In Exercises 9–20, assume that the paired sample data are simple random samples and that the differences have a distribution that is approximately normal.
18. Before/After Treatment Results Captopril is a drug designed to lower systolic blood pressure, when subjects were treated with this drug, their systolic blood pressure readings (in mm Hg) were measured before and after the drug was taken. Results arc given in the accompanying table (based on data from “Essential Hypertension: Effect of an Oral Inhibitor of Angiotensin-Convening Enzyme,” by MacGregor et al., British Medical Journal, Vol. 2). Using a 0.01 significance level, is there sufficient evidence to support the claim that Captopril is effective in lowering systolic blood pressure?
Subject | A | B | C | D | E | F | G | H | I | J | K | L |
Before | 200 | 174 | 198 | 170 | 179 | 182 | 193 | 209 | 185 | 155 | 169 | 210 |
After | 191 | 170 | 177 | 167 | 159 | 151 | 176 | 183 | 159 | 145 | 146 | 177 |
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Essentials of Statistics (5th Edition)
- Refer to the data presented in Exercise 2.86. Note that there were 50% more accidents in the 25 to less than 30 age group than in the 20 to less than 25 age group. Does this suggest that the older group of drivers in this city is more accident- prone than the younger group? What other explanation might account for the difference in accident rates?arrow_forwardPart 4 of 4 Summarize the results. There (Choose one) enough evidence to conclude that the second-graders in the superintendent's school district have h the nationwide average. differe is is notarrow_forwardcm ass 4 q2arrow_forward
- Suppose data is collected to predict y from x. If the size of Sample ✓ Calculate the p-value if the test statistic is t = -1.38arrow_forwardThank you 1 hour left!arrow_forwardHistorically, Olympic officials have reported testosterone levels in general should be u = 538 ng/dL, with o = 189, with x being normally distributed. Summer Olympic sprinters (n = 8) from the U.S. were tested for testosterone levels the morning after the opening ceremonies. Their sample mean was ng/dL. Do these data indicate that the sprinters had an overall average testosterone level greater than 538? Use a = .05. State a, H,, H1, p-value, rejection, or non-rejection, and be certain to interpret your results.arrow_forward
- 3. Find the 2-score of the following data: μ=77.1, 5.1, and x=841 => Z-score=arrow_forwardRefer to the data in images. Test for a significant difference in the variances of theinitial white blood cell count between patients who did andpatients who did not receive a bacterial culture.arrow_forwardWhat percent of the variability in the response variable is explained by the explanatory variable? Is the relationship between the two variables significant or not? Show your work.arrow_forward
- Use the t-test please.arrow_forwardA sample of blood pressure measurements is taken from a data set and those values (mm Hg) are listed below. The values are matched so that subjects each have systolic and diastolic measurements. Find the mean and median for each of the two samples and then compare the two sets of results. Are the measures of center the best statistics to use with these data? What else might be better? Systolic: 122 137 158 114 156 143 99 112 115 152 Diastolic: 61 51 76 73 55 58 74 60 87 59 Find the means. The mean for systolic is mm Hg and the mean for diastolic is mm Hg. (Type integers or decimals rounded to one decimal place as needed.) ***arrow_forwardPlease circle your answers. Thank you in advanced!arrow_forward
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw HillBig Ideas Math A Bridge To Success Algebra 1: Stu...AlgebraISBN:9781680331141Author:HOUGHTON MIFFLIN HARCOURTPublisher:Houghton Mifflin Harcourt