
Concept explainers
Please provide the following information for Problems 11-22.
(a) What is the level of significance? State the null and alternate hypotheses.
(b)Check Requirements What sampling distribution will you use? Explain the rationale for your choice of sampling distribution. Compute the appropriate sampling distribution value of the sample test statistic.
(c) Find (or estimate) the P-value. Sketch the sampling distribution and show the area corresponding to the P- value.
(d) Based on your answers in parts (a) to (c), will you reject or fail to reject the null hypothesis? Are the data statistically significant at level
(e)Interpret your conclusion in the context of the application.
Note: For degrees of freedom d.f. not given in the Student's t table, use the closest d.f. that is smaller. In some situations, this choice of d.f. may increase the P-value by a small amount and therefore produce a slightly more “conservative" answer.
Medical: Hemoglobin Count Let x be a random variable that represents hemoglobin count (HC) in grams per 100 milliliters of whole blood. Then x has a distribution that is approximately normal, with a population
15 | 18 | 16 | 19 | 14 | 12 | 14 | 17 | 15 | 11 |
Use a calculator with sample mean and sample standard deviation keys to verify that
ii.Does this information indicate that the population average HC for this patient is higher than 14? Use

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Chapter 9 Solutions
UNDERSTANDING BASIC STATISTICS (LOOSE)
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