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A particular survey indicated that 81% of 16-to 25-year-olds had getting rich as a goal as compared to 62% of 26-to 35-year olds. Suppose that the survey was based on 300 respondents from each of the two groups. (a) What is the probability that a randomly selected respondent has a goal of getting rich? (b) Are the events "age group" and "has getting rich as a goal" independent? Explain.
In classical hypothesis testing, test statistic is to critical value what the?
The equation for the line of best fit is given as Y = 1.8x + 28.7, and the Pearson correlation coefficient was 0.61. Was the correlation coefficient significantly different from zero? Use α = 0.05.
In order to test to see if there is any significant difference in the mean number of units produced per week by each of three production methods, the following data were collected:
Given are five observations collected in a regretion study on two variables: What is the value of the standard error of the estimate?
The sample size n, the sample means, and the sample standard deviations for the two groups are given
Using the .05 level, do the results support the researcher's theory? (a) Use the steps of hypothesis testing, (b) sketch the distributions involved.
In a class, the grade of a student on an exam is an RV with expectation 60 and variance 16. If the class average is between 55 and 65, with a probability greater than or equal to 0.9, determine the number of students that have taken the exam.
Construct a 95% confidence intervalfor the population proportion of positive drug tests. Why is the normality assumption not a problem despite the very small value of p?
A teacher claims that the variance on a calculus test is 68. A sample of 28 students had a standard deviation of 5.8. Test the teacher's claim at the 0.05 level of significance.
The researcher computed the number of migraines individuals reported during a six-month time frame as a function of the amount of stress they reported during that same time period. There were three stress levels: low, mild, and severe.
What size sample would be required to estimate the proportion of unemployed college students if we want the margin of error not to exceed 3 percent?
At the 5 percent level of significance, can we conclude that the mean weight is greater than 16 ounces? Determine the p- value.
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