RADIATION IN BABY TEETH Listed below are amount of radioactive isotope strontium-90 (in millibequerels, or mBq per gram of Calcium) in a simple random sample of baby teeth obtained from Pennsylvania residents and New York residents after 1979. Pennsylvania 155 142 130 149 151 163 151 142 156 133 New York 133 140 142 131 134 129 128 140 140 140 Assume that amounts of radioactive isotope strontium-90 are normally distributed. Use a 0.01 significance level to test the claim that the amounts of strontium-90 from Pennsylvania residents are different than the amounts from New York residents. Use the following steps: Step 1. Write the Claim, Null Hypothesis and Alternative Hypothesis in symbols. Step 2. Identify a Step 3. Check and identify the requirements for this test. Step 4. State the test statistic and P-value (use Excel but do not round the results) Step 5. State your decision to either reject or fail to reject the null hypothesis and why.

RADIATION IN BABY TEETH Listed below are amount of radioactive isotope strontium-90 (in millibequerels, or mBq per gram of Calcium) in a simple random sample of baby teeth obtained from Pennsylvania residents and New York residents after 1979. Pennsylvania 155 142 130 149 151 163 151 142 156 133 New York 133 140 142 131 134 129 128 140 140 140 Assume that amounts of radioactive isotope strontium-90 are normally distributed. Use a 0.01 significance level to test the claim that the amounts of strontium-90 from Pennsylvania residents are different than the amounts from New York residents. Use the following steps: Step 1. Write the Claim, Null Hypothesis and Alternative Hypothesis in symbols. Step 2. Identify a Step 3. Check and identify the requirements for this test. Step 4. State the test statistic and P-value (use Excel but do not round the results) Step 5. State your decision to either reject or fail to reject the null hypothesis and why.

Name: POSITIVE z ScoresNEGATIVE z ScoresTABLE A-2 (continued) Cumulative Ar
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Description: POSITIVE z ScoresNEGATIVE z ScoresTABLE A-2 (continued) Cumulative Area from the LEFTTABLE A-2 Standard Normal (2) Distribution: Cumulative Area from the LEFT10 and2.575|る國器N西三 勇 RADIATION IN BABY TEETHListed below are amount of radioactive isotope

