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Fourteen of 180 publicly traded business services companies failed a test for compliance with Sarbanes-Oxley requirements for financial records and fraud protection.
Assuming that these are a random sample of all publicly traded companies, construct a 95% confidence interval for the overall noncompliance proportion.
The 95% confidence interval
to
Find the p-value for each test statistic.
Test Statistic
p-value
(a) Right-tailed test
t = +1.677
n = 14
(b) Left-tailed test
t = -2.107
n = 5
(c) Two-tailed test
t = -1.865
n = 34
At the 0.05 level of significance, is there evidence of a significant relationship between the age groups and where people primarily get their news? If so explain the relationship.
The data in the scatterplot below are an individual's weight and the time it takes (in seconds) on a treadmill to raise his or her pulse rate to 140 beats per minute. The o's correspond to females and the +'s to males.
They wish to conduct a survey of their students and find a simple random sample of 50 Freshmen, 40 Sophomores, 35 Juniors, and 30 Seniors.
Determine the probability that their SAT scores will differ by more than 50 points?
A permutation resample for a two-sample test
A survey of college students collected information on several variables: Distance from Home, Age, Major, Gender, and Class. The variable Major is
Multiple comparison procedures are going to be done using the Bonferroni method with = 0.05. The value of t** is 2.4667. Which of the following is the appropriate conclusion from carrying out these multiple comparisons?
Let p represent the proportion of registered voters in the state that would vote for the Republican candidate. The standard error for the proportion of those who phoned in who answered "yes" is
The probabilities of low, medium and high compliance are 0.3, 0.4, and 0.3, respectively
Analysis of data sets assignment
In a distribution of scores, the arithmetic mean is 51, the median is 55, and the mode is 62. What is the score, in percentile form, of a subject who does less well than two-thirds of the sample?
A business owner decides to use a binomial distribution to solve one of his problems.
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