165. In a study of the use of ultrasonography for the early detection of prostate cancer, 35 of 50 men with prostate cancer have abnormal test results, and 20 of 100 men without prostate cancer have abnormal test results. Which of the following is the specificity of this test? A) 20% B) 30% C) 50% D) 70% E) 80%

165. In a study of the use of ultrasonography for the early detection of prostate cancer, 35 of 50 men with prostate cancer have abnormal test results, and 20 of 100 men without prostate cancer have abnormal test results. Which of the following is the specificity of this test? A) 20% B) 30% C) 50% D) 70% E) 80%

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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A researcher is interested in the effect of the pandemic on social media use among college students. The researcher hypothesizes that college students spend more time on social media thanthey did before the pandemic. To test his hypothesis, he randomly selected 50 college students and asked how many hours do they spend on social media per day before and after the pandemic. a) What is the research question? b) What is/are the variable(s)? What graphs can be used to display the variable(s) visually? c) What statistical test can be used to answer the research question?
question 17 an ANOVA is used to evaluate the difference among 2 treatment conditions with a sample of n=14 participants in each condition. for this research study, what is df- within? a) 1 b) 26 c) 2 d) 13
Males and females were asked what they would do if they received a $100 bill in the mail that was addressed to their neighbor, but had been incorrectly delivered to them. Of the 70 males sampled, 55 said yes they would return it to their neighbor. Of the 130 females sampled, 120 said yes. The overall question is: Is this sufficient evidence to say that the two true proportions are different? Assume that the p-value turns out to be .027 (again not the correct p-value for this situation but use it to answer this question). What is your decision on this hypothesis test using a 5% level of significance? O Fail to reject the null hypothesis Reject the null hypothesis
If you had an ANOVA with T1 = 5, T2 = 10, T3 = 15, with SS1 = 6, SS2 = 9, SS3 = 9, and ∑X2 = 94. If you were comparing 3 treatment groups with n = 5 in each group, what would SSwithin be? Group of answer choices 34 10 68 24
In an experiment with t = 4 population means and sample sizes of n1 = 5, n2 = 6, n3 = 4, and n4= 8, consider the four linear combinations of the sample means: ?̂1 = ?̅1 + 3?̅2 + ?̅3 + ?̅4?̂2 = ?̅1 + ?̅2 − 2?̅4?̂3 = ?̅1 + ?̅2 + ?̅3 + ?̅4?̂4 = ?̅1 + ?̅2 − 3?̅3 + ?̅4 a. Which of the four linear combinations are contrastsb. Which pairs of contrasts are orthogonal
In Mendel's experiment, he obtained 724 plants with red flowers and 210 with white flowers in his cross of red flowered x white flowered pea plants. Is this result consistent with his hypothesis of factor segregation? Calculate the x and obtain the approximate value of P from Table 1, then interpret the results and clearly state your conclusion. Table 1: Chi-square table Chi Square Values and Probability Degrees of Freedom P= 0.99 0.95 0.80 0.50 0.20 0.05 0.01 1 0.000157 0.00393 0.0642 0.455 1.642 3.841 6.635 2 0.020 0.103 0.446 1.386 3.219 5.991 9.210 3. 0.115 0.352 1.005 2.366 4.642 7.815 11.345 0.297 0.711 1.649 3.357 5.989 9.488 13.277
The single sample z test may be used to determine: a)the variability in the sample b)if a sample mean is different from a known population mean c)if two population means are different d)the variability in the population of sample means
The purpose of statistical process control is to ensure that output is random O a. True O b. False
The following table shows the systolic blood pressure of 5 certified public accountants before tax season and after tax season begins. Before 110 124 98 105 118 After 114 128 97 108 122 If you plan to test if there is a difference in their blood pressure, answer the following: Is this means or proportions? [ Select ] ["proportions", "means"] Is this one-sample, two-sample independent, or two sample matched-pairs(dependent)? [ Select ] ["two-sample independent", "two sample matched-pairs(dependent)", "one-sample"] Which distribution should you use? [ Select ] ["t", "z"] At the 5% significance level, what is the initial conclusion? [ Select ] ["reject Ho", "fail to reject Ho"] At the 1% significance level, what is the initial conclusion? [ Select ] ["reject Ho", "Fail to reject Ho"]