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Four laboratories are being used to perform chemical analyses. Samples of the same are sent to the laboratories for analysis as part of the study to determine whether or not they give, on the average, the same results. The analytical results for the 4 laboratories are as follows: use alpha = 0.01 ... A B 58 62 55 60 61 64 54 60 60 63 56 60 58 57 53 61 58 60 58 62 ANOVA TABLE: Fill in the missing values. (round off to two decimal places, #,###.##) Source of Sum of Squares df Mean Square Computed f f-Critical Variation Between Groups Blank 1 Blank 2 Blank 3 Blank 4 Blank 5 Within Groups Blank 6 Blank 7 Blank 8 Total Blank 9 Blank 10 Choose below the appropriate decision Blank 11 a The four laboratories give the same result b The four labaratories are not producing the same results. c Labs A and B are giving the same results. d none of the above
VI. ASSESSMENT/ACTIVITY Compute the z-value and state whether the z-score locates the raw score x within a sample or within a population 1. x = 50 S = 5 X = 40 2. x = 40 o = 8 u = 52 3. x = 36 S = 6 x = 18 4. x = 74 5. x = 82 S = 10 X = 60 o = 15 u = 75
3. Can SAT scores predict college performance? Let x be a variable that represents SAT score of a computer science major, and let y be a variable that represents a student’s GPA upon graduation. A random sample of n =15 computer science majors provided their SAT scores and GPAs: x 1232 1070 1086 1287 1130 1048 1121 1095 1135 1208 1333 1160 1186 1243 1261 y 3.52 2.91 2.4 3.47 3.47 2.37 2.4 2.24 3.02 3.32 3.59 2.54 3.19 3.71 3.58 The scatter diagram for the SAT score and GPA is given below: (a) Find the sample correlation coefficient r. Truncate to two decimal places. What does the value tell you about the data? (b) Find the equation of the least squares line . Truncate to four decimal places. What does the slope mean? (c) Find the value of the coefficient of determination . Truncate to two decimal places. What does this number mean? (d) What is the predicted GPA if a computer science major got a…
3.18. A manufacturer of television sets is interested in the effect on tube conductivity of four different types of coating for color picture tubes. A completely randomized experiment is conducted and the following conductivity data are obtained: Coating Type 1 234 2 4 143 152 134 129 Conductivity 150 137 132 132 141 149 136 127 146 143 127 129 (a) Is there a difference in conductivity due to coating type? Use a = 0.05. (b) Estimate the overall mean and the treatment effects. (c) Compute a 95 percent confidence interval estimate of the mean of coating type 4. Compute a 99 percent confidence interval estimate of the mean difference between coating types 1 and 4.
Women are recommended to consume 1790 calories per day. You suspect that the average calorie intake is smaller for women at your college. The data for the 15 women who participated in the study is shown below: 1959, 1908, 1789, 1544, 1805, 1656, 1899, 1811, 1686, 1688, 1687, 1943, 1612, 1789, 1467 Assuming that the distribution is normal, what can be concluded at the α = 0.05 level of significance? For this study, we should use The null and alternative hypotheses would be: H0: H1: The test statistic = (please show your answer to 3 decimal places.) The p-value = (Please show your answer to 4 decimal places.) The p-value is α Based on this, we should the null hypothesis. Thus, the final conclusion is that ... The data suggest the population mean is not significantly less than 1790 at α = 0.05, so there is sufficient evidence to conclude that the population mean calorie intake for women at your college is equal to 1790. The data suggest the populaton…
2. We would like to investigate the incidence of concussions among athletes. Samples of soccer players, non-soccer athletes, and non-athletes are collected. # of Concussions 0 1 2 ≥ 3 Soccer 45 25 11 10 N-S Athletes 68 15 8 5 Non-athletes 45 5 3 0 To see whether these three types of individuals have the same distribution, conduct a chi-square test of homogeneity at a = 5%. State (i) the degree of freedom, (ii) the expected frequency count of each cell and (iii) the conclusion of the test.
Use the following sample to evaluate H0: μ = 65, at significance level α = 0.05. 53 75 68 53 57 12 4 10 45 94 23 73 9 41 79 92 90 46 49 71 State the correct test and your conclusion. T-test. Reject Ho. T-test. Fail to reject Ho. Z-test. Fail to reject Ho. Z-test. Reject Ho.
The titanium content of steel is determined in two laboratories by means of atomic absorptionspectrometry. The following data were obtained: Lab 1 0.470 0.484 0.463 0.449 0.482 0.454 0.477 0.409 Lab 2 0.529 0.490 0.489 0.512 0.486 0.502 - - A. Determine the variance of the measurement data obtained in the two laboratories.B. Is there any significant difference between these variances?
9.15 HPV infections in women. Human papillomavirus (HPV) infection is the most common sexually transmitted infection. Certain types of HPV can cause genital warts in both men and women and cervical cancer in women. The U.S. National Health and Nutrition Examination Survey (NHANES) contacted a representative sample of 1921 women between the ages of 14 and 59 years and asked them to provide a self-collected vaginal swab specimen. Of these specimens, 515 tested positive for HPV, indicating a current HPV infection. a. Give the probability, risk, and odds that a randomly selected American woman between the ages of 14 and 59 years has a current HPV infection. b. The survey broke down the data by age group: Age group (years) 14–19 20-24 25–29 30–39 40-49 50–59 Percent HPV positive 24.5 44.8 27.4 27.5 25.2 19.6 Give the risk and the odds of being HPV positive for women in each age group. Which age group has the highest risk, and has the highest odds, of testing positive for HPV?
Contaminated water: Polychlorinated biphenyls (PCBS) are a group of synthetic oil-like chemicals that were at one time widely used as insulation in electrical equipment and were discharged into rivers. They were discovered to be a health hazard and were banned in the 1970s. Assume that water samples are being drawn from a river in order to estimate the PCB concentration. Suppose that a random sample of size 80 has a sample mean of 1.90 parts per billion (ppb). Assume the population standard deviation is o = 0.26 ppb. Part 1 of 3 ▬▬ esc (a) Construct a 98% confidence interval for the PCB concentration. Use tables or technology. Round your answers to at least two decimal places. The confidence interval is 1.83 1.97 Part 2 of 3 Skip Part Check Type here to search 12 2 # * 3 14 $ 4 D Et % 5 6 & 7 4+ Save For Later © 2023 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center 55°F 8 9 ho Submit. ► 11 d 1 3/
Dr. Maddan's eye drops are supposed to cause significant reduction is eye redness. The following table shows the results of a recent study where a random sample of individuals took part in a placebo controlled study. No Reduction in Redness Reduction in Redness Total Eye Drops 120 220 340 No Eye Drops Total 120 140 260 240 360 600 With 5% level of significance, determine if eye redness reduction is dependent upon taking the eye drops. Provide, a. the Chi-square statistic. b. the critical value or the p-value. c. Your decision on whether or not to reject Ho.
1.com Statistics students believe that the mean score on a first statistics test is 65. The instructor thinks that the mean score is higher. She samples 10 statistics students and obtains the scores: Grades 96 69 83.2 69 65 85.5 74.4 65 85.5 66.5 Test grades are believed to be normally distributed. Use a significance level of 5%. A. State the alternative hypothesis: H: Ομ 65 B. State the mean of the sample: 75.91 (Round to two decimal places.) C. State the standard error the sample means: 3.440 (Round to four decimal places.) D. State the test statistic: t = (Round to four decimal places.) E. State the p-value: (Round to four decimal places.) F. Decision: O Do not reject the null hypothesis. O Reject the null hypothesis.