use? Explain the rationale for your choice of sampling distribution. What is the value of the sample test statistic? c)Find (or estimate) the P-value. Sketch the…

Total blood volume (in ml) per body weight (in kg) is important in medical research. For healthy adults, the red blood cell volume mean is about μ = 28 ml/kg.† Red blood cell volume that is too low or too high can indicate a medical problem. Suppose that Roger has had seven blood tests, and the red blood cell volumes were as follows. 30 26 42 36 32 39 29 The sample mean is x ≈ 33.4 ml/kg. Let x be a random variable that represents Roger's red blood cell volume. Assume that x has a normal distribution and σ = 4.75. Do the data indicate that Roger's red blood cell volume is different (either way) from μ = 28 ml/kg? Use a 0.01 level of significance. (a) What is the level of significance?Compute the z value of the sample test statistic. (Round your answer to two decimal places.) (c) Find (or estimate) the P-value. (Round your answer to four decimal places.)

55. Explain from the data given below whether A and B are independent. positively associated or negatively associated : N=10,000, (A) = 4500, (B) = 6000, (AB) = 3150. () (A) = 150, (a) = 250, (B) = 20o, (aB) = 125. %3D %3D %3D

11. This scatterplot could show the relationship between which two variables? A. speed of an airplane (x) vs. distance traveled in one hour (y) B. outside air temperature (x) vs. air conditioning costs (y) C. age of an adult (x) vs. height of an adult (y) D. distance traveled (x) vs. gas remaining in the tank (y)

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These box plots show the number of dogs at two different dog parks at the beginning of each hour recorded over one week. Dog Park A Dog Park B +++ + 13 14 15 16 17 18 19 20 21 22 23 24 25 26 Number of Dogs Which statement is true based on this data? А. The range for dog park B is less than the range for dog park A. В. The highest value for dog park B is less than the highest value for dog park A. С. The median for dog park B is greater than the median for dog park A. D. The interquartile range for dog park B is less than the interquartile range for dog park A.

Mark the critical points (z values) with their corresponding y values as points on the following graph. 54 48- 42 36 30 24 18 12 6- Clear All Draw: Dot

2. Is there an association between square footage and asking price? Describe the association in terms of direction , form , and strength in context .

Total blood volume (in ml) per body weight (in kg) is important in medical research. For healthy adults, the red blood cell volume mean is about μ = 28 ml/kg.† Red blood cell volume that is too low or too high can indicate a medical problem. Suppose that Roger has had seven blood tests, and the red blood cell volumes were as follows. 30 25 43 34 32 39 28 The sample mean is x ≈ 33.0 ml/kg. Let x be a random variable that represents Roger's red blood cell volume. Assume that x has a normal distribution and σ = 4.75. Do the data indicate that Roger's red blood cell volume is different (either way) from μ = 28 ml/kg? Use a 0.01 level of significance. (a) What is the level of significance? State the null and alternate hypotheses. Will you use a left-tailed, right-tailed, or two-tailed test? H0: μ = 28 ml/kg; H1: μ ≠ 28 ml/kg; two-tailedH0: μ = 28 ml/kg; H1: μ > 28 ml/kg; right-tailed    H0: μ = 28 ml/kg; H1: μ < 28 ml/kg; left-tailedH0: μ ≠ 28 ml/kg; H1: μ = 28 ml/kg;…