In Exercises 5–20, assume that the two samples are independent simple random samples selected from
12. IQ and Load Exposure Data Set 7 “IQ and Lead” in Appendix B lists full IQ scores for a random sample of subjects with low lead levels in their blood and another random sample of subjects with high lead levels in their blood. The statistics are summarized below.
a. Use a 0.05 significance level to test the claim that the
b. Construct a confidence interval appropriate for tire hypothesis test in part (a).
c. Does exposure to lead appear to have an effect on IQ scores?
Low Blood Lead Level: n = 78,
High Blood Lead Level: n = 21,
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ELEMENTARY SATISTICS IA
- Section Exercise 9-33 (Static) Find the p-value using Excel (not Appendix D): (Round your answers to 4 decimal places.) p-value (a) Right-tailed test (b) Two-tailed test (c) Left-tailed test t = 1.457, d.f, = 14 t = 2.601, d.f. = 8 t=-1.847, d.f. = 22arrow_forwardplease solve question 21 and 23arrow_forwardI. 6) Suppose that you score 79 on Exam 3. If the average score is 85, and the variance is 23.04, your z-score is: a) 0.26 b) -0.26 c) 1.25 d) -1.25 e) -2.05arrow_forward
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- Q.1 Suppose samples are taken from a population of heifers with known mean and variance of weight gains of 188 lbs. and 2200 square lbs., respectively. a) What are the mean and the variance of an average weight gain estimated from a sample of 20 heifers? (188,110) b) What are the mean and variance from a sample of 30 heifers? (188, 73.3) c) How many heifers should be in a sample in order for the variance of sample means to equal 50? (44)arrow_forward3.24: The data in the accompanying table are from the Organization for Economic Co-operation and Development (data.oecd.org/eduatt/population-with-tertiary-education.htm, retrieved February 18, 2018). Entries in the table are the percentage of 25- to 34-year-old people who have completed a 4-year college degree for 27 countries in 2016. Country Percentage of people age 25 to 34 with 4-year degree Country Percentage of people age 25 to 34 with 4-year degree Australia 49.3 Italy 25.6 Austria 39.7 Japan 60.1 Canada 60.6 Mexico 21.8 Colombia 28.1 New Zealand 43.4 Costa Rica 28.9 Norway 48.6 Czech Republic 32.6 Poland 43.5 Denmark 45.9 Portugal 35.0 Finland 41.1 Spain 41.0 France 44.0 Sweden 47,.2 Germany 30.5 Switzerland 48.8 Greece 41.0 Turkey 30.5 Hungary 30.4 United Kingdom 52.0 Iceland 43.3 United States 47.5 Israel 47.4…arrow_forwardLet x be a random variable that represents blood glucose level after a 12-hour fast. Let y be a random variable representing blood glucose level 1 hour after drinking sugar water (after the 12-hour fast). Units are in milligrams per 10 milliliters (mg/10 ml). A random sample of eight adults gave the following information. I need help with Part A, B, and Carrow_forward
- 24. An automobile dealer conducted a test to determine if the time in minutes needed to complete a minor engine tune-up depends on whether a computerized engine analyzer or an electronic analyzer is used. Because tune-up time varies among compact, intermediate, and full-sized cars, the three types of cars were used as blocks in the experiment. The data obtained follow. Analyzer Computerized Electronic Compact Intermediate Full-sized 50 42 Car 55 44 63 46 Use a = .05 to test for any significant differences.arrow_forwardpleaseee sir solve question 22 and 23arrow_forward+ 十 6. 8. 6. 10 11 12 13 14 15 16 data Based on the boxplot above, identify the 5 number summary (min, Q1, median, Q3, max) IQR = %3Darrow_forward
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw Hill