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A student wanted to construct a 95% confidence interval for the average age of students in her statistics class. She randomly selected 9 students. Their average age was 19.1 years with a standard deviation of 1.5 years. What is the best point estimate for the population mean?
In a simple regression analysis, you notice that the R2 value is low (less than 0.4); however, the standard error is low. What does this tell you about the analysis?
10 cobalts are ramdomly selected and the miles per gallon for each car are recorded. What is the probability that the mean miles per gallon exceeds 34 miles per gallon?
At the .01 significance level, can we conclude that there is more variation?
You are assigned to be part of a team of three analysts of a global management consulting company where of the entire work force of analysts. 55% have had no experience in telecommunications
Find the test statistic P-value, and critical value, and state the final conclusion.
A survey of 300 union members in New York reveals that 112 favor the Republican candidate for governor. Construct the 98% confidence interval for the true population proportion of all New York State union members who favor the Republican candidate..
Morality Study for a group of four men, the probability distribution for the number x who live through the next year is as given in the accompanying table.
What characterizes a regular definition (dictionary) and an operational definition? What is the purpose of sampling?
In 2002 the Supreme Court ruled that schools could require random drug tests of students participating in competitive after-school activities such as athletics.
Computing the probability values using normal distribution - Evaluate the percentage of homes that generate between 27 and 31 pounds of recycling per month.
Describe your answer to a person who has never had a course in statistics.
Assume the researcher's rats can be considered an SRS from the population of all laboratory rats. The mean Math SAT score of these students is found to be 560, 80 points higher than the national average.
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